Answer
Increasing $T_L$ or decreasing $T_H$.
Work Step by Step
$COP_R=\dfrac{1}{1-\frac{T_L}{T_H}}$
Increasing $T_L$ or decreasing $T_H$.
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 6 - The Second Law of Thermodynamics - Problems - Page 318: 6-86C
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