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 20 psia and the condenser pressure is 140 psia. Determine the power required by the compressor of the refrigeration cycle if (a) the compressor is isentropic, and (b) the isentropic efficiency of the compressor is 80%.
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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