Simulation Research Of Internally Cooled Dehumidifier In Solution Dehumidification System

In many environments,air humidity not only affects the quality of the product,but also causes incalculable damage to our property.At present,the solution dehumidification that is new dehumidification method used in the air-conditioning application.The solution dehumidification system can make full use of industrial waste heat and solar energy,so it can save energy very well.The solution dehumidification method not only saves energy,but also improves the air quality due to the sterilization effect of the solution to air.For the study of solution dehumidifiers,the heat and mass transfer processes between the dehumidification solution and air are mostly performed by most scholars in an adiabatic environment,but the temperature of the solution can increase in the adiabatic environment,affecting the dehumidification efficiency of the solution dehumidifier.Based on this,the main subject of this research is the internally cooled dehumidifier in the solution dehumidification system.This article mainly carries out the following research work.First,the solution,air,and cooling water are important three elements in the solution dehumidification system,and the heat and mass transfer process is happened between the three elements.So a mathematical model of the dehumidification is established according to the characteristics of the internally cooled dehumidifier.Besides,assumed conditions and boundary conditions of mathematical model are proposed,and the grid independence of the mathematical model is discussed.Then the model is tested and verified by the experimental data.It shows that the simulated results are in good agreement with the experimental results,which indicates that the established model has higher reliability,providing a reliable tool for the subsequent simulation of the internally cooled solution dehumidifier.Second,the effects of solution temperature,solution concentration,solution flow rate,air flow rate,the moisture content of air,air temperature and cooling water temperature are simulated based on the established mathematical model on the heat and mass transfer process of the internally cooled solution dehumidifier.The results show that low temperature of dehumidification solution,high concentration of dehumidification solution,the high moisture content of air,small air flow rate,low temperature of cooling water can improve the performance of the dehumidifier.The solution concentration can not be too large,otherwise it can cause the solution to crystallize.Increasing the flow rate of the solution does not greatly improve the performance of the internally cooled solution dehumidifier.In addition,air temperature has little effect on the performance of the internally cooled dehumidifier.In the future reform of the dehumidifier,the bottom of the dehumidifier is a weak area,and the temperature in the bottom area should be reduced.Finally,the dehumidification efficiency is selected as a criterion for evaluating the performance of the internally cooled solution dehumidifier,and and the running rules of the internally cooled dehumidifier used in typical cities in different climate regions are compared.The results show that when the internally cooled solution dehumidifier is used in Harbin and Kunming,the concentration of the dehumidification solution must be relatively high and the temperature should be as low as possible,even when the solution concentration is higher,the dehumidification efficiency of the internally cooled solution dehumidifier in Harbin and Kunming can catch up with the dehumidification efficiency in Guangzhou.When the internally cooled solution dehumidifier is applied in Harbin,it is not suitable to improve the dehumidification efficiency by increasing the flow rate of the solution,but when applied in Kunming and Guangzhou,the flow rate of the solution can be appropriately increased.When the dehumidifier is operated at a small air flow rate,the dehumidification efficiency is higher and the application range is wider.In order to improve the performance of the internally cooled solution dehumidifier,the dehumidifier must have a relatively high size and the lower cooling water temperature.