Engineering
Engineering, 07.11.2019 03:31, loveoneonly9153

We propose to heat a house in the winter with a heat pump. the house is to be maintained at 20 c at all times. when the ambient temperature outside drops to -10 c, the rate at which heat lost from the house is estimated to be 25 kw. what is the minimum electrical power required to drive the heat pump?

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Engineering, 06.07.2019 04:10, trist22
An inventor claims to have developed a reversed heat engine (ie. a heat pump) which is able to deliver 10 kj heat into the room at 20°c from outside ambient temperature of -10°c by consuming only 2 kj electricity in winter. this claim is a)-impossible b)-possible only if the heat pump is ideal c)-practically possible d)-unable to be assessed as it depends on the working fluid used in the heat pump.
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Engineering, 11.07.2019 02:20, idalieramirez8517
Aheat pump cools a house at 20-c when the maximum outside temperature is 34°c. the house gains 0.7 kw per degree temperature difference from the ambient, and the heat pump's cop is 70% of the theoretical maximum. find the minimum power input of the heat pump for which it provides sufficient cooling.
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Engineering, 03.09.2019 19:30, alexanderickh1
Acarnot heat pump is to be used to heat a house and maintain it at 25°c in winter. on a day when the average outdoor temperature remains at about 2°c, the house is estimated to lose heat at a rate of 55,000 kj/h. if the heat pump consumes 4.8 kw of power while operating, determine (a) how long the heat pump ran on that day; (b) the total heating costs, assuming an average price of $0.11/kwh for electricity; and (c) the heating cost for the same day if resistance heating is used instead of a heat pump.
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