Saturated ammonia at 120 kPa is compressed to 1200 kPa by the insulated compressor of Fig. 6.55.

Question:

Saturated ammonia at 120 kPa is compressed to 1200 kPa by the insulated compressor of Fig. 6.55. Neglect any losses and determine the horsepower requirement if 40 kg passes through the compressor each minute. What is the entropy change of the universe due to this compression process if the surroundings are at 20ºC?
Figure 6.55