The surface of a radiation shield facing a black hot wall
Chapter 13, Problem 13.119(choose chapter or problem)
The surface of a radiation shield facing a black hot wall at 400 K has a reflectivity of 0.95. Attached to theback side of the shield is a 25-mm-thick sheet of insu-lating material having a thermal conductivity of0.016 W/m?K. The overall heat transfer coefficient(convection and radiation) at the surface exposed to theambient air and surroundings at 300 K is 10 W/m2?K. (a) Assuming negligible convection in the regionbetween the wall and the shield, estimate theheat loss per unit area from the hot wall.(b) Perform a parameter sensitivity analysis on theinsulation system, considering the effects ofshield reflectivity, ?s, and insulation thermalconductivity, k. What influence do these parame-ters have on the heat loss from the hot wall?What is the effect of an increased overall coeffi-cient on the heat loss? Show the results of youranalysis in a graphical format
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