Determine the rate of heat transfer between two 1 by 1 m parallel flat plates placed 0.2 m apart and connected by re-radiating walls. Assume that plate 1 is maintained at 1500 K and plate 2 at 500 K.(a) Plate 1 has an emissivity of 0.9 over the entire spectrum and plate 2 has an emissivity of 0.1.(b) Plate 1 has an emissivity of 0.1 between 0 and 2.5 μ m and an emissivity of 0.9 at wavelengths longer than 2.5 m m, while plate 2 has an emissivity of 0.1 over the entire spectrum.(c) The emissivity of plate 1 is the same as in part (b), and plate 2 has an emissivity of 0.1 between 0 and 4.0 μ m and an emissivity of 0.9 at wavelengths larger than 4.0 μ m.GIVENTwo parallel flat plates connected by re-radiating wallsPlates dimensions: 1 m x 1 mDistance between plates (s) = 0.2 mPlate temperaturesT1 = 1500 KT2 = 500 KASSUMPTIONSConvective heat transfer is negligibleThe re-radiating surface is graySteady stateconditions

Transcribed Image Text:

T = 1500 K A = A, = A2 = 1 m2 AR A2, 82 T2- 500 K 0.2 m 1 m -