A straight rectangular fin has a length of 3.5 cm and a thickness of 1.4 mm. The thermal conductivity is 55 W/m middot degree C. The fin is exposed to a convection environment at 20 degree C and h = 500 W/m^2 middot degree C. Calculate the maximum possible heat loss for a base temperature of 150 degree C. What is the actual heat loss for this base temperature? 4641, 1140; If h = 68 W/m^2 middot degree C. Calculate the maximum possible heat. What is the actual heat loss? 631.2, 380.8

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explanation:

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A Carnot heat engine receives heat from a reservoir at 900$^\circ{}$C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27$^\circ{}$C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5$^\circ{}$C and transfers it to the same ambient air at 27$^\circ{}$C. Determine (a) the maximum rate of heat removal from the refrigerated space and (b) the total rate of heat rejection to the ambient air. Answers: (a) 4982 kJ/min, (b) 5782 kJ/min