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. An office in the Lanchester building is 6 m by 4 m, and 3 m high. It is on a corner with two outside walls, and the longer wall has a single-glazed window the full length and 2 m high. The two outside walls overhang the floor below by 1.5 m. Assuming no heat exchange with the rest of the building, estimate the power required to maintain the office at 20ºC when the outside temperature is 7ºC. (Uwalls = Ufloors = 0.6 Wm-2K-1, Uwindows = 5.5 Wm-2K-1)
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