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Engineering and Tech / Thermodynamics: An Engineering Approach 8 / Chapter 6 / Problem 120P

Thermodynamics: An Engineering Approach | 8th Edition | ISBN: 9780073398174 | Authors: Yunus A. Cengel, Michael A. Boles

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A Carnot heat pump is used to heat and maintain a

Chapter 6, Problem 120P

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QUESTION:

Problem 120P

A Carnot heat pump is used to heat and maintain a residential building at 75°F. An energy analysis of the house reveals that it loses heat at a rate of 2500 Btu/h per °F temperature difference between the indoors and the outdoors. For an outdoor temperature of 35°F, determine (a) the coefficient of performance and (b) the required power input to the heat pump.

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QUESTION:

Problem 120P

A Carnot heat pump is used to heat and maintain a residential building at 75°F. An energy analysis of the house reveals that it loses heat at a rate of 2500 Btu/h per °F temperature difference between the indoors and the outdoors. For an outdoor temperature of 35°F, determine (a) the coefficient of performance and (b) the required power input to the heat pump.

ANSWER:

Step 1 of 4

Part (a)

The equation for the coefficient of performance is as follows:

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