Task id9758
The working fluid in the Carnot cycle is air, whose mass is m = 7.25 kg. State 1 is characterized by the parameters p1 = 21 • 105 Pa and T1 = 505.4 K, and state 3 by the parameters p3 = 2.67 • 104 Pa and T3 = 252.7 K Determine: a) useful work performed in 1 cycle; b) changes in the entropy of the heater and refrigerator; c) efficiency.
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