12.33 As shown in Fig.

P12.33, moist air at 30°C, 2 bar,

and 50% relative humidity

enters a heat exchanger

operating at steady state with a

mass flow rate of 600 kg/h and

is cooled at constant pressure to

20°C. Ignoring kinetic and

potential energy effects,

determine the rate of heat

transfer from the moist air

stream, in kJ/h.