P1b

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  • Created by: Joanna
  • Created on: 01-01-12 18:42

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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