Paper Title
EFFICIENCY ANALYSIS OF DIRECT STAGE AND TWO-STAGE EVAPORATIVE AIR COOLER

Abstract
Evaporative coolers are used in various areas especially in dry, hot climates in weather. This research focus on the theoretical and experimental result of the evaporative air cooler. There are three types of evaporative air coolers. They are direct evaporative air cooler, indirect evaporative air cooler and two-stage evaporative air cooler. Evaporative air cooler can provide summer comfort conditions as an environmentally clean, fresh supply air and energy efficient cooling system for some regions of our country where direct system alone is not suitable. In this paper, the tube type heat exchanger was used ad the tubes are made with copper and water is passed through the copper tube with 25˚C. This model then has been adapted for indirect and direct stages. Therefore, the cooling capacity of two-stage is 2.95 kW and direct stage is 2.65 kW. Therefore, the cooling efficiency of two-stage is 24% more than the direct stage evaporative air cooler. So, two-stage evaporative air cooler was performed more than direct stage evaporative air cooler. Keywords - Two-Stage Evaporative Air Cooler, Staggered Tube, Cellulose Media Pad, Cooling Capacity, Efficiency.