8-149 A house is maintained at 25°C in winter by electric resistance heaters. If the outdoor tem - Themodynamics Cengel & Boles 5th edition

8-149 A house is maintained at 25°C in winter by electric resistance heaters. If the outdoor temperature is 2°C, the second-law efficiency of the resistance heaters is a) 0% b) 7.7% c) 8.7% d) 13% e) 100%


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