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THERMODYNAMICS PRACTICE PROBLEMS 1.

THERMODYNAMICS PRACTICE PROBLEMS . 1. A Carnot refrigerator has a coefficient of performance of 10. If the refrigerator's interior is to be kept at 45 C, the temperature of the refrigerator's high temperature reservoir is most nearly (A) 250K. (B) 270K. (C) 300K. (D) 350K. Solution For a refrigerator, Tlow COP =. Thigh Tlow Solve for the hot side temperature. Tlow 45 C + 273. Thigh = + Tlow = + ( 45 C + 273). COP 10. = Answer is (A). 2. Helium is compressed isentropically from 1 atmosphere and 5 C to a pressure of 8. atmospheres. The ratio of specific heats for helium is 5/3. What is the final temperature of the helium?

A Carnot refrigeration cycle is used to keep a freezer at –5°C. Heat is rejected at 20°C. If the heat removal rate is 30 kW, the COP of the refrigeration cycle is most nearly (A) 9 (B) 10 (C) 11 (D) 12 Solution Thigh =°+ =20 C 273 293K Tlow =− ° + =5 C 273 268K

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