Theoretical And Experimental Study Of The Direct Evaporative Cooling Pad

This paper took the direct evaporative cooling media as the main research objecton the base of the general mathematical calculation model of evaporative coolingequipment presented by Boris Halasz. Based on the principle of conservation ofenergy and principle of conservation of mass, we took a considering of the influenceof the system caused by the water quality change in the process of water evaporationor condensation when we built the model. We set up a mathematical calculation modelof direct evaporative cooling (DEC) media by adopting micro element method thatdescribed in detail in the process of inner relation of air and water contact which weremore tally with the actual situation. On this basis, respectively, contrast Boris Halaszoriginal model calculated results and experimental results verify the accuracy of thecalculation model.In the non-circulating water under the conditions of use of the differentialEquations solve the downstream and upstream channel of the pad, and to investigatethe distribution of the internal temperature of the pad. Under the conditions of thecirculating water, using the model to calculate the value of the outlet dry bulbtemperature with a pad material in the the different inlet dry bulb temperature, inlettemperature, inlet air flow rate prediction, while experiments were carried out underthe same conditions, and the experimentally measured values with the predictedvalues were compared to analyze the performance of the pad material.The same time, we defined a coefficient of performance as a pad performance,the overall performance of the reactive pad cooling capacity and resistance loss ratio.Firstly, the calculation model for the structure of the pad has been optimized, i.e., inthe same conditions, the same type of pad thickness of corrugation angle and thecorrugation height of the pad first calculation the model predictive outlet air dry bulbtemperature, to give the corresponding consolidated performance coefficient,whichever is maximum. The accuracy of the measurement results of comparativeexperiments to verify the results of the optimization, the optimal structure for the finalpacking corrugation height of7mm, corrugated angle of60°, i.e.7060padFor type7060pad, calculation model for further use of its operating conditions areoptimized, results show that within constraints biggest running conditions for comprehensive performance coefficient, inlet air dry bulb temperature of37℃, wetbulb temperature22℃, air flow rate is1ms, water flow is0.09kgs.