Reconsider Prob. 17–157. It is desired to insulate the wall in order to decrease the heat loss by 85 percent. For the same inner surface temperature, determine the thickness of insulation and the outer surface temperature if the wall is insulated with (a) polyurethane foam (k = 0.025 W/m · °C) and (b) glass fiber (k = 0.036 W/m · °C).
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