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  • 351.
    Zhang, Yang
    et al.
    Architectural Design Institute of Tianjin University.
    Yang, Bin
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Discussion of energy efficiency for HVAC systems2012Inngår i: China Building Materials and Construction (Chinese Journal), Vol. 6, s. 17-18Artikkel i tidsskrift (Fagfellevurdert)
  • 352.
    Zhou, Jin
    et al.
    Nanyang Technological University.
    Chen, Ailu
    Nanyang Technological University.
    Cao, Qingliang
    Nanyang Technological University.
    Yang, Bin
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Chang, Wei-Chung
    Nanyang Technological University.
    Nazaroff, William
    University of California, Berkeley.
    Particle exposure during the 2013 haze in Singapore2014Inngår i: Indoor Air 2014, Hong Kong : exploring indoor air sciences for a sustainable built environment: proceedings of the 13th International Conference on Indoor Air Quality and Climate, July 7-July 12, 2014 / [ed] Yuguo Li and Xinyan Yang, 2014, s. 658-Konferansepaper (Fagfellevurdert)
  • 353.
    Ziankevich, Maryia
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen Designhögskolan.
    Local Roots: Celebrating sustainable methods of food production2013Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Local Roots is a design of a system where local interest circles and study groups share their knowledge and interest in the context of an outdoor museum. Here, museum visitors can get inspired by a first glimpse into the local culture of traditional food production. This thesis project mainly focuses on the introduction experience to this system, on the outdoor museum plant tour "what's my flavor". Interactive plant audio installations of this tour are placed around the territory of the museum. By touching different parts of a plant, museum visitors trigger information about its nutritional and cultural values. They start to see food opportunities in natural ecosystems, gain experience and train watchfulness the same way they would do it for centuries before, by touching, smelling and reading the signs of nature together with the more experienced peers.

  • 354.
    Åstrand, Max
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
    Ventilation Performance Monitoring in Underground Mines2016Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    Ventilation of underground mines is a critical, complex and expensive activity. Removing pollutants from e.g. diesel equipment is important to insure a safe and operable work environment in the mine. The energy consumption of ventilation for an underground mine typically comprises around 30-50% of the total energy consumption of underground mine operation. It is therefore vital that the performance of the ventilation system can be monitored and maintained as high as possible. The goal of this project is to develop methods  and algorithms which are useful in this context. The developed methods and algorithms are tested in two real mine case studies.

  • 355.
    Öhman, Marcus
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik, Energiteknik och termisk processkemi.
    Boman, Christoffer
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik, Energiteknik och termisk processkemi.
    Hedman, Henry
    Energy Technology Centre, Piteå, Sweden.
    Nordin, Anders
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik, Energiteknik och termisk processkemi.
    Boström, Dan
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik, Energiteknik och termisk processkemi.
    Slagging tendencies of wood pellet ash during combustion in residential pellet burners2004Inngår i: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 27, nr 6, s. 585-596Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ash related problems have more than occasionally been observed in pellet burners during the last years. These problems can lead to reduced accessibility of the combustion systems as well as bad publicity for the market. The objectives of the present work were to; (i) evaluate how different raw materials for pellets affect the accessibility of the existing burner equipment, (ii) determine which of the ash forming element(s) that could be responsible for the deposit/slagg formation and, (iii) estimate the critical slagging temperature for the different raw materials. Stored and fresh materials from sawdust, logging residues and bark were used as raw material in three different pellet burners. The results showed that the slagging properties were relatively sensitive to the variations in total ash content and ash forming elements of the fuel. It is therefore recommended that ash rich fuels like bark and logging residues should not be used in the existing residential pellet burners. Both fuel and burner type affected the amounts of ash deposit produced. The degree of sintering (i.e. the strength of the deposits) was mostly affected by the fuel composition. Subsequent controlled sintering test of the produced deposits/slags showed critical slagging temperatures of about 850–900 °C for stored bark and about 1000 °C for fresh bark and stored and fresh materials from sawdust and logging residues. The results further indicated that the Si-content in the fuel correlated (relatively) well to the sintering tendencies in the burners. Chemical equilibrium models were used to interpret the experimental findings, and good quantitative agreements between modelling and experimental results were generally obtained.

  • 356.
    Öhrman, Jakob
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
    Evaluation of a CFD method for estimating aerodynamic loads on external stores on JAS 39 Gripen2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Loads determination for external stores on fighter aircraft is an important task for manufacturers in ensuring the safe operation of their aircraft. Due to the large number of possible store combinations, wind tunnel tests – the primary approach to obtaining loads data – cannot be performed for all configurations. Instead, supplementary techniques to estimating loads are necessary. One approach is to use information from another store and adapt it, using so-called scaling methods, to the non-tested store.

    In this thesis, a scaling method combining the results of computational fluid dynamics (CFD) simulations, for both a non-tested and a reference store, with existing wind tunnel data for the reference store, is thoroughly examined for a number of different stores, angles of attack, sideslip angles and Mach numbers. The performance of the proposed scaling method is assessed in relation to currently used scaling methods, using non-parametric and multivariate statistics.

    The results show no definitive improvement in performance for the proposed scaling method over the current methods. Although the proposed method is slightly more conservative, considerable variability in the estimates and an increased time consumption for scaling leads the author to advise against using the proposed method for scaling aerodynamic loads on external stores.

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