Sökning: "dynamic heat conduction"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden dynamic heat conduction.

  1. 1. Thermal Modeling of Walls, Foundations and Whole Buildings Using Dynamic Thermal Networks

    Författare :Eva-Lotta Wentzel; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; walls; weighting functions; Dynamic thermal networks; building; dynamic heat conduction; foundation; step-response functions;

    Sammanfattning : The modeling of the energy balance of buildings is a major task in building physics. A new theory called dynamic thermal networks is under development at the Building Physics Research Group at Chalmers. The calculations are based on step-response functions, and the problems are illustrated in so-called dynamic networks. LÄS MER

  3. 2. A study of surface temperature and heat flux estimations in heating processes by solving an Inverse Heat Conduction Problem

    Författare :Patrik Wikström; Wlodzmierz Blasiak; Björn Palm; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Metallurgical process engineering; Metallurgisk processteknik;

    Sammanfattning : The topic of this thesis is estimation of the dynamic changes of the surface temperatureand heat flux during heating processes by using an inverse method. The local transient surface temperature and heat flux of a steel slab are calculated based on measurements in the interior of the slab. LÄS MER

  4. 3. Characterization of Conduction and Polarization Properties of HVDC Cable XLPE Insulation Materials

    Författare :Hossein Ghorbani; Hans Edin; Erling Ildstad; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC insulation; power cable insulation; cross-linked polyethylene insulation; conductivity; dielectric losses; space charge; HVDC isolation; kraftkabel isolation; tvärbunden polyeten isolationsmaterial; elektrisk ledningsförmåga; dielektriska förluster; rymdladdning; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Since its first introduction in 1998, extruded direct current (DC) cable technology has been growing rapidly leading to many cable system installations with operation voltages up to 320 kV. Cable manufacturers invest heavily on technology development in this field and today extruded DC cable systems for operation voltages as high as 525 kV are commercially available. LÄS MER

  5. 4. Characterization of Conduction and Polarization Properties of HVDC Cable XLPE Insulation Materials

    Författare :Hossein Ghorbani; Hans Edin; Gilbert Teyssedre; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC insulation; power cable insulation; cross-linked polyethylene insulation; conductivity; dielectric losses; space charge; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : High voltage direct current (HVDC) cables with extruded insulation system were introduced in 1998. Since then this technology has been growing rapidly with many installations that are today operational at voltages up to 320 kV. LÄS MER

  7. 5. 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