SpecialProblems23-25

SpecialProblems23-25 - Special Problems for ME 200 Fall...

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Special Problems for ME 200 – Fall 2011 Special Problems 23, 24, and 25 Due Friday, October 28, 2011 SP23: An irreversible heat pump removes heat from the surroundings at 7 C and supplies heat to an industrial process at 147 C at the rate of 43,200 kJ/hr. The COP of the heat pump is 60% of an internally reversible heat pump operating between the same two temperatures. The heat pump is driven, through a transmission which has an efficiency of 80%, by the output of an irreversible heat engine. The heat engine receives heat from a source at 777 C and rejects heat to the industrial process at 147 C. The thermal efficiency of the heat engine is 75% of an internally reversible heat engine operating between the same two temperatures. (a) Calculate the heat input (kW) to the heat engine from the source at 777 C. (b) What is the total rate of heat transfer (kJ/hr) supplied to the process at 147 C? SP24:
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