A concentrating photovoltaic-membrane seawater distillation integrated system is proposed in the paper, which can be used for electricity and fresh water production in island regions. The working principle and structural design of the system are introduced. Optical simulations are performed to study illumination uniformity and light reception on the solar cells. The results illustrate that within the tilt incident angle of 15°, the maximum variance of local concentration ratio is less than 0.8. The whole-day outdoor experiments are carried out. The results show that under the condition of solar irradiance of 800 W/m2 in summer and autumn, the hourly freshwater yield can reach 375.8 g/m2 with water yield efficiency of 33.1%, the hourly average output power can be 61.7 W/m2 with electricity efficiency of 8.0%. Under the weather conditions in winter, the electrical performance of the system does not change obviously. Although the freshwater yield is lower, the water yield efficiency can still reach more than 26 %.
Key words
solar energy /
seawater desalination /
membranes distillation /
compound distillation system /
compound parabolic concentrator
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