Consider a vertical 2-m-diameter cylindrical furnace whose surfaces closely approximate black surfaces. The base, top, and side surfaces of the furnace are maintained at 400 K, 600 K, and 900 K, respectively. If the view factor from the base surface to the top surface is 0.2, the net radiation heat transfer from the bottom surface is
(a) -93.6 kW
(b) -86.1 kW
(c) 0 kW
(d) 86.1 kW
(e) 93.6 kW
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