A freezer compartment consists of a cubical cavity that is 2 m on a side. Assume the bottom to be perfectly insulated. What is the minimum thickness of styrofoam insulation (k = 0.030 W/m ∙ K) that must be applied to the top and side walls to ensure a heat load of less than 500 W, when the inner and outer surfaces are -10 and 35°C?

 

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