Outside air is to be mixed with interior air, and then sent through a cooling and dehumidifying system whose cooling coil acts as the evaporator of a vapor-compression refrigeration cycle. The outside air has a temperature of 28°C and a relative humidity of 60%. The interior air to be mixed with the outside air has a temperature of 24°C and a relative humidity of 35%. The mixed stream is to be returned to the space at a temperature and relative humidity of 20°C and 50%, at a volumetric flow rate of 5 m3/s. All pressures of the moist air streams are 1 atm. The vapor-compression refrigeration cycle uses R-134a, and the R-134a exits the evaporator as a saturated vapor at 200 kPa and exits the condenser as a saturated liquid at 1000 kPa. The isentropic efficiency of the compressor is 0.78. Plot the power consumed by the compressor as a function of the fraction of the interior air used in the mixing (from 0% to 100% interior air).
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