A room is represented by the following enclosure, where the ceiling (1) has an emissivity of 0.8 and is maintained at 40?C by embedded electrical heating elements. Heaters are also used to maintain the floor (2) of emissivity 0.9 at 50?C. The right wall (3) of emissivity 0.7 reaches a temperature of 15?C on a cold winter day. The left wall (4) and end walls (5A) and (5B) are very well insulated. To simplify the analysis, treat the two end walls as a single surface (5). Assuming the surfaces are diffuse and gray, find the net radiation heat transfer from each surface.

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10 m (58 4 m 2. SA)