Abstract
Evaporative cooling phenomenon yields a cooling and humidification process widely used in AC applications to maintain thermal comfort in the space. Present work deals with the design & construction of a dynamic humidifier that operates on the centrifugal action principle. Celdek pad is positioned inside a frame that holds the water effectively and later dispersed in the air. Heat & mass transfer mathematical model is constructed and parameters such as evaporation rate, cooling efficiency, cooling effect, coefficient of performance, specific humidity at the exit and exit temperatures are determined and validated with empirical values. Maximum Humidification efficiency of 82%, cooling effect of 3061 W and rate of evaporation of 0.82 g/s have been noticed from the experiments. Both Experimental and theoretical results agree with a maximum deviation of 8%. Also, it is found that packing in dynamic action gave maximum humidification performance compared to the stationary type except for coefficient of performance. Motor shaft speed of 150–160 rpm and the air velocity of 6.5 to 7 m/s yielded optimum results.
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