7-86 A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the surroundings temperature of 27°C. Assume constant specific heats at 300 K. a) Determine the entropy change of the air in the tank during the process, in kJ/K, b) determine the net entropy change of the universe due to this process, in kJ/K, and c) sketch the processes for the air in the tank and the surroundings on a single T-s diagram. Be sure to label the initial and final states for both processes. | |
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