Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 15 - The Laws of Thermodynamics - Problems - Page 440: 34

Answer

$-15^{\circ}C$

Work Step by Step

The ideal/maximum coefficient of performance is given in equation 15–6c. Make sure to measure temperatures in kelvins. $$COP=\frac{T_L}{T_H-T_L}$$ $$T_L=T_H\frac{COP}{1+COP}=(295K) \frac{7.0}{1+7.0}=258K=-15^{\circ}C$$
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