The Experimental Investigation of Performance of Two-Stage Evaporative Cooling System

In this study, the performance of two-stage evaporative cooling system is evaluated under different conditions of temperature and flow of air and water inside the heat exchanger. For this purpose, a two-stage evaporative cooling system was designed and manufactured. In this system, the environment air is pre-cooled in the heat exchanger, before it enters the direct evaporative pad. The air is pre-cooled with cold water. This water is cooled by a compressive cooling system. With attention to compressive cooling system, it is possible to reduce the cold water temperature of the heat exchanger to less than the wet bulb temperature of the ambient air. The analysis of the results shows that, it is possible to reduce the outlet air temperature from the system to less than the wet bulb temperature of inlet air. In this system, the reduction of the water temperature in the heat exchanger and airflow in the system can increase the system effectiveness. The increase of water flow in the heat exchanger will increase the efficiency and reduce the outlet air temperature. Compared to the compression cooling system, the use of this two-stage cooling system can save up to 59% of