Heating and cooling Flashcards
1
Q
Name the three ways radiation can be transferred from place to place.
A
Conduction, convection and radiation.
2
Q
Conduction
A
The transfer of heat energy through a material, without the material itself moving.
3
Q
Convection
A
The transfer of heat energy through a moving liquid or gas.
4
Q
Radiation
A
Electromagnetic radiation emitted from a hot object.
5
Q
What type of surface is best to reflect and absorb radiation?
A
Dark and matt (dull).
6
Q
What type of surface not good to reflect and absorb radiation?
A
Light and shiny.
7
Q
What is the formula for energy?
A
energy = mass x specific heat capacity x change in temperature
8
Q
What type of radiation do all hot objects emit?
A
Infra-red radiation
9
Q
What is the formula for payback time?
A
payback time = initial cost / annual saving
