Effect of Ambient Relative Humidity on the Modified Evaporative Condenser

Evaporative condenser is condensing unit equipped with a sprayed water cooling. Sprayed water enhances the reduction of refrigerant temperature. The decrease of refrigerant temperature relates to the heat transfer improvement of air conditioning systems. This research aims to increase heat rejection by redesigning the condenser, using condensate water spray to a horizontal tube that connects between compressor and condenser. The effect of ambient relative humidity and air speed on refrigerant temperature is investigated in this study. The heat rejection steeply increases when the ambient relative humidity ranges from 47.8% to 73.1%. Then it remained constant until it reached 80.9%. The heat rejection was significantly reduced when the ambient relative humidity was in the range of 80.9% to 90.4%. In addition, lowering air speed and increasing ambient relative humidity reduce the convection heat transfer. Furthermore, the optimum condition for designing a model is between 73.1% to 80.9%. The most evidence, at the ambient relative humidity of 77.5%, heat absorption increases by up to 24.5%.