Experimental Investigation of the Humidification Parameters in a Vertically Aligned Triple Pad Multistage Evaporative Cooler

Abstract

The present work involves designing and fabricating the threestage humidifier test rig where three Celdek 7090 packings are arranged vertically at equidistance, forming a multistage humidifier. Water flowrate and airflow rates are regulated to obtain required humidification under both singlepad and threepad configurations. Output variables like the coefficient of performance, evaporation rate, cooling effect, cooling efficiency, and pressure drop are determined. Results indicated that threestage packing gave high performance compared to the single stage. Changes in temperature, change in humidity, saturation efficiency, and coefficient of performance values are 6.5 °C, 44%, 80%, and 2.1, respectively, are the maximum values noticed for the multistage humidifier. The study indicated that with the increase in the rate of water flow, there is a rise in performance parameters till a water flowrate of 0.6 l per minute, and after this value, performance deteriorates. Even though multistage performs better than a single stage, as the number of stages increases, the stagewise performance declines.