12.50 An air conditioner

operating at steady state takes in

moist air at 28°C, 1 bar, and

70% relative humidity. The

moist air first passes over a

cooling coil in the dehumidifier

unit and some water vapor is

condensed. The rate of heat

transfer between the moist air

and the cooling coil is 11 tons.

Saturated moist air and

condensate streams exit the

dehumidifier unit at the same

temperature. The moist air then

passes through a heating unit,

exiting at 24°C, 1 bar, and 40%

relative humidity. Neglecting

kinetic and potential energy

effects, determine

a. the temperature of the

moist air exiting the

dehumidifier unit, in °C.

b. the volumetric flow rate of

the air entering the air

conditioner, in m³/min.

c. the rate water is

condensed, in kg/min.

d. the rate of heat transfer to

the air passing through the

heating unit, in kW.