Study On Solar Humidification Dehumidification Desalination System With Composite Parabolic Concentrator

Freshwater resources are the necessary conditions for sustainable development of human beings.saline desalination is an important method for freshwater production.In this paper,a solar humidification and dehumidification desalination system,which uses CPC collector to gather light and heat and realizes the heat exchanger on the internal conducting energy heat exchange are studied,This system effectively solves the energy loss of external heat exchange.Made the following research work:1.A solar humidification and dehumidification desalination system was built.The working medium was heated by a compound parabolium concentrator(CPC),and the heat exchange was carried out through the heat exchanger with the humidification box.The system is mainly composed of compound parabolic concentrator,humidification box,dehumidification box,heat exchanger and so on.2.The heat collecting process and energy loss of the compound paraboloid concentrator were analyzed,and the temperature changes of the heat conduction oil inlet and outlet under different CPC groups(1 group,2 group and 3 group)were studied.3.Theoretical analysis of the heat transfer model of the system,water production performance,system performance coefficient,energy loss and performance of some devices in the desalination process of the solar humidification and dehumidification system were carried out..4.Under different CPC groups(1 group,2 group,3 group)and installation Angle(15°,30°,35°,45°),the energy obtained by the system,the temperature of part of the device,the system performance and the change of system water production performance coefficient in the experiment were explored..5.The experiment shows that when the CPC is in group 1,group 2 and group 3,and the inclination Angle is 15°,30°,35° and 45°,the system water production is the best matching parameter when the two groups of CPC collectors and the installation inclination Angle is 15°.That maximum daily water production can reach 9.98 kg,the instantaneous maximum GOR can reach 1.49,and the instantaneous maximum water production every half an hour can reach 998 g.The instantaneous maximum temperature of the heat conducting oil is 103.9 ?,the instantaneous maximum temperature of the humidifying box is 41 ?,the instantaneous maximum temperature of the dehumidifying box is 37.4 ?,and the instantaneous maximum useful energy ratio is 0.48.6.Compared with other solar salting-water desalination methods,the compound parabolic concentrator in this paper can obtain a medium temperature working medium of about 150? without tracking the solar energy,which can greatly improve GOR,daily water output,temperature of heat conducting oil,temperature of humidifying box and dehumidifying box.Through the heat exchanger placed in the humidification box for heat exchange to reduce the energy loss,has the advantages of convenient cleaning,simple operation and so on..