Monday, November 03, 2008

TE 303 - HW #6, P7 - Carnot HE Used to Drive a Carnot Refrigerator - 10 pts

A Carnot Heat Engine receives heat from a reservoir at 900oC at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27oC. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5oC and rejects heat to the same ambient air at 27oC. Determine:

a.) the maximum rate of heat removal from the refrigerated space
b.) the total rate of heat rejection to the ambient air

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1 comment:

Anonymous said...

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HINTS:
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* Note that the maximum amount of heat will be removed when BOTH the HE and REF operate on reversible thermodynamic cycles.

* You can assume that all of the work produced by the HE will drive the REF.

* Solution requires careful application of the First Law.

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ANSWERS:
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a) Q_C = 4989 kJ/min

b) Q_out = 5789 kJ/min