ENHANCEMENT OF COOLING EFFICIENCY OF AN EVAPORATIVE COOLING SYSTEM

Abstract

Now a day our. country is facing a major problem of energy shortage. Energy consumption for the cooling through an AC is many times high in comparison to that in an evaporative cooling system. The evaporative coolers with high effectiveness can also be useful in the humid environment. The role of cooling pad in direct evaporative cooling system (DEC) is very significant. In the present work the effects of the pad characteristics, pad shape, out side air temperature, air flow velocity from fan on the effectiveness of air cooler has been studied. For this an experimental set up has been fabricated in the laboratory and experiment has been carried out. Here ordinary pad and cellulose pad with cross flute have been used. Also the. experiments have been carried out over rectangular and circular pad at three different velocities. The detail descriptions of experimental set-up, various measuring instruments and various cooling pads have been reported. From the experiment it has been found that cooling effectiveness increases with the out side air temperature and with the increase of pad thickness. Cellulose pad is more effective than the ordinary pad and this pad is mainly effective at high air flow velocity. Also rectangular pad has more cooling effectiveness than that of rectangular pad. Also when cold air coming from the cooler through suction fan then a certain amount of heat is added to air