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Soleimani-Mohseni, Mohsen
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Publications (8 of 8) Show all publications
Brembilla, C., Östin, R., Soleimani-Mohseni, M. & Olofsson, T. (2019). Paradoxes in understanding the Efficiency Factors of Space Heating. Energy Efficiency, 12(3), 777-786
Open this publication in new window or tab >>Paradoxes in understanding the Efficiency Factors of Space Heating
2019 (English)In: Energy Efficiency, ISSN 1570-646X, E-ISSN 1570-6478, Vol. 12, no 3, p. 777-786Article in journal (Refereed) Published
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 in any 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.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Efficiency factors, Space heating, Accuracy 1D model of hydronic floor heating, Outdoor climate, Performance indicator, Solar radiation, Benchmark, Linear regression model
National Category
Building Technologies
Research subject
engineering science with specialization in microsystems technology
Identifiers
urn:nbn:se:umu:diva-149931 (URN)10.1007/s12053-018-9692-y (DOI)000461106400015 ()2-s2.0-85049553312 (Scopus ID)
Projects
Reliability and robustness of efficiency factors theory of the space heating equipped with hydronic technologies
Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2019-04-04Bibliographically approved
Brembilla, C., Renman, R., Soleimani-Mohseni, M., Östin, R. & Olofsson, T. (2019). The impact of control strategies on space heating system efficiency in low-energy buildings. Building Services Engineering Research & Technology, 40(6), 714-731
Open this publication in new window or tab >>The impact of control strategies on space heating system efficiency in low-energy buildings
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2019 (English)In: Building Services Engineering Research & Technology, ISSN 0143-6244, E-ISSN 1477-0849, Vol. 40, no 6, p. 714-731Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
London: Sage Publications, 2019
Keywords
Efficiency factors of space heating and distribution system, Calibration through uncertainty bands, Hybrid model of low-energy building: law-driven + data-driven model, Outdoor temperature compensation or heating curve, Feedback and feed-forward control loop + adaptive control, Solar radiation model
National Category
Building Technologies
Identifiers
urn:nbn:se:umu:diva-151980 (URN)10.1177/0143624418822454 (DOI)000491440700005 ()2-s2.0-85060767454 (Scopus ID)
Available from: 2018-09-21 Created: 2018-09-21 Last updated: 2019-12-19Bibliographically approved
Soleimani-Mohseni, M., Nair, G. & Hasselrot, R. (2016). Energy simulation for a high-rise building using IDA ICE: investigations in different climates. Building Simulation, 9(6), 629-640
Open this publication in new window or tab >>Energy simulation for a high-rise building using IDA ICE: investigations in different climates
2016 (English)In: Building Simulation, ISSN 1996-3599, E-ISSN 1996-8744, Vol. 9, no 6, p. 629-640Article in journal (Refereed) Published
Abstract [en]

In this paper a model of a high-rise building is constructed in the simulation program IDA ICE. The model is based on an IFC-model of a demonstration building constructed in Ljubljana, Slovenia, as part of an EU-project, EE-high-rise. The model's energy performance was simulated for four cities: Umeå (Scandinavia), Ljubljana (Central Europe), Sibenik (Mediterranean) and Dubai (The Persian Gulf). Furthermore, the climate envelope of the building was modified with the aim to improve the model's energy performance in each of the regions. The results were evaluated according to the energy requirements of passive house standard by the German Passive House Institute. The analysis suggests that the reference building model, which itself incorporates several energy efficient components, was unable to meet the German passive house standard in none of the four cities (Umeå, Ljubljana, Sibenik and Dubai) studied. By providing a combination of energy saving measures, such as modifications of thermal resistance of building envelope, the building may be able to meet the passive house standard in Ljubljana. The analysis concludes that the reduction in window area results in reduction of both heating and cooling demand. Increase in the thickness of the insulation and the thermal resistance of windows reduces the space heating demand for Umeå, Ljubljana and Sibenik (not applied for Dubai) while increasing the cooling demand for these cities. Increased airtightness has marginal effect on heating and cooling demand for all investigated cities. Reduced thermal resistance of windows will decrease cooling demand for Ljubljana, Sibenik and Dubai (not applied for Umeå). Reduced insulation thickness (not applied for Umeå) will decrease cooling demand for Ljubljana and Sibenik but not for Dubai. Reducing the insulation thickness may often result in reduced cooling demand for moderately warm countries since the average outdoor temperature could be lower than the indoor temperature during part of the cooling season. In those situations a reduced insulation thickness can cause heat flow from the relatively hot inside to the colder outside. However, for hot climates like in Dubai where outdoor temperature is higher than the indoor temperature for most of the year, reducing the insulation thickness will increase the cooling demand. This result suggests that the insulation thickness must be chosen and optimized based on heating and cooling demand, internal heat gain, and outdoor climate

Place, publisher, year, edition, pages
Tsinghua University Press, 2016
Keywords
energy performance of buildings, simulation, high-rise buildings, IDA ICE, passive house, building envelop, climate zones
National Category
Energy Engineering Construction Management Building Technologies
Identifiers
urn:nbn:se:umu:diva-124409 (URN)10.1007/s12273-016-0300-9 (DOI)000383847600002 ()
Available from: 2016-08-10 Created: 2016-08-10 Last updated: 2018-06-07Bibliographically approved
Brembilla, C., Soleimani-Mohseni, M. & Olofsson, T. (2015). Hybrid heating system for open-space office/laboratory. In: Karlsruher Institut für Technologie (KIT) (Ed.), Energy, Science and Technology 2015: Book of Abstracts. The energy conference for scientists and researchers. Paper presented at EST, Energy Science Technology, International Conference & Exhibition, 20-22 May 2015, Karlsruhe, Germany (pp. 315-315). Karlsruher, Germany: Karlsruhe, KIT, 1
Open this publication in new window or tab >>Hybrid heating system for open-space office/laboratory
2015 (English)In: Energy, Science and Technology 2015: Book of Abstracts. The energy conference for scientists and researchers / [ed] Karlsruher Institut für Technologie (KIT), Karlsruher, Germany: Karlsruhe, KIT , 2015, Vol. 1, p. 315-315Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Open-space office/laboratory are quite common in Scandinavia and they are usually designed for multipurposework. There are office area where is possible to work standing up and in the same time to work at the desk. Forthis purpose a hybrid heating system made by electric convectors and panel radiators is investigated. Two stepresponse tests of the hybrid heating system are performed at the laboratory of Umeå University. The first test isexecuted during the week, disturbances from heat sources degrading the quality of the results. The second test isperformed during week-end. The error analysis shows a maximum discrepancies of +0.6 °C between measuredand simulated data. However, a thermal time constant of the room can be deducted and use it for controlling purposes.

Place, publisher, year, edition, pages
Karlsruher, Germany: Karlsruhe, KIT, 2015
Keywords
Open office, Hybrid heating system, Step response test, Error analysis
National Category
Engineering and Technology
Identifiers
urn:nbn:se:umu:diva-109889 (URN)
Conference
EST, Energy Science Technology, International Conference & Exhibition, 20-22 May 2015, Karlsruhe, Germany
Available from: 2015-10-08 Created: 2015-10-08 Last updated: 2018-06-07Bibliographically approved
Brembilla, C., Lacoursiere, C., Soleimani-Mohseni, M. & Olofsson, T. (2015). Investigation of thermal parameters addressed to a building simulation model. In: Karlsruher Institute of Technology (KIT) (Ed.), Energy, Science and Technology 2015: Book of Abstracts. The energy conference for scientists and researchers. Paper presented at EST, Energy Science Technology, International Conference & Exhibition, 20-22 May 2015, Karlsruhe, Germany (pp. 128). Karlsruher, Germany: Karlsruher Institute of Technology (KIT), 1
Open this publication in new window or tab >>Investigation of thermal parameters addressed to a building simulation model
2015 (English)In: Energy, Science and Technology 2015: Book of Abstracts. The energy conference for scientists and researchers / [ed] Karlsruher Institute of Technology (KIT), Karlsruher, Germany: Karlsruher Institute of Technology (KIT) , 2015, Vol. 1, p. 128-Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Introduction The uncertainty of setting input parameters in a building model can have a major impact on the simulated output. The tolerance of thermal parameters is a necessary information that helps modeler to know the influence of eachfactors on the outcomes. This paper shows the allowable tolerance of thermal parameters in order to build anaccurate building model.

Place, publisher, year, edition, pages
Karlsruher, Germany: Karlsruher Institute of Technology (KIT), 2015
Keywords
Tolerance of thermal parameters, Hybrid model, Differential sensitivity analysis, Proportional control
National Category
Engineering and Technology
Identifiers
urn:nbn:se:umu:diva-109880 (URN)
Conference
EST, Energy Science Technology, International Conference & Exhibition, 20-22 May 2015, Karlsruhe, Germany
Available from: 2015-10-08 Created: 2015-10-08 Last updated: 2018-06-07Bibliographically approved
Brembilla, C., Lacoursiere, C., Soleimani-Mohseni, M. & Olofsson, T. (2015). Investigations of thermal parameters addressed to a building simulation model. In: Proceedings of BS2015: . Paper presented at Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad, India, Dec. 7-9, 2015. (pp. 2741-2748). India, Hyderabad: International Building Performance Simulation Association (IBPSA)
Open this publication in new window or tab >>Investigations of thermal parameters addressed to a building simulation model
2015 (English)In: Proceedings of BS2015, India, Hyderabad: International Building Performance Simulation Association (IBPSA), 2015, , p. 2741-2748p. 2741-2748Conference paper, Published paper (Refereed)
Abstract [en]

This paper shows the tolerance of thermal parameters addressed to a building simulation model in relation to the local control of the HVAC system. This work is suitable for a modeler that has to set up a building simulation model. The modeler has to know which parameter needs to be considered carefully and vice-versa which does not need deep investigations. Local differential sensitivity analysis of thermal parameters generates the uncertainty bands for the indoor air. The latter operation is repeated with P, PI and PID local control of the heating system. In conclusion, the local control of a room has a deterministic impact on the tolerance of thermal parameters.

Place, publisher, year, edition, pages
India, Hyderabad: International Building Performance Simulation Association (IBPSA), 2015. p. 2741-2748
Keywords
Hybrid model of a room, local sensitivity analysis, HVAC, tolerance of thermal parameters
National Category
Engineering and Technology
Research subject
engineering science with specialization in microsystems technology
Identifiers
urn:nbn:se:umu:diva-116129 (URN)
Conference
Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad, India, Dec. 7-9, 2015.
Available from: 2016-02-08 Created: 2016-02-08 Last updated: 2018-09-21Bibliographically approved
Brembilla, C., Soleimani-Mohseni, M. & Olofsson, T. (2015). Transient model of a panel radiator. In: Karlsruher Institut für Technologie (KIT) (Ed.), Energy, Science and Technology 2015: Book of Abstracts. The energy conference for scientists and researchers. Paper presented at EST, Energy Science Technology, International Conference & Exhibition, 20-22 May 2015, Karlsruhe, Germany (pp. 321-321). Karlsruher, Germany: Karlsruher Institut für Technologie (KIT), 1
Open this publication in new window or tab >>Transient model of a panel radiator
2015 (English)In: Energy, Science and Technology 2015: Book of Abstracts. The energy conference for scientists and researchers / [ed] Karlsruher Institut für Technologie (KIT), Karlsruher, Germany: Karlsruher Institut für Technologie (KIT) , 2015, Vol. 1, p. 321-321Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

This paper shows a detailed transient model of a panel radiator considered as a system of multiple storageelements. The experiment records the temperature surface of the panel in the process of heating up. Thequalitative results of the experiment suggest the more appropriate technique for modelling this technology. The transient model performs the modelling with horizontal thermal capacitances connected in series. This modelcalculates the temperature of exhaust flow, heat emission towards indoor environment, temperature gradient onpanel surface, dead and balancing time identified numerically on the chart.

Place, publisher, year, edition, pages
Karlsruher, Germany: Karlsruher Institut für Technologie (KIT), 2015
Keywords
Transient model, Multiple storage elements, Heat emission, Exhaust flow, Step response
National Category
Engineering and Technology
Identifiers
urn:nbn:se:umu:diva-109888 (URN)
Conference
EST, Energy Science Technology, International Conference & Exhibition, 20-22 May 2015, Karlsruhe, Germany
Available from: 2015-10-08 Created: 2015-10-08 Last updated: 2018-06-07Bibliographically approved
Brembilla, C., Soleimani-Mohseni, M. & Olofsson, T. (2015). Transient model of a panel radiator. In: Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad, India, Dec. 7-9, 2015. Paper presented at Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad, India, Dec. 7-9, 2015. (pp. 2749-2756). India, Hyderabad: International Building Performance Simulation Association (IBPSA)
Open this publication in new window or tab >>Transient model of a panel radiator
2015 (English)In: Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad, India, Dec. 7-9, 2015, India, Hyderabad: International Building Performance Simulation Association (IBPSA), 2015, , p. 2749-2756p. 2749-2756Conference paper, Published paper (Refereed)
Abstract [en]

This paper shows a transient model of a hydronic panel radiator modelled as a system of multiple storage elements. The experiment´s results suggest the more suitable technique for modelling this technology. The panel radiator is modelled numerically with eight thermal capacitance connected in series by keeping a memory of the heat injected in the thermal unit. The comparison of the performance among lumped steadystate models and transient model, in terms of heat emission and temperature of exhaust flow, shows the potential of the latter approach. To conclude, (1) the transient phase is essential for modelling stocky panels, and (2) this type of modelling has to be addressed for evaluating the performance of low energy buildings.

Place, publisher, year, edition, pages
India, Hyderabad: International Building Performance Simulation Association (IBPSA), 2015. p. 2749-2756
Keywords
Transient model of panel radiator, EN 15316
National Category
Energy Engineering
Research subject
engineering science with specialization in microsystems technology; English
Identifiers
urn:nbn:se:umu:diva-116130 (URN)
Conference
Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association, Hyderabad, India, Dec. 7-9, 2015.
Available from: 2016-02-08 Created: 2016-02-08 Last updated: 2018-09-21Bibliographically approved
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