Experimental Study on a Closed Circulation Solar Desalination Unit
with Horizontal Tube Falling Film Evaporation
Zhang Xiaoyan,Zheng Hongfei,Wang Qiang,Zhang Lianying,Tian Huaizhang
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

Abstract: Based on the analysis of characteristic of the basin type and vertical falling film solar desalination units and the theory of horizontal tube falling film evaporation, aiming at the shortcomings of previous units, a closed circulation solar desalination unit with horizontal tube falling film evaporation was designed and experimented under the conditions
of different operating parameter, and the influence factors on performance of unit were also analyzed. Experimental results indicate that the freshwater yield is about 2～2.5 times higher than the singlestage basin solar distiller when the supplied energy is the same. It's favorite to increase operating temperature for improving freshwater yield and freshwater yield per unit energy consumption. The flow rate of hot water of 300～600 kg／h and the feedstock of 8～15 kg／h can increase the freshwater yield and improve the performance of unit.
Keywords: solar energy;desalination; horizontal tube falling film evaporation; closed circulation