Saving Energy Flashcards
2) Things that transfer and waste energy are called…?
Sinks
1) Things that emit energy are called…?
Sources
3) To decrease the energy lost from ‘sinks’ you can…?
Insulate some objects or increase there efficiency
4) Purchasing and installing insulation as well as using more efficient appliances saves money so…?
Energy bills are lower
5) Eventually, money saved on energy bills will…?
Equal the initial cost
6) When the money saved on energy bills equals initial cost, this is called…?
Payback time
7) How do you calculate payback time?
Payback time = initial cost / annual saving
8) Repeatedly subtracting the annual saving from the initial cost results in…?
The biggest annual saving
9) Describe loft insulation
Fibreglass ‘wool’ laid across the loft floor reduces conduction through the ceiling into the roof spaces
10) Describe the function of a hot water jacket
Reduces conduction
11) Describe double glazing
Two layers of glass with an air gap between, reduces conduction
12) Describe the function of thick curtains
Reduces conduction and radiation through windows
13) Describe the function of draught proofing
Strips of foam and plastic around doors and windows that stop hot air going out-reducing convection
14) Describe the function of cavity walls and how they insulate
Two layers of bricks with a gap between them, reduces conduction but, you still get some energy lost by convection
15) How do you minimise convection in a cavity wall?
Squirt insulating foam into the gap which traps pockets of air
