   # A heat pump has a coefficient of performance equal to 4.20 and requires a power of 1.75 kW to operate. (a) How much energy does the heat pump add to a home in one hour? (b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance? ### Physics for Scientists and Enginee...

9th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305116399

#### Solutions

Chapter
Section ### Physics for Scientists and Enginee...

9th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305116399
Chapter 22, Problem 22.12P
Textbook Problem
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## A heat pump has a coefficient of performance equal to 4.20 and requires a power of 1.75 kW to operate. (a) How much energy does the heat pump add to a home in one hour? (b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance?

(a)

To determine

The energy that a heat pump adds to a home in an hour.

### Explanation of Solution

The Coefficient of Performance of a heat pump is 4.20 and the power required to operate is 1.75kW.

Write the formula to calculate the heat added by the pump

Qh=COP×P×t

Here, Qh is the energy added, P is the power, t is the time and COP is the coefficient of performance

Conclusion:

Substitute 4.20 for COP, 1

(b)

To determine

The Coefficient of performance of the heat pump when it is reversed.

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