P1b
- Created by: Joanna
- Created on: 01-01-12 18:42
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P1b - Keeping houses warm
Conductors and Insulators
Metals are good conductors
Non-metals are good insulators
Air is a good insulator because the particles are very far apart
Saving energy in the home
^Through conduction, convection and radiation
CONDUCTION = TRANSFER OF THERMAL / ELECTRICAL ENERGY WITHOUT MOVEMENT
CONVECTION = TRANSFER OF HEAT ENERGY WITH THE MOVEMENT OF PARTICLES
RADIATION = ELECTROMAGNETIC WAVES / PARTICLES EMITTED BY A RADIOACTIVE SUBSTANCE
Payback time
Payback time = cost of installing insulation / Annual saving
Cavity Wall Insulation
An outer wall + an inner wall with a layer of air in between.
Heat passes through the wall by conduction. This heats the…
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