A small disk of diameter D1 50 mm and emissivity 1 0.6 is
Chapter , Problem 13.83(choose chapter or problem)
A small disk of diameter D1 50 mm and emissivity 1 0.6 is maintained at a temperature of T1 900 K. The disk is covered with a hemispherical radiation shield of the same diameter and an emissivity of 2 0.02 (both sides). The disk and cap are located at the bottom of a large evacuated refractory container (4 0.85), facing another disk of diameter D3 D1, emissivity 3 0.4, and temperature T3 400 K. The view factor F23 of the shield with respect to the upper disk is 0.3. Cold s (a) Construct an equivalent thermal circuit for the above system. Label all nodes, resistances, and currents. (b) Find the net rate of heat transfer between the hot disk and the rest of the system.
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