Sökning: "Thermal conductivity"

Visar resultat 21 - 25 av 373 avhandlingar innehållade orden Thermal conductivity.

  1. 21. Robust and Durable Vacuum Insulation Technology for Buildings

    Författare :Peyman Karami; Folke Björk; Kjartan Gudmundsson; Jan Akander; KTH; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Vacuum Insulation panels VIPs ; Million Program; Energy saving; Thermal conductivity; thermal transmittance U-value ; Thermal bridges; Stationary and transient measurements; Dynamic simulations of heat and moisture conditions; Full scale measurement in climatic chamber; LCA; Vakuumisoleringspaneler VIP:ar ; Miljonprogrammet; Energibesparing; Värmeledningsförmåga; värmegenomgångskoefficient U-värdet ; Köldbryggor; Stationära och transienta mätningar; Dynamiska simuleringar av värme och fuktförhållanden; Fullskaleförsök i klimatkammare; LCA; Byggvetenskap; Civil and Architectural Engineering;

    Sammanfattning : Today’s buildings are responsible for 40% of the world’s energy use and also a substantial share of the Global Warming Potential (GWP). In Sweden, about 21% of the energy use can be related to the heat losses through the climatic envelope. LÄS MER

  3. 22. Analysis of thermal shock in brittle materials

    Författare :Marianne Collin; KTH; []
    Nyckelord :thermal shock; thermal stress; stress intensity; vickers indentation; alumina; silicon varbide whisker reinforced alumina;

    Sammanfattning : This thesis concerns thermal shock damage of ceramicmaterials. More specifically the work is focused on theoreticaland practical aspects of a new technique for determining thethermal shock resistance of brittle materials. LÄS MER

  4. 23. Thermal response tests : influence of convective flow in groundwater filled borehole heat exchanger

    Författare :Anna-Maria Gustafsson; Jeffrey D. Spitler; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering; VA-teknik; Urban Water Engineering;

    Sammanfattning : The main objective of this doctorial thesis was to investigate how thermally induced movements in the groundwater (natural convective flow) may influence the heat transport in borehole and surrounding bedrock in a groundwater filled borehole heat exchanger system. The purpose was also to determine if thermal response tests could be used to detect the convective influence and the effect on evaluated heat transfer parameters, effective bedrock thermal conductivity and borehole thermal resistance. LÄS MER

  5. 24. Thermal response test : numerical simulations and analyses

    Författare :Anna-Maria Gustafsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering; VA-teknik; Urban Water Engineering;

    Sammanfattning : When constructing large borehole heat exchanger (BHE) systems, bedrock and borehole thermal properties are vital for a good design. Today's design programs presume conductive heat transfer in both borehole and bedrock. LÄS MER

  7. 25. Thermal response test : method development and evaluation

    Författare :Signhild Gehlin; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Sammanfattning : Since the first introduction of thermal response tests with mobile measurement devices in Sweden and USA in 1995, the method has developed and spread in North America and Europe. Thermal response tests have so far been used primarily for in situ determination of design data for BHE (borehole heat exchanger) systems, but also for evaluation of grout material, heat exchanger types and groundwater effects. LÄS MER