Air at 32°C and 75% humidity is to be conditioned to 24°C and 50% humidity. The heat transfer required to reduce the moisture content to the desired amount is nearest:
A) 42 kJ/kg
B) 47 kJ/kg
C) 53 kJ/kg
D) 58 kJ/kg
C) 53 kJ/kg
Locate the initial state at 32°C and 75% humidity. The enthalpy at the state is read (an interpolation may be necessary) to be close to 90 kJ/kga. Now locate the final state at 24°C and 50% humidity. To find the enthalpy needed for the heat transfer requested, go left on a constant-? line (a horizontal line, not up on an angle. See the H-I process in Fig. 11.15) and observe that the enthalpy is approximately 37 kJ/kg. The heat that must be transferred from the air is found to be
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