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本文研究了一种基于菲涅耳透镜聚光和多级回热的加湿除湿太阳能海水淡化系统.建造一个小型的太阳能海水淡化装置,并利用一种自设计的圆弧形菲涅尔透镜为该系统聚光直接加热.介绍了四级淡化系统的结构原理,装置通过三级等温加热的方式为系统供能.文中依据系统各部分能量的关系,建立对应的数学关系.室外实验测得,装置的最大产水量为1.5 kg/h,系统的性能系数为0.73.“,”A heat recovery with tandem desalination system with Fresnel concentrator based on humidification and dehumidification (HDH) process was investigated experimentally in this paper.In order to test these concentrators in the brackish water desalination field,we have designed and built in our laboratory a small solar desalination unit equipped with a curved Fresnel lens concentrator.The sketch and principle of a four-stage multi-effect solar HDH desalination process are given out.The system obtains fresh water by three-stage isothermal heating mode.A mathematical model based on the energy balances in each unit of the system is developed which is used to optimize the test.The maximum yield of the unit can reach 1.5 kg/h,the gained output ratio (GOR) of the system can reach about 0.73.