A diffuse, gray radiation shield of 60-mm diameterand
Chapter 13, Problem 13.64(choose chapter or problem)
A diffuse, gray radiation shield of 60-mm diameterand emissivities of ?2,i?0.01 and ?2,o?0.1 on theinner and outer surfaces, respectively, is concentricwith a long tube transporting a hot process fluid. Thetube surface is black with a diameter of 20 mm. The region interior to the shield is evacuated. Theexterior surface of the shield is exposed to a largeroom whose walls are at 17?C and experiences con-vection with air at 27?C and a convection heat transfercoefficient of 10 W/m2?K.Determine the operating temperature for the innertube if the shield temperature is maintained at 42?C
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