Saturated liquid ammonia at 1100 kPa passes through a throttle plate that reduces the pressure to nearly atmospheric. The temperature of the exiting ammonia is nearest:
A) ?19ºC
B) ?22ºC
C) ?28ºC
D) ?34ºC
D) ?34ºC
Search for a temperature at which the pressure is close to 1100 kPa. It is 28ºC. At this temperature (and pressure) the enthalpy is 313 kJ/kg. After the throttle, the pressure is 100 kPa (i.e., atmospheric) which occurs at a temperature entry of ?33.8ºC. The enthalpy remains constant across the throttle so h2 = 313 kJ/kg. The quality could be found, if desired, to be
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