Performance Analysis of Two Different Types of Local Evaporative Cooling Pads In North India

Abstract

To increase the comfort level of urban public areas during the summer period, several passive strategies can be implemented. In areas characterized by hot and dry summer days, the most common techniques for human comfort are based on solar shading, natural ventilation and evaporative processes. Evaporative coolers are widely used in India because they are economically feasible. So it is the need to make it more efficient for its better performance. The concept of improving performance or the effect of changing pads (Grass wool and honeycomb structure) is studied in Chandigarh University Gharuan, Punjab in northern region of India. Both pads are compared on the basis of wet bulb and dry bulb temperatures of air, their effectiveness, relative humidity of air, air velocity, volume of water consumed, rate of evaporation and performance of pads at different power supply by changing the power with the help of dimmer stat starting from the minimum value 80 watt and taking the step size 20 watt up to 140 watt. Running time for each step is one hour. The Power supply variation is only used to vary the speed of fan motor but not the speed of water pump motor in our experimental setup. Conditions of air entering and leaving the evaporative cooler are measured for the evaluation. The main objective of the experiment is whether there is need of changing already used grass wool pads by honeycomb structure pads or not.