Energy efficiency in the home Flashcards
What is the equation for payback time
Payback time = Initial cost
/ annual saving
What are the most effective methods of insulation
The ones that give you the biggest annual saving
What is payback time
The time it takes the money you save on heating bills to equal the initial cost of installation
What are the most cost-effective methods
The cheapest
Why do methods become cost-effective
They have a short payback time
What is cavity wall insulation
Foam squirted into the gap between the bricks
What does cavity wall insulation do
Reduces convection and radiation across the gap
Pockets of air in the foam reduce heat transfer by conduction
What is loft insulation
A thick layer of fibreglass wool laid out across the loft floor and ceiling
What does loft insulation do
Reduces heat transfer from the house by conduction and convection
What is draught-proofing
Strips of foam and plastic around doors and windows stopping draughts of cold air coming in
What does draught-proofing do
Reduces heat loss due to convection
What is a hot water tank jacket
lagging such as fibreglass wool
What does a hot water tank jacket do
Reduces conduction and convection
What are thick curtains
Big thick bits of cloth over windows
What do thick curtains do
Reduces heat loss by conduction and radiation
