HW15 - pump. She has determined the minimum heat transfer...

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Spring 2006 1 ME 201 Thermodynamics Homework 15 Due Friday, 3/24/2006 1. A Carnot heat engine produces power of 2.5 kW. It rejects heat to a river that is flowing at 2 kg/s, resulting in a temperature increase of 2 ° C. The average temperature of the river is 20 ° C. Determine (a) the heat transfer input required for the heat engine (b) the efficiency of the heat engine (c) the temperature at which heat transfer occurs to the engine 2. A retired engineer living in Arizona is attempting to heat her home by using a heat
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Unformatted text preview: pump. She has determined the minimum heat transfer rate needed to heat her home to be 50 kJ/h. She has the opportunity to purchase a heat that has a COP of 5 and required 2.75 W of electric power to run. Should she buy this heat pump? If the inside of the house is to be maintained at 70 F and the average low outside temperature is 40 F, how does the performance of the actual heat pump compare with the maximum possible performance?...
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