Download - Energy lesson 7
REDUCING HEAT LOSSES
TargetTo know the main ways in which heat is lost
from the home
Monday, May 1, 2023
Heat loss from homes Look at the diagram
and complete the table
Part of house Heat lost per secceilingwindowsfloordraughtswall
2000 Joules1500 Joules1000 Joules
1500 Joules
4000 Joules
Heat loss from homes Look at the diagram
and complete the table
Part of house How heat is lostceilingwindowsfloordraughtswall
Conduction
Conduction
Conduction
Convection
Conduction
Heat loss saving in homes Loft insulation Air trapped in glass
fibre cuts down half heat loss through the ceiling
Heat loss saving in homes Cavity wall insulation Air trapped in fibre
cuts down heat loss through the wall
Pay back time Draught excluders Costs £25 Saves £ 50 per year Payback time = 25/ 50 = 0.5 years = 6 months
QUESTIONS
Foundation Science 1 - Pages 174 and 175Draw the diagram.
Copy and complete the summary box
The vacuum flask
Vacuum prevent conduction and convection
Silvered surfaces inside prevent radiation
Top prevents convection