Air at 30ºC and 90% humidity is conditioned to 25ºC and 50% humidity. The heat that must be added in this process is nearest:
A) 10 kJ/kga
B) 12 kJ/kga
C) 14 kJ/kga
D) 16 kJ/kga
B) 12 kJ/kga
First, identify the initial state F and the final state I. The moist warm air is cooled to the 100% humidity state (F to G). Continue to cool the air and remove moisture until state H is reached, where h = 39 kJ/kga. Heat is now added until state I is reached at 25ºC and 50% humidity, where h = 51 kJ/kga. The energy equation then is used to find
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