Experimental Study Of Heat Transfer Characteristics Of Tubular Indirect Evaporative Cooler

In recent years, with the advance of China’s "Twelfth Five-Year Plan", energyconservation is increasingly becoming key work. in the process of China’s economicdevelopment. In the building sector, the energy consumption of air conditioning is a majorpart of building energy consumption, therefore energy-saving in the field of air-conditioningis very important.The mode of evaporative cooling which achieve cooling by the power of dry air reflectsthe requirements of social development who require to save energy, protect the environmentand reduce energy consumption to make the environment protected well. And with theimprovements of technology continuously, evaporative cooling air-conditioning has beensuccessfully applied in the dry climate of Northwest China. Lanzhou in inland areas where isa temperate continental climate is conducive to the application of evaporative cooling airconditioning that has less precipitation,big temperature difference and dry air conducively tothe application of evaporative cooling air conditioning.This paper introduces the domestic and foreign case study in tubular indirect evaporativecooler and proposed experimental purposes, meaning, method, and problems that are still inthis area in the research of tubular heat transfer performance of indirect evaporative coolerAnd this paper analyzes the exchanger principle of tubular indirect evaporative coolerheat.And it points out that the heat and mass exchange mechanism of water and air in directcontact followed by evaporative cooling is the theoretical basis and the enthalpy differencewill be the driving force pushing the total heat exchange.when water and air heat exchangeand mass transfer. And heat and mass transfer processes of tubular indirect evaporative coolerwere analyzed and calculated through access to relevant information and documents.And thepaper select the relationship between heat and mass transfer which has a smaller tmargin oferror to calculate effective technical parameters of primary air, two secondary air and spraywater in heat transfer process,which provide a theoretical basis for the better application anddevelopment for tubular indirect evaporative cooler in the climatic condition of Lanzhou.Thereafter, the paper focuses on the tubular indirect evaporative cooler heat transfercharacteristics of experimental tests and research,by setting initial stateparameter ofexperimental device reasonably and by controlling system installed in the test to control theexperimental variables of evaporative cooler, such as primary air when dry bulb temperature,secondary air wet bulb temperature,, secondary/primary air ratio, etc. The conclusion arechanges of the experimental parameters and effects to the efficiency of the tubular indirectevaporative cooler when the parameters change. It provides reference for tubular indirectevaporative cooler in the practical application of Lanzhou region. In addition,the paper reasons and verificates a engineering practice indirect evaporativecooler thermal model which is JLPeterson created. After a theoretical analysis of this model,and then use the experimental method to validate the applicability of this model to prove thepracticality of this model works, drawn one for engineering practice indirect evaporativecooler heat exchanger model.At last the paper introduce the process of establishing numerical model of indirectevaporative cooling tube which there are spiral inserted. It results overall temperaturevariation curve, temperature variation curve of primary air central path route and helicalinterpolation and the non-spiral tubes each position were analyzed temperature contours. Andthe results show that the interpolation helix spiral tubes within tubes primary air temperaturedecreases are significantly better than tubes without spiral.