Parametric evaluation of dynamic multistage centrifugal humidifier

Abstract

Evaporative cooling is a passive cooling technique, which is energy efficient, sustainable, and environmentally friendly. The present work deals with the design and construction of a three-stage rotating centrifugal humidifier test rig equipped with a UV filter. Experiments are conducted varying the air velocity and the motor shaft speed. Overall cumulative performances such as DBT ratio, RH ratio, humidification effectiveness, coefficient of performance, and evaporation rate are determined with respect to Reynold’s number and stage wise. Measurements of CO 2 , Total Volatile Organic Compounds (TVOCs) and formaldehyde are performed at the exit air from the filter. Results showed maximum evaporation rate, humidification effectiveness, and coefficient of performance equal to 0.82 g s −1 , 88.74%, and 6.14, respectively. The cumulative performance improved for consecutive stages, but stagewise analysis indicated that the first stage gave a maximum performance. Exiting air quality after filtration is improved by 33%, which meets the most exigent standards in terms of the target pollutants. • Performance of a novel multistage centrifugal humidification test rig is studied. • Evaporative cooler consumes 42% less energy and saves 33% cost compared to AC unit. • Maximum humidification occurs in the first stage and reduces along stages. • Optimum values of motor speed and the Re is found to be 40 rpm and 28,949.