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PROBLEM 5.50 An inventor has developed a refrigerator capable of maintaining its freezer compartment at 20°F while operating in a kitchen at 70°F, and claims the device has a coefficient of performance of (a) 10, (b) 9.6, (c) 4. Evaluate the claim in each of the three cases. ANALYSIS: BMAX = Tc (a) B=10. Not a valid claim. less than 9.6 480°R = 9.6 (b) Claim allowed law of thermodynamics only if the cycle can operate reversibly. (c) B=4. Claim allowed by second law.