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A heated building is built on a concrete slab with dimensions of 50 x 100 ft (15 x 30 m). The slab is insulated around the edges with 1.5 in.

(40 mm) expanded polystyrene, 2 ft (0.61 m) in width. The outdoor design temperature is 10 F (-12 C). Estimate heat loss from the floor slab.

Fig: 1