A vapor-compression refrigeration cycle is to provide the heat removal mechanism for the cooling coils described in Problem 1. The refrigerant used in the system is R-134a. The evaporator pressure is 210 kPa and the condenser pressure is 1200 kPa. 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 1
Hot, humid air at 30°C and 60% relative humidity enters a cooling and dehumidifying device at a mass flow rate of dry air of 2.5 kg/s. After passing over the cooling coils, the saturated air is heated to 22°C and a relative humidity of 30%. The air pressure is 1 atm. Determine the heat transfer rates through the cooling coils and the heating element, and determine the rate of condensed water leaving the system.
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