Experimental Study On The Performance Of Dehumidification By Using The Direct Evaporative Ternary Solution

The temperature and humidity independent control technology has received considerable attention in recent years,because of its high efficiency in dehumidification and energy saving and environmental protection.In the air conditioning process using solution dehumidification technology can achieve in the way of temperature and humidity decoupling control.It can be better combined with the low grade energy utilization technology to improve the energy efficiency and achieve the cascade utilization of energy.In this paper,for the purpose of enhancing the dehumidifying performance in research,a new type of dehumidification system was designed and a direct evaporative ternary dehumidification solution was proposed and studied.The ternary solution consists of lithium chloride,anhydrous ethanol and water.Through the experiment,the experimental data were obtained,and the dehumidification performance of lithium chloride solution and ternary solution were compared and analyzed.This paper mainly carried out the following aspects of the work:(1)Combined with the physical process of solution dehumidification process,the principle of solution dehumidification technology is analyzed in detail,and the parameters of cross flow dehumidifier are analyzed by the mathematical model of heat and mass transfer,which provides optimization indexes for dehumidification system optimization.(2)By comparing various types of dehumidifier and considering each dehumidifier advantage,the author designed a new type of membrane rotary dehumidifier which can greatly improve the utilization rate of desiccant.At the same time,the anhydrous ethanol was added into the traditional lithium chloride solution as the evaporative coolant to control the temperature of the solution,so as to improve the solution dehumidification performance.On the basis of this,the ethanol recovery system and two regeneration devices have been designed which comprises a lithium chloride solution concentration regenerating device and a glycerol concentration regeneration device.The regenerated lithium chloride solution and the recovered ethanol are mixed in a concentrated solution tank and delivered to the dehumidifier.The glycerol solution after the concentration recovery is passed into an ethanol recovery device,thus achieving a complete solution of the dehumidification process.At the same time,the measurement system was built on the framework of the dehumidification system,which ensured the accuracy and accuracy of the measurement,and provided the data support for the analysis of the experimental results.(3)The experimental study on the dissolution properties of the new ternary dehumidification solution was carried out,and the optimum mixing ratio range of ethanol was obtained,to ensure the concentration of lithium chloride dehumidification effect of the conditions,the proportion of anhydrous ethanol should be controlled within the range of 5% to 30%,which provided the technical data foundation for the experimental study on the dehumidification performance.(4)The desiccant performance of the separate lithium chloride solution and the dehumidification performance of the direct evaporative ternary dehumidification solution were studied and analyzed by the two comparative experiments.Under the different experimental factors,the effects of different influencing factors and dehumidification performance trends were studied.The experimental results show that under the condition of different influencing factors,the efficiency of the new ternary dehumidification solution is increased by 56%~112%,and the dehumidification efficiency is greatly increased,the increase in the range of 0.04 ~ 0.06g/s.