Air at 10 bars, 400 K expands to a pressure of 4 bars and subsequently passes through a heat exchanger where it cools to 295 K with negligible pressure losses. The ambient is also at 295 K. a) If the expansion process is achieved via a throttling valve, determine the rate of entropy generation for the combined valve-heat exchanger system assuming that the heat rejection is occurring at ambient temperature value. b) What is the entropy generation rate and the net work output (in KW) if the throttling valve is replaced by an isentropic turbine?

Air at 10 bars, 400 K expands to a pressure of 4 bars and subsequently

1.	Air at 10 bars, 400 K expands to a pressure of 4 bars and subsequently passes through a heat exchanger where it cools to 295 K with negligible pressure losses. The ambient is also at 295 K. a) If the expansion process is achieved via a throttling valve, determine the rate of entropy generation for the combined valve-heat exchanger system assuming that the heat rejection is occurring at ambient temperature value. b) What is the entropy generation rate and the net work output (in KW) if the throttling valve is replaced by an isentropic turbine?
Answer» UFF uff i can't ANSWER i am too WEAKER in MATHEMATICS

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