Experimental Verification On Cooling Performance Of Direct Evaporative Cooler With Coil Tube

Evaporative cooling technology,which has long since begun to create a more comfortable living environment for humans,is a technique for cooling the dry bulb to cool.In recent years,the application of evaporative cooling technology at home and abroad have very extensive,various individual or combination of direct evaporative cooling air conditioning in our country has a large number of production,and direct evaporative cooling air conditioning to our country about the application of low energy refrigeration technology and promotion has played a very big effect.However,direct evaporative cooling air conditioning temperature drop is limited,thus the indirect evaporative cooling air conditioning technology,indirect evaporative cooling is will be of direct evaporative cooling air or water used for air cooling is processed,the process is through the direct contact heat exchanger.Indirect evaporative cooling air handling process compared with the direct evaporative cooling is more a wet cooling process,so you can get more low temperature air supply,but indirect evaporative cooling air conditioning technology prone to blockage,rust,increased maintenance costs.So this topic with a coil is put forward the direct evaporative cooler is a new kind of cooler,in front of the direct evaporative cooler add buy a fin plate section,it is the direct evaporative cooling water circulation in the fin plate tube to the cooled air precooling,precooling air again after a direct evaporative cooling can be cooled to a lower temperature.Through theoretical analysis and experimental study,this paper studies the influence of the inlet air head wind speed and coil flow ratio of the direct evaporative cooler of the coil pipe on the cooling performance of the pipe.The experimental result shows,when inlet air head on wind speed 2.5 m/s,coil tube flow rate 40%,air outlet dry bulb temperature is the lowest,reduced from 38 ? to 22.4 ?,the temperature is 15.6 ?,the cooling efficiency as high as 104%.When considering the power loss with the increase of the air on wind speed was positively proportional to the growth of the experimental results,this article with coil epsilon resistance coefficient to describe the proposed economic performance of the direct evaporative cooler,ultimately determine the most energy-efficient economy and high operating mode of air cooling effect on the wind speed 1.0 m/s,coil tube flow rate 40%,the cooling efficiency of 98.7%.In the study of cooling performance of the direct evaporative cooler of the coil pipe,the ratio of air head wind speed and coil flow rate was changed respectively.Found that:(1)under the different air head on wind speed,the cooling performance parameters change with the change of the coil pipe flow of show the same rule,and in the coil pipe flow 40% maximum cooling efficiency and minimum resistance coefficient;(2)and under the different coil pipe flow of the belt of direct evaporative cooler coil head on wind speed changes with the air cooling performance parameters,the change rule of different when air head on wind speed 2.5 m/s,the tape coil direct evaporative cooler cooling efficiency of the biggest;When the wind speed of the air is 1.0 m/s,the resistance coefficient of the direct evaporative cooler of the coil is the least of the economic performance.Therefore,in general,the cooling performance of the coolers has an important impact on the cooling performance of the cooling device of the direct evaporative cooler.