Design And Application Of Plate-tube Indirect Evaporative Cooler

Evaporative cooling has been recognized in the air-conditioning industry by using renewable "dry-air energy".Among them,indirect evaporative cooling is used by more and more industries for its characteristics of reducing temperature without humidifying and increasing the duration of natural cooling;The types of indirect evaporative cooling heat exchangers are mainly plate-fin type and round tube type,but they are prone to blockages and uneven water distribution when used in northwest China or areas with a lot of wind and sand,which affect the performance of the use of heat exchangers.Advantages and disadvantages of evaporative cooling heat exchangers,this paper proposes a plate-tube indirect evaporative cooler,which can make the heat exchanger more uniformly distributed water,compact structure,and easier to clean.Provide new indirect evaporative cooler options for high sensible heat fields such as data centers and textile mills.First of all,by summarizing the existing forms,about advantages and disadvantages of indirect evaporative coolers by reading the literature,to understand the current status of research and application of the latest indirect evaporative technologies at home and abroad,and to design and manufacture and test the heat exchanger for later stages Lessons Learned.According to the outdoor design parameters of the air-conditioning summer in a certain area of Shandong,the theoretical design and calculation of the structural size of the indirect evaporative cooler,including the equipment selection during the experiment of the heat exchanger in the later stage,and finally the field experimental testing and analysis institute in the enthalpy difference laboratory Design the optimal operating conditions of the heat exchanger.Experimental conditions: Air-conditioning summer outdoor design parameters of representative cities in dry,medium-humid and high-humid regions were selected as experimental conditions,and experimental data such as temperature and humidity self-recorder,anemometer,infrared thermal imager were used to collect experimental data.And record.（1）When the inlet conditions are: dry bulb temperature of 34.4±1℃ and wet bulb temperature of 27.9±1℃,the optimal water volume of the plate and tube indirect evaporative cooler is 4.5m~3/h;the inlet conditions are: dry With a bulb temperature of35±1℃ and a wet bulb temperature of 25.8±1℃,the optimal amount of water for the plate and tube indirect evaporative cooler is 4m~3/h;the inlet conditions are: dry bulb temperature31±1℃,wet bulb temperature In the case of 18.2±1℃,the optimal water spraying capacity of the plate and tube indirect evaporative cooler is 3.4m~3/h;the test results show that although the water spraying volume is related to the outdoor air environment parameters,the optimal water vapor on the secondary air side The ratio is between 0.55 and 0.85,so it can be concluded that the water-air ratio of the plate and tube indirect evaporative cooler and the heat exchanger structure are in a fixed relationship.（2）The test results of the heat exchange core from dry to high-humidity area show that as the outdoor air environment becomes more dry,the secondary/primary air volume ratio of the indirect evaporative cooler becomes smaller.Indirect evaporative cooling is generally combined with filler,mechanical refrigeration and other structures into an air-conditioning unit.According to actual engineering,after analyzing the use of plate and tube indirect evaporative coolers in dry areas,the evaporative cooling technology combines mechanical cooling operation modes and various modes.For the duration of use,only 215 hours during the refrigeration season in a certain region of Xinjiang need to turn on mechanical refrigeration to meet the demand for refrigeration,and explain the control mode method ideas and energy saving analysis in theoretical applications.Figure 61,table 11,54 references.