7-165 Helium gas is throttled steadily from 500 kPa and 70°C. Heat is lost from the helium in the amount of 2.5 kJ/kg to the surroundings at 25°C and 100 kPa. If the entropy of the helium increases by 0.25 kJ/kg . K in the valve, determine a) the exit pressure and temperature and b) the entropy generation during this process. | |
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