Experimental Study And Simulation On Performance Of Solar Liquid Desiccant Regenerator

With the continuous development of the society, the energy problem is getting moreand more attention, and the energy waste caused by the traditional air conditioning systemneeds to be resolved urgently.In the traditional air conditioning system, the supercoolingmethod is adopted to remove the excess moisture of the air, which temperature will bereduced to very low. We must reheat the air to the comfortable temperature before passinginto the interior, which virtually increases the energy consumption.Liquid desiccant airconditioning system is a kind of air conditioning system which can utilize solar energy orother low grade energy to regenerate desiccant solution, the air will be treated by thedifference between the water vapor partial pressure of salt solution and the partial pressureof water vapor in the air. At the same time, salt solution can kill most of the bacteria in theair, playing the role of purifying air.Liquid desiccant air conditioning system not onlysolves the problem of energy waste caused by traditional air conditioning system, but alsocan play the role of purifying the indoor environment, so it is important for research anddevelopment of the liquid desiccant air conditioning system.Combining with the engineering example, the characteristics of heat and massexchange of liquid desiccant regeneration process were studied experimentally. Underdifferent solution inlet parameters,the measuring point temperature distribution of thecenter position of the different section inside the regenerator are obtained. The influence ofdifferent air and solution inlet parameters on the solution outlet concentration are obtained,and the influence of regenerator with or without filler on heat and mass exchange ofregenerator are also obtained. The results will provided the basis for the design of solarliquid desiccant system in the regenerator.Under the experimental conditions, the optimaladjustment of the regenerator solution regeneration is obtained, which provides the basisfor the design of solar liquid desiccant system in the regenerator.Meanwhile, this paper established the simulation model of the regenerator in a liquid desiccant air conditioning system based on the principle study of solution regeneration inliquid desiccant air conditioning. The heat and mass transfer of the regenerator wassimulated by coupling with continuous phase and a discrete phase.which provide atheoretical basis for characteristics research of heat and mass exchange in the process ofregenerator regeneration and the optimization and reconstruction of regenerator.The outlet concentration of regenerator increased with the increase of the spray flowrate, spray temperature and the supply air temperature of regenerator.Increasing the fillerinside the regenerator can increase the gas-liquid contact area, which can effectivelyenhance the heat and mass transfer between gas and liquid. It is advantageous to thedehumidification process that lower the outlet temperature of the regenerator, and increase35%-65%concentration.It provides a reference value and guiding significance for thedesign of the experiments through simulating the regeneration process of regeneratorsolution which results will compare with the experimental data.