Consider the three-surface enclosure shown. The lower plate (A₁) is a black disk of 200-mm diameter and is supplied with a heat rate of 10,000 W. The upper plate (A₂) a disk coaxial to A J, is a diffuse gray surface with ?₂ = 0.8 and is maintained at T₂ = 473 K. The diffuse, gray sides between the plates are perfectly insulated. Assume convection heat transfer is negligible. Determine the operating temperature of the lower plate T₁ and the temperature of the insulated side T₃.

Transcribed Image Text:

D-0.2 m A. T= 473 K. e 0.8 L= 0.2 m A T, insulated A. T. black surface P= 10,000 w