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Unformatted text preview: Solution of Homework 6 6-42 The COP and the power input of a residential heat pump are given. The rate of heating effect is to be determined. Assumptions The heat pump operates steadily. Analysis Applying the definition of the heat pump coefficient of performance to this heat pump gives kJ/s 3.2 = = = = kW 3.2 ) kW 2 )( 6 . 1 ( COP in net, HP W Q H & & 6-44 The cooling effect and the COP of a refrigerator are given. The power input to the refrigerator is to be determined. Assumptions The refrigerator operates steadily. Analysis Rearranging the definition of the refrigerator coefficient of performance and applying the result to this refrigerator gives kW 3.85 = = = 1.3 kW 5 COP R in net, L Q W & & 6-86 An inventor claims to have developed a heat engine. The inventor reports temperature, heat transfer, and work output measurements. The claim is to be evaluated. Analysis The highest thermal efficiency a heat engine operating between two specified temperature limits can have is the Carnot efficiency, which is determined from...
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- Spring '06
- Heat, Heat engine, Heat Pump