NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 Website: ijiert.org VOLUME 7, ISSUE 6, June-2020 154 | Page STUDY ON THE PERFORMANCE PARAMETERS OF TWO STAGE EVAPORATIVE COOLING SYSTEM ATUL JOSHI Department of Mechanical Engineering, Indira College of Engineering and Management, Pune, India atuljoshi1409@gmail.com HEMANT DAROKAR Department of Mechanical Engineering, Indira College of Engineering and Management, Pune, India hvdarokar@gmail.com ABSTRACT The Evaporative cooling systems are continuously going modifications for increased efficiency and reduced energy consumption. It is the demand of time to develop energy efficient technology as far as environmental aspects and economic dependency on unconventional sources is concerned. Due to this, the evaporative cooling systems are used for commercial cooling and humidification control of buildings, cold storages, green houses, etc. Two stage indirect/direct evaporative air cooler can provide summer comfort conditions as an environmentally clean, fresh supply air and energy efficient cooling system for the regions where direct system alone is not suitable. In this paper, the performance parameters of Indirect/Direct evaporative cooling system are studied. Effects of various operational and geometrical parameters on cooling performance of this cooling system also have been studied. Results show that indirect/direct cooling systems can provide comfort conditions, which use only water as cooling media and consume much less energy in comparison with conventional vapour compression systems. Additionaly, in certain localities having high humidity the use of evaporative cooling is having limited use. In these situations when evaporative cooling systems are used in conjuction with mechanical vapour compression systems for the precooling of the air, these systems can also have potential to save considerable amount of energy and there by the cost of operation of the equipment. INTRODUCTION The evaporative cooling technology is energy efficient and eco-friendly technology hence used in hot and dry climates. The evaporative cooling systems are classified as direct evaporative cooling (DEC) and indirect evaporative cooling (IEC) systems. Direct evaporative cooling is popular method of conditioning the atmospheric air. The direct evaporative cooling system uses fan to pass outside warm air through porous wetted pad. The heat is absorbed by the water as the water evaporates from the porous pads. The leaving air is cooled to lower temperature. Here the dry bulb temperature of incoming air gets reduced as its wetted in the adiabatic saturation process. In direct evaporative cooling, the sensible heat gets converted latent heat. Thus the direct evaporative cooling systems have two drawbacks: the moisture content of the space to be cooled increases, since water vapour is added to air; and the air can be cooled to the ambient air wet bulb temperature. Whereas in indirect evaporative cooling, non-adiabatic evaporation takes place over the wet surface heat exchanger. There are dry and wet alternate flow passages for air and are separated from each other. The product or primary air flows inside the dry flow passages and the supply or secondary air on the wet flow passages which absorbs and carries the heat of primary air. The water spray is provided for efficient wetting of the wet surface, so that there is evaporation of water in to the secondary air, which reduces the temperature of the wall. Thus, the heat is transferred from primary to secondary air without the addition of moisture in to the primary air. The resulting cooled air temperature is lower than the ambient wet bulb temperature. The direct and indirect evaporative cooling systems are efficient but there is considerable water consumption in indirect evaporative cooling.