Plot the irreversibility per kg of R-134a for the conditions of the throttling valve outlined in Problem 33 (b), with an ambient temperature of 25°C.
Problem
R-134a enters an adiabatic throttling valve as a saturated liquid at 1200 kPa. The R-134a expands to 150 kPa. (a) What is the exit quality and the entropy generation per kg of R-134a for the process? (b) Plot the exit quality and entropy generation per kg of R-134a for exit pressures ranging between 100 kPa and 1000 kPa.
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