Study On The Regeneration Mechanism Of Liquid Under Vacuum Condition

In China, due to building energy consumption being about1/3of total socialconsumption and showing an upward trend, air conditioning energy technology researchwhich accounts for50%~70%to the building energy consumption has become the hotcurrent topic. Traditional air conditioning depends heavily on high-grade energy as thedriving force, such as electricity or burning. At the same time, with the lower COP, hot andcold offset phenomenon is more serious, the sharp contradiction between air conditioningenergy consumption and the improvement of living standards appears. Considering the useof renewable energy, low-grade energy, air quality, and other factors, liquid desiccant airconditioning will be more and more widely used. The project for the study of new liquiddesiccant air conditioning system and its regeneration will lay a theoretical foundation andtechnical support for the application. It’s important for saving energy, ensuring the air qualityand promoting the development of power engineering and engineering thermal physics.In this paper, combination of vacuum cooling technology and liquid regenerationtechnology, based on the principle of vacuum evaporation temperature decreased，the lowtemperature heat source was used to make the liquid regenerate under vacuum condition, soas to reduce the heat source temperature and save energy. The process of heat and masstransfer in the regenerator were analyzed thermodynamic. The experimental test facility ofregeneration system experiment platform under vacuum condition was set up aftercalculating the load of the cold water and hot water system, selecting the design of mainequipment of water chiller, vacuum cooling tank and vacuum pump.The liquid regeneration system under vacuum condition was taken orthogonalexperiment design. The experimental program was determined to the principles oforthogonal experiment. The experimental factors included the initial concentration, hot watertemperature, flow, cold water temperature and flow. Experimental results showed that, theexternal heat temperature and the initial concentration affected significantly on liquidregeneration rate. Hot water flow, cold water temperature and flow had little effects on theevaporation.RCOP was introduced to evaluate the solution regeneration efficiency energyconsumption under vacuum condition; Optimum operation was got from the experimentalresults; Experimental results were compared with the numerical simulation results and theerrors were analyzed. Finally, according to the experimental results and the equipmentoperating conditions of the experimental process, some reasonable proposals on the researchdirections were put forward.