An 8-foot high, uninsulated basement wall has 1-foot extended above ground level. The basement air temperature is 55°F, the average outside air temperature is 45°F, and the average ground surface temperature is 35°F during a cold 31-day month in winter. Estimate the total heat loss per square foot [Btu/ft²] through the basement wall during the month. Position on Wall At [days/mon] => 31 744 Tground surface 35°F => At [hr/month] => Toutside air => 45°F 55°F Tbasement air => AT => 20°F Month Exposed to OA Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 0-1 ft Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 1-2 ft Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 2-3 ft Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 3-4 ft Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 4-5 ft Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 5-6 ft Qwall [Btu/ft²] => Uwall => Btu/ft² hr °F Qwall [Btu/ft²-hr] => 6-7 ft Qwall [Btu/ft²] =>

Fig: 1