A refrigerator door has a height and width of H1 m

Chapter 9, Problem 9.31

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A refrigerator door has a height and width of H?1 m andW?0.65 m, respectively, and is situated in a large roomfor which the air and walls are at T??Tsur?25?C.The door consists of a layer of polystyrene insulation(k?0.03 W/m?K) sandwiched between thin sheets ofsteel (?0.6) and polypropylene. Under normal operat-ing conditions, the inner surface of the door is maintainedat a fixed temperature of Ts,i?5?C. (a) Estimate the heat gain through the door for theworst case condition corresponding to no insulation(L?0).(b) Compute and plot the heat gain and the outer sur-face temperature Ts,oas a function of insulationthickness for 0L25 mm.

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