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1. Loft insulation, cavity wall insulation, hot
water tank jacket, draught-proofing and curtains
are good heat insulators. What is
the main heat energy transfer do they reduce? explain.
2. How does
heat travel through a double glazed window that has a vacuum between the two
panes of glass?
3. How is
the payback time of installation of different heat insulations calculated?
4. Complete
the following table:
|
Type of insulation |
Cost
(£) |
Annual
saving (£) |
Payback
time |
|
Double glazing |
5000 |
50 |
|
|
Loft insulation |
300 |
60 |
|
|
Cavity wall insulation |
600 |
|
6
years |
|
Draught-proofing |
50 |
|
1
year |
a) Which type of heat insulation pays for itself quickly?
b) Is double glazing a cost effective method of heat insulation? explain.
c) What is the most effective method of heat insulation? explain.
5. List
three advantages of saving energy.
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