A vapor-compression refrigeration cycle is to provide the heat removal mechanism for the cooling coils described in Problem. The refrigerant used in the system is R-134a. The evaporator pressure is 40 psia. The isentropic efficiency of the compressor is 0.80. Plot the power required by the compressor of the refrigeration cycle for condenser pressures ranging between 120 psia and 300 psia.
Problem
Moist air at 90°F and a relative humidity of 40% enters a cooling and dehumidifying system. The air exits the system at 70°F and 40% relative humidity. The air pressure is 1 atm, and the mass flow rate of dry air is 5 lbm/s. Determine (a) the rate at which water is condensed from the air, (b) the heat transfer rate through the cooling coils, and (c) the heat transfer rate through the heating element.
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