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A detached house is built using a cavity wall, consisting of two layers of brick separated...

A detached house is built using a cavity wall, consisting of two layers of brick separated by a 50 mm air gap. A brick has a thickness of 112.5 mm. kbrick = 0.72 Wm-1K-1 , kair = 0.0262 Wm-1K-1 . The house has dimensions of width 8 m, depth 6 m and height 5 m. Assuming the roof and floor are perfectly insulated (hence most heat loss is through the walls), how much heat must the central heating system supply to maintain an internal temperature of 22 C when the outside temperature is 5 C. The answer is 1069

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