Evaluation of savings from insulation and draught-proofing
Assumptions
Annual degree days
Boiler efficiency
Example 1: improvement of insulation
Original U value
reduced to
W/m
2
K
Treated area
m
2
Reduction in heat loss rate:
x 0.024 =
kWh per degree day
Hence annual fuel saving:
Example 2: reducing air exchange rate
Original air-change rate
reduced to
per hour
Building volume
m
3
Reduction in heat loss rate:
x 0.024 =
kWh per degree day
Hence annual fuel saving:
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