3.8 Flashcards
Heat energy is transferred in ________ by conduction
Solids
Hot objects radiate energy _______ than cooler objects
More quickly
Black matt objects radiate _______ energy in a given time than white shiny objects
More
Conduction
The transfer of heat energy through a substance (metal) without the substance moving
Convection
The transfer of heat energy by gases or liquids moving
Radiation
Hot objects amit heat energy by this
Material for minimising heat loss
Window frame
Wood or PVC
Material for minimising heat loss
Wall
Cavity wall
Material for minimising heat loss
Window
Double glazing
Material for minimising heat loss
Roof
Thatch
What is u value?
The measure of the rate of heat loss through a material
Payback time =
Annual savings
Efficient
Wastes very little energy
Cost effectiveness
Costa less to install than the savings it generates
what is greenhouse gases caused by
pollution in the atmosphere
