57. Steam leaves an industrial boiler at 827.4 kPa and 171.6°C. A portion of the steam is passed

through a throttling calorimeter and is exhausted to the atmosphere when the calorimeter

pressure is 101.4 kPa. How much moisture is leaving the boiler container if the temperature of

the steam at the calorimeter is 115.6°C?

@ 827.4 kPa and 171.6°C: hf = 727.25 kJ/kg hfg = 2043.2 kJ/kg

@ 101.4 kPa and 115.6°C: h2 = 2707.6 kJ/kg

A. 3.78%

B. 3.08%

C. 4.56%

D. 2.34%