Vol. 2, Issue 10 (2015)
Heat and mass transfer analysis and optimization of direct evaporative cooling system
Author(s): Suvarna V Mehere, RD Gorle, SV Prayagi
Abstract: The phenomenon of evaporative cooling is a common process in nature, whose applications for cooling air are being used since the ancient years. In fact, it meets this objective with low energy consumption, being compared to the primary energy consumption of other alternatives for cooling, as it is simply based in the phenomenon of reducing the air temperature by evaporating water on it. The fundamental governing process of evaporative cooling is heat and mass transfer due to the evaporation of water. This process is based on the conversion of sensible heat into latent heat. While changes in sensible heat affect temperature, it does not change the physical state of water. Conversely, latent heat transfer only changes the physical state of a substance by evaporation or condensation. This change of phase requires latent heat to be absorbed from the surrounding air and the remaining liquid water. As a result, the air temperature decreases and the relative humidity of the air increase. The maximum cooling that can be achieved is a reduction in air temperature to the wet-bulb temperature (WBT) at which point the air would be completely saturated. Accordingly, the proposed research envisages the design of evaporative cooling system, to find cooling capacity, to find cooling efficiency/saturation efficiency, optimization of influence parameter such as air flow rate, No. of cooling pads, water flow rate etc.