Simulation And Application Research Of Dew Point Evaporative Cooler

Energy shortage is a decisive factor that affects economic development and threatens human survival.All walks of life are contributing to solving energy problems,and the HVAC industry is no exception.Compared with traditional mechanical refrigeration air conditioners,dew point evaporative cooling air conditioners have the advantages of no compressor,high efficiency,energy saving,and economy.They are new developments and new developments of evaporative cooling technology,and they are important research directions in the future air conditioning market.This article mainly uses numerical simulation,theoretical analysis,and measurement research methods to deeply analyze and study the relevant factors affecting the performance of dew point evaporative coolers,explore the influence of each factor,test the actual performance of dew point evaporative coolers,and find problems in the process of use,And propose solutions to provide a reference for similar research and optimization of dew point evaporative cooler performance.The working principle of the countercurrent ripple dew-point evaporative cooler is analyzed in detail,and all aspects involved in the numerical simulation process are introduced,including the process of drawing the physical model;the establishment of the wet and dry channels and the water film mathematical equations;The division of the grid includes the type of grid,the number and quality of the grid;the setting of boundary conditions,including the boundary conditions of the air in and out of the wet and dry channels and the water film;the models and calculation methods used in Fluent are explained;The quality of the grid was also verified by grid independence;in order to ensure the accuracy of the calculation results,the calculation results were compared with the experimental data with an error within 5%;the temperature distribution clouds in the dry and wet channels were analyzed,and the introduction was also introduced.Evaluation index of cooling performance of dew point evaporative cooler.The factors that affect the performance of the dew point evaporative cooler are divided into three categories: inlet air,circulating water,and channel construction.Using the control variable method,the temperature of the output air of the ripple countercurrent dew point evaporative cooler was analyzed with the changes of the inlet air temperature,flow velocity,relative humidity,working air intake ratio,circulating water temperature,mass flow,channel length and spacing,The cooling capacity,the water outlet temperature of the wet channel,the wet bulb efficiency,and the dew point efficiency change rules,and the cause of the impact is analyzed,and the cooling effect,cooling capacity requirements and cost issues are fully considered.The recommended inlet air flow rate is 2 m/s.Right and left,the working air intake ratio is 0.3,and the circulating water temperature is 20 ℃,which can make the ripplecountercurrent dew point evaporative cooler achieve the best effect.In order to comprehensively analyze the energy utilization and loss nature of the ripple countercurrent dew point evaporative cooler from the aspects of energy quantity and quality,it is very clear to understand the location,size and cause of the energy loss of the cooler during use.Based on the law,a martingale analysis of the cooler was carried out.It mainly introduces the calculation methods of radon analysis,including the selection of environmental state points,thermal energy radon,chemical radon,mechanical radon,and radon efficiency calculation formulas.The conversion relationship between thermal energy,chemical energy,and mechanical energy in the wet and dry channels is also analyzed.At the same time,the influences of radon distribution and radon efficiency in the channel of inlet air temperature,flow velocity,relative humidity,working air intake ratio,circulating water temperature,and mass flow rate change were analyzed,and related reasons were analyzed.This paper introduces the engineering overview of buildings using composite dew-point evaporative cooling air-conditioning units,and explains the working principle and related parameters of the units.It also describes the methods of measuring humidity,air volume,layout of measurement points,and instruments used in the test.The dry environment temperature,relative humidity,the wet bulb efficiency,dew point efficiency,cooling capacity,COP,evaporation capacity,air inlet,and exhaust air of the outdoor environment,air inlet,air outlet,and air outlet during the test time were analyzed The enthalpies of dry air and water vapor at the air outlet and the air outlet were changed and the average value was calculated.At the same time,the problems that affect the performance of the unit during use,including water quality problems,dehumidification problems,and operation mode problems,were found during the test process,and corresponding solutions were proposed.The corrugated countercurrent dew point evaporative cooler is compared with the composite dew point evaporative cooling unit,and the results show that the performance of the corrugated countercurrent dew point evaporative cooler is better.