A blower door test on a 30 ft × 50 ft × 9 ft house located in Denver, Colorado, revealed that under a 4-Pa pressure differential between indoors and outdoors, the leakage area is about 200 in.².

a. Determine in ACH the annual average infiltration rate for the house.

b. It was decided to weather strip the house so that the infiltration is reduced to just 0.25 ACH (for a 4-Pa pressure differential). Determine the payback period of weather stripping the house given the following parameters:

Transcribed Image Text:

Heating degree-days Cooling degrees-hours Fuel cost Boiler efficiency Electric rate Refrigeration requirement Cost of weatherstripping 6,000 5,000 $5/MMBtu 0.70 $0.10/kWh 0.75kW/ton $150