Performance Analysis And Experimental Study For A Liquid Desiccant Air Conditioning System Using Solar Energy

With the increasing energy shortage and environmental awareness,people are more concerning the issues which causes by the traditional condensation dehumidification air-conditioning system,such as high energy consumption,low air quality,serious environmental pollution and other drawbacks.Therefore,the research and application of new energy-saving and environmentally friendly dehumidification air-conditioning system is becoming more and more critical.The solar regeneration solution dehumidification air conditioning(SRSDAC)has the advantages of energy saving and high indoor air quality,which has aroused wide interest in industry and academia.Based on TRNSYS simulation platform,this dissertation studies the performance and applicability of the SRSDAC system in four typical cities,i.e.Jinan,Yantai,Chongqing and Guangzhou.The main work of this dissertation is concluded as follows:In order to provide a theoretical basis for the later experimental study,firstly,the mathematical models of cross-flow dehumidifier and counter-flow regenerator are established according to the laws of energy and mass conservation;at the same time,the characteristics of commonly used liquid desiccants are analyzed and compared,and finally LiCl liquid is selected as the experimental dehumidification solution.Secondly,the design and construction process of SRSDAC system is introduced in detail based on the actual case of a university office building in Jinan.The design and calculation process of the dehumidification module,regeneration module and plate heat exchangers are describes,and the design parameters of the system are studied and analyzed in detail.According to the design results,the SRSDAC system was established which can not only remove the moisture load from the buildings,but also provide a test rig to analyze the heat and mass transfer performance of theSRSDAC system.Through the analysis and processing of the experimental data,the dehumidification efficiency of the SRSDAC system varies from 28.81% to 51.67%under the experimental conditions,and the regeneration efficiency of the regenerator varies from 53.31% to 67.47%.Finally,the simulation model of the SRSDAC system is developed based on TRNSYS dynamic simulation platform.The simulation model was validated by the experimental data obtained on September 22,2018.The results show that the relative error between the experimental data and the simulation data is less than 15%,which indicates that the accuracy of the simulation model is acceptable.At the same time,four typical cities with different solar radiation intensity and outdoor air moisture content,Jinan,Yantai,Chongqing and Guangzhou,are selected to compare the regeneration performance and energy consumption in cooing season.The results show that the solar energy guarantee rate of Jinan is the highest(65.4%).Under the same dehumidification design load,the total energy consumption of Jinan is the lowest(46354 kWh),followed by Yantai with 48376 kWh and Guangzhou.The system in Chongqing has the highest energy consumption,52108 kWh.The research shows that this design system is more suitable for wet zone ? and solar resource distribution zone ?.