Performance Test of Indirect-Direct Two Stage Evaporative Cooler Based Water Sprayer with Primary Air Velocity Variation

Abstract

Evaporative Cooler (EC) is an air conditioning device that have advanteges compared to device using refrigeration cooling system like low energy use, simply manufactured and environmental friendy (not using CFC/ Chlorofluorocarbon). EC is compatible to cool buildings in hot and dry regions. But, one of the EC type, indirect-direct two-stage evaporative cooler, is wider in use (more humid regions) and have better effectivity. Indonesia is country that have wide variety of ambient air condition like hot, cold, dry and humid. This study will present the planning, making and testing experimentally performance indirect-direct two-stage evaporative cooler using water sprayer in Indonesia. Moreover, this study uses variation of primary airflow fan speed 33, 66 and 100%. The result is highest performance that achieved is in the primary airflow fan speed 33% which provided 101% effectivity that change condition of air from 33.0°C and 58.7% RH to 26,1°C and 94.7% RH.