1, Two parallel disks, 80 cm in diameter, are separated by a distance of 10 cm and completely enclosed by a large room at 20°C. The properties of the surfaces are T1 = 620°C, e, = 0.9, T2= 220°C, e2= 0.45. What is the net radiant heat %3D %3D transfer with each surface? (Do not include back side exchange, only that from the surfaces facing each other.)

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