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  • 1.
    Abed, Ahmed Ghafel
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Energieffektivisering vid renovering av Lamellhus på Mariehemsvägen2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In Sweden more houses than ever before are being built, and the house production is moving forward. At the same time, awareness of the energy use of buildings and its accompanying impacts on climate and sustainability are increasing. Therefore, Boverket constantly raises the demands for the energy performance of newly built and refurbished buildings.

    According to current requirements from Boverket (BBR, 2017), the primary energy value for apartment buildings may not be more than 85 kWh per square meter of tempered floor space and year. This also applies according to future requirements in 2021, but with the difference that the average U-value will decrease from 0.4 to 0.35 W/m2 K which means that apartment buildings must be built in an efficient way to reduce energy use. A large part of new construction and newly refurbished apartment buildings must then implement energy efficiency measures on their buildings to meet future requirements.

    This degree project has been carried out in collaboration with Rikshem AB who wants to investigate the impact of various energy efficiency measures on their apartment building ”Lamellhus”. The aim is to theoretically reduce apartment buildings ”Lamellhusets” specific energy use from 187,4 to 70 kWh/m2 Atemp, year and thus reduce the primary energy enough to meet future requirements according to BBR near-zero energy building.

    To theoretically reduce specific energy use and thus primary energy value, the project through manual calculations and with the help of computer tools examined various energy efficiency measures on the building's construction and installation system.

    The results show that the measures on the property climate shell are sufficient to meet the requirements. If all the measures according to package 1 or 2 on the design are combined, specific energy use according to BBR 16 (2010) will be at 83-94 kWh/m2 Atemp, year and the primary energy value according to BBR 25 (2017) will be at 68-77 kWh/m2 Atemp, year.

    The results also show how much of a building's energy use is ventilated. Replacing the ventilation system from F-systems to FTX-systems on the reference house in the base case, is the measure that gives one of the greatest impacts with a heat saving of (25.5-26.7%). In combination FTX-system with district heating, specific energy consumption can be reduced as low as possible. If the operation with the FTX-system is applied together with the existing district heating and all measures on the construction according to package 1 or 2, this gives a reduction of approximately (70-75 %) compared to the base case corresponding to 42-51 kWh/m2 Atemp, year according to BBR 16 and according to BBR 25, the figures are even lower. If the calculation considers thermal bridges and air leakage in the house, the result will increase.

    The results also show that the investment repays itself after 15-16 years with a simplified payback. With a calculation rate of 5 %, it is profitable over 30-31 years or more, but with a calculation rate of 8 % it is not profitable.

  • 2.
    Al-Doori, Mustafa
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Synergisystem inom NCC2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis, a study has been carried out in conjunction with NCC Construction AB in Umeå. The study is about a working environment reporting system called Synergi. The purpose of this study is to make the system known and useful among staff who work with and for NCC, and to explore the problems and weaknesses that should be addressed. The goal of the study is to find improvement opportunities to facilitate system use. This helps the system to be useful, which in turn will reduce incidents by registering and systematizing all incidents, accidents and observations. The results of the interviews show, that in addition to the benefits, there are drawbacks and weaknesses in the system that should be addressed. Examples of these drawbacks and weaknesses are that the system is not known among NCC staff, and certain structural and functional problems. Once the case registration has been started, the cace can not be saved to be finished later. Some fields are unimportant or can be presented in a better way, and that access to cases that were reported are complicated. Suggestions for improvement recommendations are introductory lectures. They should be given until all staff begin to know and apply the system. In addition, structural and functional problems should be addressed, such as access to the cases that were reported will be easier to find by putting quick link to the home page. Status bar at the case registration is irrelevant. The field to the notification to the social insurance and AFA should be changed to a checklist choice, instead of the current form. It is also recommended that the case registration should be transfered to a person who will be responsible for Synergis case registreirng. It helps officials in the workplace to save time.

  • 3.
    Allard, Ingrid
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Achieving building energy performance: requirements and evaluation methods for residential buildings in Sweden, Norway, and Finland2015Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Building energy performance has always been important in the cold climate of Sweden, Norway and Finland. To meet the goal that all new buildings should be nearly zero-energy buildings by 2020, set in the EU directive 2010/31/EU [1] on the energy performance of buildings (EPBD recast), the building sector in Europe now faces a transition towards buildings with improved energy performance. In such a transition, a discussion is needed about the objective of the improvement – why, or to what end, the building energy performance should be improved. The objective of improving building energy performance is often a political decision, but scientific research can contribute with knowledge on how the objectives can be achieved.

    This thesis addresses how the indicators used in the requirements used to achieve building energy performance in Sweden, Norway, and Finland, and the methods used to evaluate these requirements, reflect building energy performance. It also addresses difficulties in achieving comparable and verifiable indicators in evaluations of building energy performance. The research objective has two parts: to review, compare, and discuss (i) requirements and (ii) evaluation methods used to achieve energy performance of residential buildings in Sweden, Norway and Finland. The work in this thesis includes reviews of the requirements used in national building codes and passive house criteria to achieve building energy performance, of methods used to evaluate compliance with such requirements, and of methods used specifically to evaluate the indicator Envelope Air Tightness.

    The results show that different sets of indicators are used to achieve building energy performance in the studied building codes and passive house criteria. The methods used to evaluate compliance with requirements used to achieve building energy performance are also different, but calculation methods are generally more often used than measurement methods. The calculation- and measurement methods used are often simple. A methodology to analyze the deviation between predictions- and measurements of building energy performance (the performance gap) was developed, to investigate the effects of different evaluation methods on different indicators used to achieve building energy performance. The methodology was tested in a case-study. This study indicated that the choice of method affects which parts of the performance gap reflected in the indicators Supplied Energy (see Terminology), Net Energy (see Terminology), and Overall U-value. Among the reviewed methods to evaluate air tightness, the Fan/Blower Door Pressurization is well known and preferred by professionals in the field. The results in this thesis may be useful when choosing indicators and evaluation methods to achieve different objectives of improving building energy performance and in the quest towards comparable and verifiable indicators used to achieve building energy performance.

  • 4.
    Allard, Ingrid
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Hassan, Osama
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Energy evaluation methods for  residential buildings in Nordic countries2012In: Proceeding of the Technoport Conference, Elsevier, 2012Conference paper (Refereed)
    Abstract [en]

    To meet the goals of the directive 2010/31/EU on the energy performance of buildings, the building sector in Europe now faces a transition towards more energy efficient buildings. Research and development of new energy solutions and technology will be necessary for the transition and the importance of measuring and evaluating building energy performance increases. This paper attempts to review and evaluate different methods that are commonly used to analyze energy performance in residential buildings in Nordic countries, primarily in Sweden, Norway and Finland. A short international review of regulations is also included. Some advantages and disadvantages of each method are discussed, as well as commonly used methods in the three countries. Although the three Nordic countries have similar climate conditions and building traditions, the study shows that there exist relatively large variations in defining parameters related to energy performance in residential buildings, such as energy use, heated area, and climate zones. The outcome of the regulations could be investigated by adapting the codes on a selected set of buildings. Common analyzing methods, or parts of methods, are found to be used in several countries. These aspects may be considered in further work to develop more accurate and easily comparable methods to evaluate energy performance for residential buildings in cold climate.

  • 5.
    Allard, Ingrid
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Hassan, Osama
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Methods for air tightness analysis for residential buildings in Nordic countries2012In: Methods for air tightness analysis forresidential buildings in Nordic countries, Southampton: WIT Press, 2012, p. 311-322Conference paper (Refereed)
    Abstract [en]

    Envelope air tightness is one factor that has impact on the energy performance ofbuildings. The goals of the directive 2010/31/EU, on energy performance ofbuildings, raise the importance of building energy performance analysis in theprocess. Measurements of air tightness can be useful both when evaluatingbuilding energy performance and developing new building techniques. The aimof this paper is to review and evaluate methods to measure air tightness in bothnew and existing residential buildings in Sweden, Norway and Finland, based onan international literature study and a survey. The methods are categorized basedon a number of criteria to determine their suitability in different situations.Advantages and disadvantages of the methods are discussed, as well ascommonly used methods in the three countries. The review shows that thestandard ISO 9972 is used for verification in all three countries, but alternativesexist that might be more suitable in certain situations. Simpler methods are usedin the building process to increase air tightness. To achieve a comparablemeasurement, both common methods and commonly defined units are needed.

  • 6.
    Allard, Ingrid
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Hassan, Osama A. B.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Methods for energy analysis of residential buildings in Nordic countries2013In: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 22, p. 306-318Article, review/survey (Refereed)
    Abstract [en]

    To meet the goals of the directive 2010/31/EU on the energy performance of buildings, the building sector in Europe now faces a transition towards more energy efficient buildings. Research and development of new energy solutions and technology will be necessary for the transition and the importance of analyzing building energy performance increases. This paper aims to review and evaluate different methods that are commonly used to analyze energy performance in residential buildings in Nordic countries, primarily in Sweden, Norway and Finland. A short international review of regulations is also included. The goal is to find commonly used methods and possibilities for the future. The introduced methods are summarized, categorized and compared based on their advantages and disadvantages. Although the three Nordic countries have similar climate conditions and building traditions, the review shows relatively large variations in the definitions of energy performance for residential buildings, as well as variations in how measurements and calculations are used in the methods for energy performance analysis. In the conducted review, methods, or parts of methods, are also found to be used. The methods used to analyze energy performance are found to be more similar than the concepts of energy performance itself in the three countries. These aspects may be considered in further work to develop an international policy practice for energy performance of residential buildings in cold climate.

  • 7.
    Allard, Ingrid
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Östin, Ronny
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    A methodology to investigate the building energy performance gap2015In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118Article in journal (Other academic)
    Abstract [en]

    In order to evaluate compliance with requirements on building energy performance, it is necessary to find strategies to process discrepancies from the results of forward simulations in the design stage and of measurements in the operated stage. The gap between designed performance and measured performance is referred to as the “performance gap”. It can be divided into a procurement gap (between intended design and verified performance) and an operational gap (between verified performance and non-normalized measurements).  

    In this work we introduced a methodology for performance gap analysis, based on separating the procurement- and operational gap. An important component to do this is calibrations of calculations using measured data. The suggested methodology allows for more detailed verifications of building energy performance and can be used to study how indicators reflect the performance gap. The proposed methodology is tested using data from a well-documented and measured operated single family building, in sub-arctic climate in Sweden.

    The indicators studied in the verification were carefully analyzed. The methodology was found reliable based on the obtained results and a sensitivity analysis. An overall observation is that the applicability of the methodology depends on the accuracy of the hybrid method. The accuracy of the performance gap analysis per definition depends on the available information of the operated building, and consequently to access to extensive measured data.

  • 8.
    Ambertsson, Birger
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Stabilisering av lätta trähus2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Med Tommy Persson kvalitets- och produktchef vid Masonite Beams AB i Rundvik diskuterades problemet kring infästning av väggelement med hög färdighetsgrad till grunden. Det bestämdes att arbetet skulle fokusera på en- och tvåbostadshus och att endast fenomenet stjälpning skulle beaktas.

    Lastfördelningen gjordes enligt vad Klas Nyman skrivit i sitt examensarbete Tredimensionella effekter vid horisontalstabilisering av volymbyggda trähus. Beräkningar av lyftkraft gjordes enligt den plastiska metoden med syllen förankrad mot lyft medan frontregeln inte är förankrad mot lyftning som Bo Källsner och Ulf Arne Girhammar beskriver i sin bok Horisontalstabilisering av träregelstommar. För beräkning av skruvars bärförmåga tillämpades Eurokod 5. För beräkning av 5-percentilsvärden från provning tillämpades SS-EN 14358:2006 Träkonstruktioner.

    Resultat; de två studerade fästmetodernas dimensionerande bärförmåga är 1.61 kN och 1,23 kN, lyftkraften i syllen är i storleksordningen 3-19 kN/m.

    Rapporten kan ses som en fingervisning på hur stora lyftkrafter som uppstår i syllen när det blåser och ett alternativ på hur man ska beräkna dessa lyftkrafter. Med mer tid skulle en bättre infästning av väggelement till grunden kunna utformas.

  • 9.
    Andersson, Christer
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Verifiering av objektsbaserade 3D-modeller.: En fallstudie av arkitektmodell upprättat av Link Arkitektur med avseende på kvalitetssäkring i Solibri Model Checker inför import i IDA ICE.2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Export and import of BIM-models via IFC has in some cases shown to be problematic regarding ability to carry nessicary information such as for exampel geometry between different application. Good IFC-models is said to be the answer when it comes to creating a good informationflow in the construcion-sector, but seems to fail alot of the times today. This problem can be deived to lack of knowlege how IFC-models needs to be created in order to fulfill a specific purpose. This report preforms a quality controll of a existing IFC-model created at Link Architecture in Umeå, in order to be importabel in IDA ICE, and gives a detailed describtion of how its done. The control is done using Solibri Model Checker and the resaults of the test shows that there are some major innacuracies in the model that makes it not importable in IDA ICE. This report establish the fact that it might be important to preform continius controls of througout a BIM-project in order to avoid misstakes during the modelling-process.

  • 10.
    Andersson, Marcus
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Erfarenhetsåterföring på NCC i Umeå2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Successful experience feedback is not common among constructing entrepreneurs since it is hard to practice. NCC in Umeå is one of many constructing entrepreneurs that consider themselves to be poor in this field, which is the reason why they requested a study to be carried out in their organisation. The goal is, inter alia, to identify the current situation. This in order to clarify the attitude towards experience feedback within the organisation. The study leads to a suggestion of how NCC should work with experience feedback in the future, in order to improve it.

     

    A literature study was made with the purpose of gathering enough knowledge, for example about experience feedback, quality and constant improvement. This theory is the foundation on which the further parts of the study rests; the interviews and observations within the company. These interviews and observations aims towards creating an overall picture of the current situation in the company. Moreover they generate primary data on how the organisation wishes to work in order to improve experience feedback. The result of the interviews and observations are analysed together with the theory as reference. This leads to the conclusions which are drawn about how NCC can improve their experience feedback.

     

    The lack of prioritise of experience feedback is the major contributory factor to why experience feedback does not function in the current situation. This since the board have an absence of engagement on the field. Therefore, the needed time for reflection and analysis after a finished project is not given. Another important reason to why the organisation finds experience feedback difficult is the lack of a functioning system of documentation.

     

    In the future, NCC should allocate the time required for a successful work with experience feedback. The board should become more active in this matter and look upon this work as an investment, since it can increase the effectivity in the organisation and reduce the quality deficiency. One person in each project should be in charge of compiling and documenting experiences. These experiences then needs to be labelled and documented in a digital database in order to enable an easy search. These documents should content a summary of the project, protocols from the final meetings, contact lists over the staff involved and a key figure with the sum of all costs from the calculation. Moreover, a compilation with pictures and explanting texts from each part of the building is recommended. This since visualisation was described as an important tool for experience feedback during the study. 

  • 11.
    Andersson, Pär
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Frakt-och paketritning för KL-trä i Tekla2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this project has been to set up a freight drawing with accompanying packages drawing for CLT-wood in the program Tekla. This is based on the requirements for freight according to the Transport Agency and what applies to handling of the CLT boards regarding the working environment hazards. Based on the problems and requests from Martinsons, this project resulted in a freight drawing with accompanying package drawing. The package drawing is going to be a helpful tool for the project manager in the manufacture of the CLT boards. The freight drawing is going to provide comprehensive information about how to load the packages on the loading platform.

    The project is based on a reference model called Tallbocken, which is the model that Martinsons have used before. The model is basically a building, four floors tall, made almost entirely of CLT wood. An instruction has been made, based on this model, for the establishment of freight- and package drawing. A study has been made to ensure the demands from the Transport Agency regarding the shipping of compound elements. By visiting the production line in Bygdsiljum it was clear that the staff wanted a change in how to handle the CLT boards. Information about how to handle this was also an important message on meetings with the project manager and the production staff at the fabric in Bygdsiljum. To make sure that the drawings keep in line with the recommendations, there is an explanation for the review of building documents 90’s.

    This working project has resulted in an instruction for how to manage the establishing of freight- and package drawing. The instruction is attached as a supplement to this essay. This instruction explains the procedure step by step for how to create a freight drawing for CLT wood in Tekla structures by using a complete project template. 

  • 12.
    Andersson, Tomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Optimering av balkonglösning2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This dissertation describes the theory behind a specific solution for balcony attachment for concrete constructions designed by Prefabmästarna. The purpose is to get a deeper understanding of design according to Eurocode and EKS (Swedish application of eurocode) and to optimize the current solution for balcony attachment in view of reduced material usage. The design is based on a prefabricated balcony slab is fasten to a T-section whose flanges are molded in a prefabricated DFS-slab. Two tie-rods is threaded into the balcony slab and fasten to the T-section with a washer. After mounting of the balcony slab the DFS slab is molded on which stabilizes the T-section from instabilites. The results show that the structure is largely optimized but that there are room for improvements in specific places. For balconies with a length of 2.0 meters the T-section can be reduced with 10 kg of steel, which corresponds to more than 50 % of the T-section weight compared with the reference solution. Also at the 2.5 meter balconies the T-section can be reduced with 7 kg of steel, which corresponds to a 38 % reduction in material use compared with the reference solution. A common standard for the T-section is possible for balconies with a length of 2.0 and 2.5 meters.

  • 13.
    Arencibia, Ariel
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Undersökning av fasadskivor2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this report is to present some of the market's façade panels and to do a survey of Masonite façade panels and compare. Therefore I have looked closer on potential competitors and studied their assembly method and properties. I will also propose suggestions on installing Masonite panels and improvements to the current carrying system. The carrying system for façade panels in general.

     

    Various key people in various areas of the construction industry have been interviewed. People with a wide knowledge of theory and with real work experience have been my main focuses too implement this survey. I have also collected data from the façade panel system’s properties.

     

    There are benefits with Masonites façade panel but I also found that there is a possibility to make changes to improve their properties. The improvements are only theory and not tested in practice, but it could be a good start for improvement on the façade constructions. The results of my research and my proposals are explained in more details later on in this essay.

  • 14.
    Arljung, Jerry
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Byggfysik vid prefabricerade träväggar2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The work is about prefabricated houses with wooden frames. The company that I am doing thesis examination work in units Attacus Jämtlandshus Ltd whose business is to manufacture timber frames to the building industry. This work demonstrates Jämtlandshus work process and the methods used to reach to the final product. These methods are documented in detail for possible identification activities likely to affect final product quality negatively. Also reported a large number of calculations and other values that indicate what the quality of the final product is given to heat, moisture and air tightness. The report also shows how the industries that are working with production systems use them to be as effective as they can and as competitive as possible. In reaching the above, the author used a lot from their previous experience as an employee of this company, this is above all the documentation of work processes. To perform the calculations presented, the author has made use of prior knowledge from the course, building physics, and some contact with outside professionals. The work aims to, if it is possible, to identify any weak points in production and to assess how good quality the final product is given to tightness. Both the author and Jämtlandshus think it is strange that this building technique is not bigger and more "recognized" in the market than is currently the case. By reading this report, the reader can get up their interest in prefabrication to a greater extent and start weighing the advantages and disadvantages compared with site construction. This work demonstrates the quality of these houses, and some advantages of making wooden houses by prefabrication. The author's hope through this work is that more people will open their eyes to this building techniques and that, generally, people begin to talk about these types of houses.

  • 15. Asplund, Disa
    et al.
    Westin, Jonas
    Umeå University, Faculty of Social Sciences, Centre for Regional Science (CERUM).
    Modellering av slingor inom sjötransporter2017Report (Refereed)
    Abstract [en]

    The Swedish national freight transport model system Samgods is a freight model that simulates logistics decision at a disaggregated firm-to-firm level. The model calculates total annual transport demand in Sweden for all transport modes based on a deterministic cost minimization approach. The model cannot consolidate commodities of different commodity types in the same vessel, train or truck and can only simulate vessels using direct routes between two ports. This implies that many of the features of sea transport such as utilizing larger vessels and building loops to consolidate goods from different ports is not possible in the current Samgods version. In this paper, we analyze the effect of removing restrictions in sea transportation especially by allowing the ship operators to construct and utilize loops. In the new model, LIFREM (Loops Including FREight Model), the shippers’ choice of sea transport routes is modelled as a mixed integer linear programming optimization problem. In doing so, we make use of a case study on sea transport of forest products from Northern Sweden to Western Europe. The results show that allowing predefined loops decreases total logistic cost by 10% and allowing the shipper to freely select loops decreases the cost by 21%. These results show that modelling of loops is important in order to realistically represent the attractiveness of the sea transport mode. This is also confirmed by the fact that the sea mode share increases by 2–4% in LIFREM when loops are allowed.

  • 16.
    Bergdahl, Eva
    et al.
    Umeå University, Faculty of Social Sciences, Centre for Regional Science (CERUM).
    Magnus, Rönn
    Umeå University, Faculty of Social Sciences, Centre for Regional Science (CERUM).
    Planering för funktionintegrering - problem och utgångspunkter2001Report (Other academic)
  • 17.
    Berggren, Oscar
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    COMSOL Multiphysics - Ett energitekniskt analysverktyg vid numerisk simulering av köldbryggor och analys av fukt i konstruktionesdetaljer2014Independent thesis Advanced level (professional degree), 300 HE creditsStudent thesis
    Abstract [en]

    Berggren, O. (2014) COMSOL Multiphysics – An analysis tool for energy applications when conducting numerical simulations on thermal bridges and analysis of moisture in construction details. Master thesis in Energy Engineering. Department of Applied Physics and Electronics at Umeå University.

    The consultant company Tyréns has at its office in Umeå decided to evaluate the application of the software COMSOL Multiphysics.  The evaluation consisted of a simulation on an energy engineering problem with its origin from a project at Tyréns, performed in COMSOL Multiphysics.

    The chosen project for this task was a part of the design plans of the culture house Väven in Umeå. These design plans includes the analysis of a thermal bridge and moisture on a variety of construction details, where one of them was selected to be investigated further.

    The main purpose of the investigation was to analyze if the results obtained from the simulations performed in COMSOL Multiphysics were equivalent compared to the results from the design plans. The investigation also included the presentation of an overall cost estimation for the software COMSOL Multiphysics.

    The obtained results from the analysis of the thermal bridge and moisture in the construction were in both cases slightly raised compared to the results from the design plans, in average an increase of 20 %.

    The work undertaken concludes that there is fully possible to recreate the previously executed simulations extracted from the design plans in accordance to the requirements and standards that are set. The obtained results are equivalent, even though a minor difference, compared with the results from the design plans and are valid too be used in a real life scenario.

    The obtained conclusions are that it is possible to prevent moisture in the construction detail. However, the overall U-value, , indicates that the energy efficiency of the entrance square is not good enough to reach the requirements of the SNBBP (Swedish National Board of Housing, Building and Planning). Even though the U-value for the construction detail, , can be assumed to meet the criteria’s of the SNBBP.

    Due to the fact that the simulations were conducted with COMSOL Multiphysics without any major problems and provided valid results, it is considered that the software is an appropriate tool to perform simulations at Tyréns. However, the cost for a floating license of the software Flixo is much less then for COMSOL Multiphysics. COMSOL Multiphysics is at the time of this study four times as expensive as Flixo. COMSOL Multiphysics has though an advantage because it can treat problems with a multiphysical nature in one, two and three dimensions with the use of only its standard edition. To ensure that the use of COMSOL Multiphysics can be economical viable, it is necessary that the software is used in multiple applications besides performing simulations on thermal bridges and moisture in construction details.           

  • 18.
    Berglund, Johan
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Projekterings- och granskningsförbättringar: Identifiering av brister och förbättringsförslag för dessa i projekterings- och granskningsprocessen av arkitekthandlingar2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Fastec Sweden AB specializes in turnkey contracts of sports centers, industrial and commercial buildings. The overlap between design and production in turnkey contracts makes the process sensitive to defects and shortcomings in construction documents. Therefore, Fastec wants to investigate its shortcomings in the design and review process of architectural documents and see what can be improved. The purpose of the thesis is thus to identify possible shortcomings and deliver adapted proposal routines and improvement proposals for Fastec Sweden.

    For the identification of possible shortcomings, three projects have been selected to be reviewed, they´ve been projected by internal and external architectual planners and led by project managers at Fastec in Skellefteå. Documents that form the basis for and completed architectural documents have been reviewed, as well as deviation reports from the worksite. Interview talks and discussions with participants in the projects as well as other experienced and knowledgeable employees from the organization have been completed. Even previous projects evaluation documents and general shortcomings in the design work have been discussed in the interview talks.

    The resulting most frequently identified shortcomings are partly the agreement and the choice of external consultants and shortcomings in the target image that the design should work for, ie. what the production expects from the architectural documents. The design of doors and associated formation drawings and the use of too many wall types in the projects is also a common problem. So is the lack of utilization of the drawing and review programs the organization has at its disposal, as well as the low frequency of feedback and deviation reporting from the worksites.

    Proposals and improvement measures based on identified shortcomings can be found at the end of the thesis. Those who this thesis have come to the most frequent and important to change is to create a clearer target image for the early stage of the design process together with the other participants in the projects, especially the production management. To clearify what level of detail is expected of the construction and architectural documents. Rationalize the design with functional descriptions for door suppliers who are required to complete the design, as well as utilize capacity on a larger scale than today in the CAD and reviewing programs available to the organization.

  • 19.
    Bergner, Lukas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Utredning av påbyggnad för befintligt sjukhus tillhörande NUS2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    VLL (Västerbotten County Council) is currently going through a process where they review their real estate on NUS (Norrland University Hospital) with a focus on its future development and requirements. One step in this process is to examine existing real estate and analyze if development is possible before there can be necessary to expand the area. One part of this project is consequently to investigate a possible extension of a building with two parallel buildings 10A and 10B, which today consists of three operative levels with a common basement. This study assumes that it is statically possible to build on the current building components. Therefore, the aim of this project is mainly to see if it is practical to implement an extension with respect to an adjacent helipad, ongoing operatives and a functioning APD-plan where the focus lies on crane placement. And also to construct a stage classification and associated production method. All this in order to develop existing real estate on NUS without the primarily need to expand into undeveloped real estate. The method which is used to reach the project goal was to establish a task list and formulate specific questions about each activity. Then an employee of VLL answered questions in simple forms of meetings or referred to another person or to a material that was relevant. In other situations, information gathered directly from websites. After each part of the project a conclusion and recommendation has been made to choose a solution, so that the next part of the project can proceed based on previous elections. The project has resulted in an extension of the buildings 10A / B that have been possible to perform regarding the investigated areas. A framed structure of wood result that 10A should be expanded with four floors and 10B with two floors. This, with an additional extra gross floor area totaling 9,140 m2

  • 20.
    Bern, Sofia
    et al.
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Business Administration. Umeå University, Faculty of Social Sciences, Department of Geography and Economic History, Economic and social geography, Transportation Research Unit (TRUM).
    Jansson, Johan
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Business Administration. Umeå University, Faculty of Social Sciences, Department of Geography and Economic History, Economic and social geography, Transportation Research Unit (TRUM). RiseB.
    Nordlund, Annika
    Umeå University, Faculty of Social Sciences, Department of Psychology. Umeå University, Faculty of Social Sciences, Department of Geography and Economic History, Economic and social geography, Transportation Research Unit (TRUM).
    Nyman, Emma
    Umeå University, Faculty of Social Sciences, Department of Geography and Economic History, Economic and social geography, Transportation Research Unit (TRUM).
    Mobilitet och tillgänglighet – framtidens resande2016Report (Other academic)
    Abstract [sv]

    Trafikverket har gett TRUM (Transportforskningsenheten vid Umeå Universitet) i uppdrag att utreda framtidens mobilitet innefattande frågor såsom privatpersoners attityder och normer till resande med bil och däribland självkörande bilar, betalningsvilja, syn på ägande inställning till individuellt resande gentemot kollektivt resande, samt intressenters förväntningar på ett framtida tillgängligt transportsystem. Därutöver önskar Trafikverket ökad förståelse kring arbetssätt och metoder för att möta teknikutveckling och framtida mobilitet. Syftet med föreliggande rapport är att svara på dessa frågeställningar utifrån litteraturstudier och intervjuer.

    Det huvudsakliga underlaget för rapporten är en genomgång av litteratur relaterad till transporter, mobilitet och historiska såväl som framtida trender. Fokus har varit på persontransporter kopplat till människors beteende, samt vad privatpersoner, framtidsspanare och företrädare för bil- och teknikbranschen tror kommer att hända med personresande i framtiden. Utöver litteraturstudien genomfördes sex intervjuer under januari och februari 2016. Intervjuerna gjordes med syfte att öka förståelsen för hur människor resonerar kring mobilitet och transporter i dagsläget och hur de tror att vi kommer att resa i framtiden. Utifrån litteraturgenomgången och intervjuerna kan konstateras att attityder till elbilar generellt sett är positiva. Hinder för ett bredare genombrott utgörs av uppfattade prisskillnader, räckviddsångest och uppfattad brist på laddinfrastruktur. Som drivkrafter kan nämnas ökat miljömedvetande och alltmer positiva attityder bland flera olika aktörer, till exempel teknikutvecklare. När det gäller självkörande bilar är attityderna mer varierande. Bland annat lyfts säkerhetsfaktorer, tillgänglighet och det faktum att flera bilmodeller redan idag utrustas med olika typer av autonomifunktioner. Enligt olika bedömningar kommer koncept såsom Mobility as a Service och liknande att leda till förändrade attityder och normer när det gäller både privat och kollektivt resande. Avslutningsvis lämnas förslag på hur dessa och andra förändringar kan följas och förstås utifrån ett planeringsperspektiv. Olika metoder och perspektiv är viktiga för att skapa en bild över framtida utveckling redan idag, framförallt kopplat till de miljöutmaningar samhället står inför.

  • 21.
    Billmark, André
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Delreparationer av våtrum ur ett hållbart perspektiv2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Varje år anmäls det uppskattningsvis 80 000 vattenskador i fastigheter till en kostnad på nära fem miljarder kronor för de svenska försäkringbolagen. Folksam som är ett av de största försäkringsbolagen i Sverige står för cirka 26 % av de svenska villaförsäkringarna och beställer byggreparationer för uppskattningsvis 800 miljoner kronor årligen till dessa fastigheter. Som beställare av arbeten på 800 miljoner kronor finns det möjligheter att ställa krav på byggbranschen, vilket även görs.Det är inte bara Folksam som ställer krav, försäkringsbolagen sammarbetar ofta för att hjälpa till att effektivisera byggbranschen. I nuläget fokuserar försäkringsbolagen på hållbarhet, de sammarbetar med olika branschorganisationer för att möjliggöra delreparationer i våtutrymmen. Detta är något som tidigare inte varit möjligt då det inte funnits anvisningar till hur detta ska genomgöras och materialtillverkare har inte haft monteringsanvisningar för detta, delreparationer kan därför inte utföras på ett fack-mannamässigt sätt. Då det inte utförs fackmannamässigt följs inte de branschregler som idag finns i Sverige, behöriga företag utför enbart arbeten som följer branschreglerna de är certifierade inom. Exempel kan de vara certifierade inom Byggkeramikrådets branschregeler eller Säkra våtrumAv de 800 miljoner kronor som Folksam betalar ut i byggskador finns det ett mörkertal på en kostnad av skador som egentligen inte ska ersättas. Genom att öka försäkringstagares kunskaper angående fördelarna med delreparationer ska mörkertalet minskas. Det är inte bara utgifterna på 800 miljoner som kan minskas utan även en minskning av den negativa miljöbelastningen och den ohälsa som finns hos fastighetsbrukare. Uppskattningsvis kan upp till 90 % av materialet i ett våtrum sparas genom att utföra en delreparation. Utförandetiden och kostnaden av delreparationer kan minska till 1/5 genom att undvika heltäckande reparationer. Minskad utförandetid minskar perioden som de boende inte kan bruka våtrummet. Skadan åtgärdas i ett tidigt skede vilket bidrar till att motverka de boendes ohälsa som kan uppstå till följd av mögel eller liknande.Fastighetsägaren kan ta till sig denna information och se värdet i att kunna utföra delreparationer och samtidigt bidra till en hållbar utveckling.Genom djupgående studier ska information som ökar fastigetsägarnas vetskap om de framtida möjligheterna med delreparationer, samt för- och nackdelar med dessa metoder.

  • 22.
    Birkelöf, Lena Catharina
    Umeå University, Faculty of Social Sciences, Department of Economics.
    Exploring differences in expenditure for the functionally impaired: neighborhood interaction and the federal structure2010In: The annals of regional science, ISSN 0570-1864, E-ISSN 1432-0592, Vol. 44, no 1, p. 185-204Article in journal (Refereed)
    Abstract [en]

    The purpose of this paper is to study the determinants of the differences in expenditure on services for functionally impaired individuals among municipalities in Sweden. Expenditure per capita differs greatly across municipalities, even when accounting for the nature of the service. A spatial autoregressive model is used to test whether the decisions on the expenditure level in a neighboring municipality affect the municipality’s own expenditure. The results show that a positive spatial interaction exists among neighbors. However, when controlling for level differences among counties the spatial interaction coefficient becomes negative although not significantly determined. Therefore, the positive interaction first found can be interpreted either as a result of differences in the way county councils diagnose individuals or due to interaction or mimicking among the neighbors belonging to the same county council.

  • 23.
    Björklund, Johannes
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Projektering av träbroar: En undersökning av förbättringsåtgärder för anpassning av Tekla Structures mot träbroprojektering2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this project has been to study which requirements apply on wooden bridges from a design perspective, observing both external requirements and internal requirements from the company Martinsons. Based on these requirements measures would be proposed to adapt Martinsons Tekla-template model for the design of timber bridges. The theoretical part of the project has, as a starting point been conducted by studies of the Transport Administration's requirements on wooden bridges. Discussions with designers working with wooden bridges have also been conducted to get an understanding of their experiences and opinions. Furthermore, a number of previously constructed wooden bridges have been studied in order to find areas in need of improvement. With this background, it then examined which measures were feasible in Tekla. Several measures that would aim to improve the drawing quality and comply with the applicable requirements was produced and declared in the project. Measures aimed to streamline the modeling and drawing creation was also proposed. The measures proposed should enhance Martinsons Tekla-template model in a significant way, but shall in no way be considered as a definitive solution in the quest to meet the requirements concerning the design of wooden bridges. The projekct made it clear that it is not reasonable, or even feasible, to adjust the template model to meet all requirements, some adjustments must be done in each project. It also became clear that it would be good to open a dialogue with the Swedish Transport Administration to make sure what their requirements are so that Martinsons can comply with them in an effective way.

  • 24.
    Boström, Jesper
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Blockritningar och dess användning i produktion2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project is an investigation for a new method creating blueprints for in-fill walls. The original purpose of the project was only to make a comparison between different types of methods creating these blueprints. During the beginning of the work I realized that it is hard to learn how to perform the new method, and therefore I have created a guide about the procedure of the work with the new method. This project is made in cooperation together with a construction company called Peab. The idea is that the blueprints for the in-fill walls in one of Peabs upcoming constructions are going to be created with the new method.

    The purpose with this work is to compare different type of methods creating blueprints for in-fill walls. The comparison is made for the three methods, AutoCAD, Revit and blueprints made by hand. The purpose with this project has also been to create a guide for the procedure of the work in Revit.

    The first part is a study that describes the subjects in this project. The internet and literature has been used for gathering information. The second part is the comparison. The result has been compared in the categories entry requirement, running time, equipment requirement, clarity/ accuracy of the blueprints and the information that is gained in the blueprints. The third and last part is the result of the guide, which is divided into six steps. Each step is described in words and with illustrations from Revit.

    The work is written in Swedish.

  • 25.
    Brajerski, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Stability design of multi-storey timber structures2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Stability design of buildings is an extremely important discipline within the field of structural engineering.

     

    This report demonstrates, with help of a worked example, the theory behind the stabilisation of multi-storey timber structures. The worked example is an existing 6-storey building, primarily made with cross laminated timber (CLT). The construction project is located in central Umeå and is designed and managed by Martinsons Byggsystem. The building uses an array of CLT wall panels as a stabilising system.

     

    A number of key points that will be looked at in the worked example; firstly, analysing the loads acting on the building, specifically the calculation of lateral wind loads and their effect on stabilising CLT panels; secondly, a deeper look into the methods of stabilisation using CLT walls. This will include the stability checks for overturning, sliding and shear and counter measures taken against any potential instability. Finally, a look into how CLT walls can be designed by hand calculations according to Eurocodes. There is no particular predefined method to do this, so this report will show how to design a CLT wall by treating CLT as either a homogeneous material or a non-homogeneous/composite material.

  • 26.
    Brembilla, Christian
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Efficiency factors for space heating system in buildings2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The thesis focuses on the efficiency of the space heating system. In particular, the efficiency factors measure the efficiency of thermal zone. The efficiency factors measures how the energy is used in a space heating. Efficiency factors relatively close to one mean that the energy is used "efficiently'', by contrast, efficiency factors close to the zero mean that the majority of the energy is lost to the outdoor environment. This method for the appraisal of space heating performance reads as if it is apparently simple and intuitive. In reality, the efficiency factor method has several pitfalls.

    The thesis provides tools, insights and remarks on how to apply the efficiency factor method to space heating systems equipped with hydronic panel radiator and floor heating respectively. Models of the latter heaters together with the multilayer wall were developed and validated to understand the reliability of their predictions. The hypothesis is that the heat stored in the building thermal mass and heaters plays a role in defining the building thermal performance and as a result in the appraisal of the efficiency factors. The validation is based on the sensitivity bands of the models' predictions. The heaters were tested in in a thermostatic booth simulator. Benefits and drawbacks of each model were highlighted to increase awareness of their use in the engineering fields. The results showed how the models accounting for the heat stored performed the charging phase. In addition, results of how the multilayer wall delayed and damped down the heat wave coming from the outdoor environment were presented with the appraisal of the decrement factor and time delay of the indoor temperature. The results of the efficiency factors analysis reveal how the weather affects the efficiency of each locality situated in cold climates. Lastly how different control strategies impact on the efficiency factors of space heating and its distribution system. To conclude, this study highlights the paradoxes around the efficiency factor method. The thesis proposes how such factors have to be interpreted by researchers and scientists tackling the lack of information around this topic.

  • 27.
    Brembilla, Christian
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Modelling and simulation of building components: thermal interaction between multilayer wall and hydronic radiator2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Background and Scope The scope of this thesis is to investigate the thermal behaviour of building components as hydronic radiator and multilayer walls subjected to dynamic conditions. The modelling and simulation of these building components provide information on how these components thermally interact among each other. The thermal interaction is fundamental to know how the energy is used in buildings. In particular, the thermal energy used in rooms can be expressed as the efficiencies for emission in a space heating system. This thesis analyzes the efficiencies for emission of a space heating system equipped with hydronic radiator for Swedish buildings by providing a comprehensive and detailed approach on this topic.

     

    Methodology The methods used in this thesis are: experiment, modelling of multilayer wall and hydronic radiator, the dynamic simulation of the building and the efficiencies for emission of a space heating system. Here, the experiment, known as step response test, shows the heating up process of a hydronic radiator. The observation of the qualitative measurements suggests the most suitable technique of modelling the radiator known as transient modelling with multiple storage elements. The multilayer wall has been discretized both in space and time variable with a Finite Difference Method. Dynamic simulation of the building provides the efficiencies for emission of a space heating system.

     

    Findings The experimental results show how the radiator performs the charging phase. The performance of the transient model is compared with lumped steady state models in terms of temperature of exhaust flow and total heat emitted. Results of the dynamic simulation show how buildings located in a Northern climate use the energy in a better way than Southern climates in Sweden. Heavy active thermal mass provides higher efficiencies for emission than light thermal mass. Radiators with connection pipes located on the same side react faster at the thermodynamic changing of the mass flow rate by providing higher efficiencies for emission than radiators with connection pipes located on the opposite side.

     

    Conclusion and Outlook This thesis increases the knowledge about the modelling and simulation of hydronic radiators and multilayer walls. More research is needed on this topic to encompass modelling details of building components often ignored. The modelling and simulation of building components are the key to understand how building components thermally interact with each other. The thermal interaction among building components is a fundamental parameter for the assessment of efficiencies of emission of the space heating system. In the near future, the concept of efficiencies of emission can be implemented in National Building Code, therefore, this study provides guidelines on how to assess these efficiencies.

  • 28.
    Brembilla, Christian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    One dimensional model of transient heat conduction through multilayer walls/slabs: The functionality of insulation and brick materials in terms of decrement factor and time lag2016Manuscript (preprint) (Other academic)
    Abstract [en]

    Multilayer wall is a common type of building envelope used in buildings located in cold climates. The building envelope is typically composed by internal and external masses made by bricks or concrete separated by a large thickness of insulation material. This paper investigates the thermal behavior of a multilayer wall subjected to temperature excitation on both wall sides. The analysis is conducted by discretizing the continuous space and time variables of the mathematical model identified in the heat equation. Euler backwards solves the numerical model of multilayer wall by providing an unconditionally stable solution. The step response test shows the correct working of the model which reaches the steady state solution. The results of this paper are expressed in terms of temperature of each wall layer against the time. In particular, (i) the large thickness of insulation material separates thermodynamically the outside external mass from the internal mass, (ii) 20 cm thickness of insulation material damps the heat wave with a decrement factor of 3.41 °ͦC and a time lag of 1 hour, (iii) the external brick layer damps the heat wave with a decrement factor of 1.97 °ͦC and a time lag of 5 hours.

  • 29.
    Brembilla, Christian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Renman, Ronny
    Östin, Ronny
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Soleimani-Mohseni, Mohsen
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    The impact of control strategies on space heating system efficiency in low-energy buildings2018Manuscript (preprint) (Other academic)
    Abstract [en]

    In this study efficiency factors measures the thermal energy performance for space heating. This study deals with the influence of control strategies on the effriciency factors of space heating and its distribution system. An adaptive control is developed and applied to two types of heating curves (linear and non-linear) for a low-energy building equipped with renewable energy sources. The building is modelled with a hybrid approach (law driven + data driven model). The design of the floor heating is calibrated and validated by assessing the uncertainty bands for low temperatures and mass flow rate. advantages and disavantages of linear and non-linear heating curves are highlighted to illustrate their impact on space heating thermodynamic behaviour and on the efficiency factors of the space heating system.

    Practical application: The study reveals that applying commercial building energy simulation software  is worthwhile to determine reliable performance predictions. Oversimplified building models, in particular when considering building thermal mass, are not capable of simulating the thermodynamic response of a building subjected to different control strategies. The application of different heating cuirves (linear and non-linear) to massless building models leaves the amount of mass flow rate delivered to the space heating unchanged when the building is subjected to sharp variations of the outdoor temperature.

  • 30.
    Brembilla, Christian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Vuolle, Mika
    EQUA simualtion.
    Östin, Ronny
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Practical support for evaluating efficiency factors of a space heating system in cold climates: modelling and simulation of hydronic panel radiator with different location of connection pipes2017In: Energy Efficiency, ISSN 1570-646X, E-ISSN 1570-6478, Vol. 10, no 5, p. 1253-1267Article in journal (Refereed)
    Abstract [en]

    Plenty of technical norms, included in the EPBD umbrella, assess the performance of buildings or its sub-systems in terms of efficiency. In particular, EN 15316 and its sub-sections, determine the system energy requirements and the system efficiencies of space heating system. This paper focuses on the estimation of efficiencies for emission of hydronic radiators. The assessment of efficiencies for emission occurs by evaluating the amount of heat emitted  from the heat emitter and the extra thermal losses towards building envelope. The heat emitted from radiators varies during the heating up/cooling down phases. A factor that influences the heat emitted during these phases is the location of connection pipes of the radiator. Connection pipes can be located on opposite side or at the same side of the radiator. To better estimate the heat emitted from radiators a transient model with multiple storage elements is used in a building simulation model. Sensitivity analysis encompasses all  the possible variations on extra thermal losses due to the building location in different climates, the heaviness of active thermal mass and the type of radiator local control. The final outcome of this paper is a practical support where the designer can easily assess the efficiencies for emission of hydronic radiators  for Swedish buildings. As main result, (i) the efficiency for control of space heating system is higher in Northern climates than in Southern climates, (ii) heavy active thermal masses allow higher efficiencies for emission than light active thermal masses, (iii) connection pipes located on the same side of the radiator enable higher efficiencies for emission than pipes located on opposite side.

  • 31.
    Brembilla, Christian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Östin, Ronny
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Predictions' robustness of one-dimensional model of hydronic floor heating: novel validation methodology using a thermostatic booth simulator and uncertainty analysis2018In: Journal of Building Physics, ISSN 1744-2591, E-ISSN 1744-2583, Vol. 41, no 5, p. 418-444Article in journal (Refereed)
    Abstract [en]

    Hydronic floor heating models provide predictions in estimating heat transfer rates and floor surface temperature. Information on the model performance and range of validity of its results are often lacking in literature. Researchers have to know the accuracy and robustness of the model outcomes for performing energy and climate comfort calculations. This article proposes a novel validation methodology based on the uncertainty analysis of input data/parameters of one-dimensional model of hydronic floor heating tested in a thermostatic booth simulator and compared with experimental measurements. The main results are: (1) prediction accuracy between 0.4% and 2.9% for Tf and between 0.7% and 7.8% for qup when the serpentine has tube spacing (p) of 0.30 m, (2) prediction accuracy between 0.5% and 1.4% for Tf and between 8.7% and 12.9% for qup with p = 0.15m and (3) Tfld mostly affects predictions with oscillations between 6.2% and 2.2% for qup. This model provides robust and reliable predictions exclusively for qup when p = 0.30m.

  • 32.
    Brembilla, Christian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Östin, Ronny
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Soleimani-Mohseni, Mohsen
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Paradoxes in understanding the Efficiency Factors of Space Heating2018In: Energy Efficiency, ISSN 1570-646X, E-ISSN 1570-6478Article in journal (Refereed)
    Abstract [en]

    Efficiency factors are here defined as the thermal energy performance indicators of the space heating. Until recently, the efficiency factors were assumed as one value for space heating located inany climate. This study addresses the problem of how the outdoor climate affects the efficiency factors of a space heating equipped with 1D model of hydronic floor heating. The findings show how the efficiency factors, computed with two numerical methods, are correlated with the solar radiation. This study highlights the paradoxes in understanding the results of efficiency factors analysis. This work suggests how to interpret and use the efficiency factors as a benchmark performance indicator.

  • 33.
    Bretting, Viktor
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Bärverk i passivhus: Utformning och dimensionering av en limträ stomme till en passivhus skola2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 34.
    Brändström, Tobias
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Människors rörelse i Umeå centrum: Apbergets position analyserad med en agent-baserad simuleringmodell2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Simuleringsmodeller kan användas för att bättre förstå och förutspå

    människors rörelse i olika gatumiljöer. Olika typer av modeller är bra på

    olika saker, med vissa kan man på makronivå simulera hundratusentals

    personer samtidigt för att få en överblick och med vissa kan man gå ner

    på mikronivå och följa enskilda individers rörelse. Problemet med dessa

    modeller är att de inte tar hänsyn till det faktum att merparten av människor

    i en folkmassa inte är ensamma, ca 70 procent av personerna har

    kompisar, kollegor eller anhöriga som de vill hålla sig nära. Den här rapporten

    tar hänsyn till dessa grupper av människor, det tas även hänsyn

    till stillastående personer runt omkring i den simulerade miljön. I denna

    rapport belyses fördelarna och möjligheterna som nns med att använda

    simulering som hjälpmedel vid planering av olika byggnadsprojekt. Syftet

    med projektet är att skapa en simuleringsplattform och med denna simulera

    människors rörelser i Umeå centrum. Umeå centrum har genomgått

    ombyggnationer under det senaste året och genom att jämföra simulering

    av både den ursprungliga layouten och den nybyggda så erhölls följande

    resultat. I den nybyggda layouten så var  ödet av människor bättre, enligt

    simuleringen så tjänade personerna som rörde sig i centrum i snitt

    en sekund på grund av den minskade trängseln. Det nns kommersiell

    mjukvara för att simulera människors rörelse men i och med skapandet av

    denna rapport visas att motsvarande resultat kan fås med relativt enkla

    medel. Med denna simuleringsplattform kan man dessutom lätt rita upp

    de miljöer man vill simulera samt inkludera några fenomen som inte nns

    med i de kommersiella varianterna. I detta projekt så har fokus legat på

    resultatet och inte på att få simuleringen att gå så snabbt som möjligt, så

    det nns utrymme för an hel del förändringar för att snabba upp simuleringsprocessen.

  • 35.
    Burman, Christo
    Umeå University, Faculty of Arts, Comparative Literature and Scandinavian Languages. Drama-Teater-Film.
    Osynligheten tar vid där ruinerna slutar2005In: À Derrida x 13, Institutionen för konstvetenskap, Umeå universitet: Umeå , 2005, p. S. 59-63Chapter in book (Other academic)
  • 36.
    Bäckström, Simon
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Dagsljusinsläpp genom fasad: Undersökning av fönsterlösning med reflekterande ljushylla2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Buildings are constantly developing and becoming more energy efficient. This progress is partly down to building regulations forcing constructions to be better insulated, but also by using more energy efficient materials. In modern energy efficient buildings the windows are a great cause for concern. They contributes to heat loss, and if not shaded in a good way they can increase the needs for additional cooling during summer. Well planned property fenestrations can decrease the window area and thereby minimizing energy loss through windows.

     

    In the project Kub och Länk in Umeå, Link arkitekture has created a fenestration solution with a light shelf. The purpose of the light shelf is to help increase daylight transport further in to the building. This report investigates the window positioning and analyses the benefits of the light shelf.

     

    Velux daylight visualizer is used to analyze the building through computer analysis. Simulations were made in both clear and overcast skies analyzing, luminance, illuminance and daylight factor.

     

    The analyses of the daylight factor showed that the original solution was good enough to reach the gold level of Miljöbyggnad. Further simulations of the different fenestrations showed that this was not likely a result of the light shelf itself. In fact, most result indicated that the light shelf was shading the room more than lighting it and therefore created less use of the window area than regular window solutions.

  • 37. Carlsson, Fredrik
    et al.
    Lampi, Elina
    Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Economics.
    Martinsson, Peter
    The marginal values of noise disturbance from air traffic: does the time of the day matter?2004In: Transportation Research Part D: Transport and Environment, ISSN 1361-9209, E-ISSN 1879-2340, Vol. 9, no 5, p. 373-385Article in journal (Refereed)
    Abstract [en]

    This paper analyzes the marginal willingness to pay for changes in noise levels related to changes in the volume of flight movements at a city airport in Stockholm, Sweden, by using a choice experiment. When estimating marginal willingness to pay for different times of the day and days of the week, we find that these vary with the temporal dimensions: mornings and evenings have higher marginal values. Interestingly, a substantial proportion of the respondents prefer no changes in the current noise level. The paper concludes with a policy discussion related to incentive-based pricing.

  • 38.
    Carmenholdt, Jens
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    ID06 och införandet av den elektroniska personalliggaren i byggbranschen2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes a projectasignment for the client, the construction company Nåiden Bygg. Economic crime in the form of undeclared work is a major problem in the construction industry. Measures carried out in the form of new rules from Skatteverket and development of a system called ID06. The project is about exploring the new law on electronic record keeping in the construction industry and the customized system ID06. The goal is to present the most important information and development opportunities in their chosen field. The report results in costs and the time required for Nåiden Byggs implementation, a manual for the implementation of the system around the staff register to contractors and builders, and to show different developments for the system. An effort to reduce economic crime in the construction industry is going in the right direction. It is important to continue to develop common rules and systems in order to create a healthy and legal construction industry.

  • 39. Chen, Ailu
    et al.
    Cao, Qingliang
    Zhou, Jin
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Chang, Wei-Chung
    Nazaroff, William
    Indoor and outdoor particles in an air-conditioned building during and after the 2013 haze in Singapore2016In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 99, p. 73-81Article in journal (Refereed)
    Abstract [en]

    Particles released from biomass burning can contribute to severe air pollution. We monitored indoor and outdoor particles in a mechanically ventilated and air-conditioned building during and after the 2013 haze event in Singapore. Continuous monitoring of time-and size-resolved particles in the diameter range 0.01–10 μm was conducted for two weeks in each sampling campaign. During the haze event, the averaged size-resolved outdoor particle volume concentrations (dV/d(logDp)) for diameters larger than 0.3 μm were considerably higher than those during the post-haze days (9–185 μm3 cm−3versus 1–35 μm3 cm−3). However, the average number concentration of particles with diameters in the range 10–200 nm was substantially lower on the hazy days than on the post-haze days (11,400 to 14,300 particles cm−3 for hazy days, versus an average of 23,700 particles cm−3 on post-haze days). The building mechanical ventilation system, equipped with MERV 7 filters, attenuated the penetration and persistence of outdoor particles into the monitored building. Indoor particle concentrations, in the diameter ranges 0.3–1.0 μm and 1.0–2.5 μm, closely tracked the corresponding patterns of outdoor particle concentrations. For particles in the size range 0.01–1.0 μm, the size-resolved mean indoor/outdoor (I/O) ratios were in the range 0.12–0.65 with the highest mean I/O ratio at 0.3 μm (0.59 in AC on mode and 0.64 in AC off mode). The air conditioning and mechanical ventilation system with MERV 7 filters provided low single-pass removal efficiency (less than ∼ 30%) for particles with diameters of 0.01–1.0 μm. During the haze, for particles larger than ∼0.2 μm, lower I/O ratios and higher removal efficiencies occurred with the air conditioning operating as compared to with mechanical ventilation only. This observation suggests the possibility of particle loss to air conditioning system surfaces, possibly enhanced by thermophoretic or diffusiophoretic effects.

  • 40.
    Cheng, Xiaogang
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China; School of Electrical Engineering and Computer Science, Royal Institute of Technology, Stockholm, Sweden.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi'an, China.
    Liu, Guoqing
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    A total bounded variation approach to low visibility estimation on expressways2018In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, no 2, article id 392Article in journal (Refereed)
    Abstract [en]

    Low visibility on expressways caused by heavy fog and haze is a main reason for traffic accidents. Real-time estimation of atmospheric visibility is an effective way to reduce traffic accident rates. With the development of computer technology, estimating atmospheric visibility via computer vision becomes a research focus. However, the estimation accuracy should be enhanced since fog and haze are complex and time-varying. In this paper, a total bounded variation (TBV) approach to estimate low visibility (less than 300 m) is introduced. Surveillance images of fog and haze are processed as blurred images (pseudo-blurred images), while the surveillance images at selected road points on sunny days are handled as clear images, when considering fog and haze as noise superimposed on the clear images. By combining image spectrum and TBV, the features of foggy and hazy images can be extracted. The extraction results are compared with features of images on sunny days. Firstly, the low visibility surveillance images can be filtered out according to spectrum features of foggy and hazy images. For foggy and hazy images with visibility less than 300 m, the high-frequency coefficient ratio of Fourier (discrete cosine) transform is less than 20%, while the low-frequency coefficient ratio is between 100% and 120%. Secondly, the relationship between TBV and real visibility is established based on machine learning and piecewise stationary time series analysis. The established piecewise function can be used for visibility estimation. Finally, the visibility estimation approach proposed is validated based on real surveillance video data. The validation results are compared with the results of image contrast model. Besides, the big video data are collected from the Tongqi expressway, Jiangsu, China. A total of 1,782,000 frames were used and the relative errors of the approach proposed are less than 10%.

  • 41. Cheng, Xiaogang
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Liu, Guoqing
    Olofsson, Thomas
    Li, Haibo
    Atmospheric visibility detection based on total variation and piecewise stationary time series for fog and haze weather2018In: Sustainable cities and society, ISSN 2210-6707Article in journal (Refereed)
  • 42.
    Cheng, Xiaogang
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Liu, Guoqing
    Li, Haibo
    A pilot study of online non-invasive measuring technology based on video magnification to determine skin temperature2017In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 121, p. 1-10Article in journal (Refereed)
    Abstract [en]

    Much attention was paid on human centered design strategies for environmental control systems of indoor built environments. The goal is to achieve thermally comfortable, healthy and safe working or living environments in energy efficient manners. Normally building Heating, Ventilation and Air Conditioning (HVAC) systems have fixed operating settings, which can't satisfy human thermal comfort requirements under transient and non-uniform indoor thermal environments. Therefore, human thermal physiology signal such as skin temperature, which can reflect human body thermal sensation, has to be measured over time. Several trials have been performed by minimizing measuring sensors such as i-Button and mounting measuring sensors into wearable devices such as glasses. Infrared thermography technology has also been tried to achieve non-invasive measurements. However, it would be much more convenient and feasible if normal computer camera could record images, which could be used to obtain human thermal physiology signals. In this study, skin temperature of hand back, which has a high density of blood vessels and is normally not covered by clothing, was measured by i-button sensors. Images recorded by normal camera were amplified to analyzing skin temperature variation, which are impossible to see with naked eyes. The agreement between i-button sensor measuring results and image magnification results demonstrated the possibility of non-invasive measuring technology by image magnification. Partly personalized saturation-temperature model (T = 96.5 × S + bi) can be used to predict skin temperatures for young East Asia females.

  • 43. Cheng, Yuanda
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China.
    Lin, Zhang
    Yang, Jinming
    Jia, Jie
    Du, Zhenyu
    Cooling load calculation methods in spaces with stratified air: a brief review and numerical investigation2018In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 165, p. 47-55Article, review/survey (Refereed)
    Abstract [en]

    Due to vertically thermal stratification in indoor spaces, the cooling load calculation is always a challenge in the design of stratified air distribution systems (STRAD), which in turn is crucial to determine the supply air flow rate and the cooling load to be removed by the air conditioning system. In this paper, several cooling load calculation methods, developed in the past 20 years and focused on STRAD systems, were briefly reviewed. It attempts to clarify these methods in terms of their advantages, limitations and suitable ranges of applications. Furthermore, series of numerical simulations with a total number of 56 cases were conducted, and the applications of a novel cooling load calculation method in STRAD systems were investigated. The reliability of the method was validated for STRAD systems with separated locations of return and exhaust grilles, when adopted in three typical spaces with different building heights, namely a small office, a large terraced classroom and a terminal building. Databases of effective cooling load factors (ECLF;) for different heat sources distributed in the three spaces were obtained and presented, which can be conveniently used to calculate cooling loads. In addition, the influences of return grill height on the occupied zone cooling load as well as the energy saving potentials of STRAD systems were also clarified. The results presented in this paper are helpful for the design and optimization of STRAD systems.

  • 44.
    Daerga, Per-Anders
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Girhammar, Ulf Arne
    Kallsner, Bo
    A complete timber building system for multi-storey buildings2014In: Construction materials and structures, 2014, p. 1164-1171Conference paper (Refereed)
    Abstract [en]

    The Masonite Flexible Building (MFB) system is a complete timber building system for commercial and residential multi-storey houses. The system is for tall and large buildings with long floor spans. The MFB system uses prefabricated wall, floor and roof elements which are delivered in flat packages and erected on the construction site. The MFB system might be classified as a panel construction, where the load-carrying structure consists of composite lightweight timber I-beams mechanically integrated with a composite laminated wood panel called PlyBoard T. The I-beams and the panel form a strong and rigid carcass for wall and floor elements, making the system well suited for high rise construction. A key feature of the MFB system is the connection technique which enables swift erection of the system units on site. The PlyBoard T panels are provided with a continuous slot along the periphery. The slot is used as a general connection interface for the joining of the wall elements. The floor elements are suspended and hooked onto the bearing walls using sheet steel hangers, allowing swift assembling of the floor deck and enabling direct vertical wall-to-wall load transfer parallel to grain. The paper presents the construction principles, system components and units, erection technique, functional and architectural aspects of the Masonite Building System.

  • 45.
    Daerga, Per-Anders
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Girhammar, Ulf Arne
    Luleå University of Technology.
    Källsner, Bo
    Linnæus University.
    Masonite Flexible Building System for Multi-Storey Timber Buildings2012In: World Conference on Timber Engineering 2012 (WCTE 2012) / [ed] Pierre Quenneville, 2012Conference paper (Other academic)
    Abstract [en]

    ABSTRACT: The Masonite Flexible Building (MFB) system is a complete timber building system for commercial and residential multi-storey houses. The system is subdivided into two market variants; XL and Light. The XL version is for tall and large buildings with long floor spans while the Light version is adapted for smaller buildings with lower loads. Though differing in technical performance, the functional criteria are the same for both variants. The MFB system uses prefabricated wall, floor and roof elements which are delivered in flat packages and erected on the construction site. The MFB system might be classified as a panel construction, where the load-carrying structure consists of composite light-weight timber I-beams mechanically integrated with a composite laminated wood panel called PlyBoard™. The I-beams and the panel form a strong and rigid carcass for wall and floor elements, making the system well suited for high rise construction. A key feature of the MFB system is the connection technique which enables swift erection of the system units on site. The plyboard panels are provided with a continuous slot along the periphery. The slot is used as a general connection interface for the joining of the wall elements. The floor elements are suspended and hooked onto the bearing walls using sheet steel hangers, allowing swift assembling of the floor deck and enabling direct vertical wall-to-wall load transfer parallel to grain. The paper presents the construction principles, system components and units, erection technique and functional and architectural aspects of the Masonite Building System.

    KEYWORDS: Masonite Flexible Building system, multi-storey timber buildings, slotted-in connections, suspended connections, functionality requirements.

  • 46.
    Daerga, Per-Anders
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Girhammar, Ulf Arne
    Luleå University of Technology.
    Källsner, Bo
    Linnæus University.
    Slotted-in Steel-Plate connections for Panel Wall Elements - Experimental and Analytical Study2012In: World Conference on Timber Engineering 2012 (WCTE 2012) / [ed] Pierre Quenneville, 2012, p. 451-460Conference paper (Other academic)
    Abstract [en]

    ABSTRACT: This paper presents an experimental and analytical study of a steel plate connection for joining walls in the Masonite Flexible Building (MFB) system. These connections are used partly for splicing the wall elements and partly for tying down uplifting forces and resisting horizontal shear forces in stabilizing shear walls. The steel plates are inserted in a perimeter slot in the plyboard panel (a composite laminated wood panel) and fixed mechanically with screw fasteners. The load-bearing capacity of the slotted-in steel plate connections are determined experimentally and derived analytically for different failure modes. The test results show ductile post-peak load-slip characteristics, indicating that a plastic design method for shear walls can be applied to calculate the horizontal load-bearing capacity. The slotted-in steel plate connection concept can also be used for joining shear walls to transverse walls for tying down purposes in order to simplify the stabilization system of the building. The use of transverse walls for resisting uplifting forces introduces a three-dimensional behaviour of the wall junction and a more effective load transfer.

    KEYWORDS: Slotted-in steel plate timber connections, timber wall elements, multi-storey timber building, Masonite Flexible Building system.

  • 47.
    Daerga, Per-Anders
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Girhammar, Ulf Arne
    Luleå University of Technology.
    Källsner, Bo
    Linnæus University.
    Suspended Floor Element Connections for the Masonite Flexible Building System2012In: World Conference on Timber Engineering 2012 (WCTE 2012) / [ed] Pierre Quenneville, 2012, p. 465-472Conference paper (Other academic)
    Abstract [en]

    The authors present an experimental study of a suspended floor element connection (sheet steel hangers) employed in the Masonite Flexible Building (MFB) system. The hangers are mounted with screws and are pre-attached to the floor elements at manufacturing. This arrangement makes the design of the hanger critical with respect to safety and load transfer redundancy, since the screws transfer all the loads, both withdrawal and shear forces can act simultaneously. Tests have been carried out to examine the structural behaviour of the hanger. The two most critical load cases, vertical floor load and horizontal wind suction load, and three different screw joint configurations were investigated. The results indicate that the vertical distance between the screw joint and the upper edge of the rim beam should be increased and that withdrawal forces on the screws should be kept as low as possible. Some suggestions for improving the present design are given and a modified design is proposed to enhance the load-bearing capacity and to improve the overall safety and redundancy.

  • 48.
    Danielski, Itai
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande, Östersund.
    Nair, Gireesh
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Fröling, Morgan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för ekoteknik och hållbart byggande, Östersund.
    Heated atrium in multi-storey apartment buildings: a design for better energy efficiency and social interactions2013In: Passivhus Norden, 2013Conference paper (Refereed)
  • 49.
    Davoli, Lorenzo
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    Redström, Johan
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    Materializing infrastructures for participatory hacking2014In: DIS '14 Proceedings of the 2014 conference on Designing interactive systemsPages, Association for Computing Machinery (ACM), 2014, p. 121-130Conference paper (Refereed)
    Abstract [en]

    This paper presents a design exploration of opportunities for opening up industrial infrastructures in order to make them supportive of more sustainable and locally adaptive configurations. Taking logistic services in a rural area as a case study, we describe a set of interventions in tracing and expressing their underlying functionalities to make them available as design material. The insights gained inspired the speculative design of a concept for a distributed and community-owned delivery network performed by drones. The case illustrates the potential that can be made available when opening up infrastructures for participative design interventions.

  • 50.
    Davoli, Lorenzo
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    Wiltse, Heather
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    Redström, Johan
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    Trojans & Drones: Materializing possibilities for transforming industrial infrastructures2015In: Proceedings of the 2nd Biennial Research Through Design Conference, Cambridge, UK, 2015Conference paper (Refereed)
    Abstract [en]

    Emerging post-industrial societal needs require the evolution of existing networks of industrial infrastructures toward more distributed and citizen-centered configurations. This opens up new questions regarding what design processes and practices are necessary to effect change within these systems that are often deliberately not accessible and open for design interventions. We here present a set of design explorations in tracing and materializing infrastructures in order to make them available for design and participation, taking logistic services in a remote rural

    area of northern Sweden as a case study and field site. A design concept consisting of a drone and drone postbox were used to speculate about the possibility of a community-owned delivery network operated by drones

    in synergy with existing infrastructures. We used these artifacts in staging participatory processes of imagination and experimentation in order to explore possible future configurations. The project provides an example of a possible framework for initiating and curating the transformation

    of industrial systems towards more open and locally adaptive forms and functions.

    In particular, it illustrates the rich potential and opportunities for design when it comes to ways of knowing and designing with the infra- structural—that which is usually hidden beneath the surface. 

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