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 150 kPa and the condenser pressure is 1000 kPa. Plot the power required by the compressor of the refrigeration cycle as a function of the isentropic efficiency of the compressor, with the range of isentropic efficiencies considered to be between 0.40 and 1.0.
Problem
Moist air at atmospheric pressure and a volumetric flow rate of 3.5 m3/s enters a cooling and dehumidifying system at 25°C and a relative humidity of 90%. The air exits the system at 20°C with a relative humidity of 25%. 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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