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Quiz#5

# Quiz#5 - MAE 105A Winter 2009 QUIZ No 5 A heat pump is used...

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Unformatted text preview: MAE 105A Winter 2009 QUIZ No. 5 A heat pump is used to maintain a house at 25° C . At this temperature, the house loses heat to the outside (through walls, windows etc) at a rate of 60,000 kJ/h while the energy generated (by people, appliances, lights etc) within the house is 4000 kJ/h. Determine the power (in HM required for the heat pump if the COP is known to be 2.5. Draw a schematic of the heat pump and label all heat and work rates and the associated magnitudes. (20) 7A} 0 25C K .. _ — ' [4»? 59H - 69000 4000 ’ 56000 /A COP:Z-5= QH/W QH : 60,000—400°) W .1 (9H _._. 56000/3600 KI/h 2‘5 2'5 COP:2.5 W’s-22L», = 6- 22 km 072240015175 33600 LI/h CPL: 62”” W ’- .— 3 :3, 600 KI/A " ...
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