Consider an old house (from 1858) with walls constructed of 2 inch hardwood planks, 0.5 inch lapped wood siding with 0.5 inch sheetrock on the inside. The size of the house is 40 ft wide, 26 ft long and 9 ft tall. Assume a flat roof covered with 1 inch plywood, asbestos shingles and 3.5 inches of fiberglass insulation. Assume 25% of the walls are covered with single pane windows. This old has is very leaky and has 3 exchanges per hour (k value). Assume no losses through the floor. The outside temperature is 46 degrees F cooler than the inside temperature. Considering only conductive heating losses, calculate the heating needs in BTU/hr.
Select one:. a. 2.1e4 b. 6.0e4 c. 3.8e4 d. 3.3e4