Building Heat Balance Flashcards
What are the three mechanisms of heat transfer in buildings?
The three mechanisms of heat transfer in buildings are conduction, convection, and radiation.
What factors affect heat exchange in buildings?
Factors that affect heat exchange in buildings include insulation of the building shell, exposed area of the building shell, and air change rate.
What is thermal resistance?
Thermal resistance is the ratio of the temperature difference between the two faces of a material to the rate of heat flow per unit area.
What is the impact of insulation on heat transfer?
Insulation reduces the rate of heat transfer by increasing thermal resistance.
What is the U-value?
The U-value is the rate of transfer of heat through a structure divided by the difference in temperature across that structure.
What is the R-value?
The R-value is the thermal resistance of a building material, which is the ability of the material to resist heat flow.
What is air infiltration?
Air infiltration is the uncontrolled and unintentional air flow into a building through cracks and inappropriately fitted doors and windows.
What is natural ventilation?
Natural ventilation is the controlled and intentional flow of air into a building through windows for the purpose of maintaining thermal comfort and healthy indoor environments.
What should be considered in the design of a building in regard to heat transfer?
Design considerations for heat transfer in buildings include U-value/R-value (insulation), exposed area of the building envelope, and air change rate.
What are the different types of dwelling and their exposed surfaces?
Detached houses have 100% exposed surfaces, semi-detached houses have 81%, terrace houses have 63%, and flats on the middle story have 32%.
