Your manager has asked you to select a heat exchanger, based solely on thermodynamic considerations, to be used to condense steam from an industrial process. The steam has a mass flow rate of 4.5 kg/s, and enters the heat exchanger as a superheated vapor at 200 kPa and 140°C. The steam is to exit at a pressure of 200 kPa, as a saturated liquid. Your two options for the heat exchanger are as follows.
Option A: An insulated heat exchanger that uses air. The air enters at 15°C and 120 kPa and exits at 110°C and 100 kPa.
Option B: An insulated heat exchanger that uses liquid water. The water enters at 20°C and exits at 50°C.
Calculate the entropy generation rate for each heat exchanger and choose the one that has the lower amount of irreversibility.
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