Two 5-ft-square and parallel flat plates are 1 ft apart. Plate A1 is maintained at a temperature

Question:

Two 5-ft-square and parallel flat plates are 1 ft apart. Plate A1 is maintained at a temperature of 1540?F and A2 at 460?F. The emittances of the plates are 0.5 and 0.8, respectively. Considering the surroundings black at 0 R and including multiple inter-reflections, determine(a) The net radiant exchange between the plates and(b) The heat input required by surface A1 to maintain its temperature. The outer-facing surfaces of the plates are adiabatic.GIVENTwo square parallel flat plates, 1 ft apartTemperature of A1 (T1) = 1540?F = 2000 RTemperature of A2 (T2) = 460?F = 920 REmittances: ε1 = 0.5 ε2 = 0.8Surroundings are black at (T3) = 0R