A concentrated multi effects solar still with rising film was proposed to desalinate on the sea. The desalination device comprises a parabolic concentrator and a plurality of vertically arranged evaporation-condensation units. A hydrophilic wick is selected as the evaporator, and seawater forms a rising liquid film under the action of capillary suction, which effectively reduces the heating loss. The internal heat and mass transfer process was analyzed through the theoretical model. The effects of different operating parameters on the temperature, water yield and specific energy consumption of the unit were studied experimentally. The indoor steady-state research results show that when the solar irradiance is 900 W/m2, the internal temperature difference of the distiller is 56.9 ℃, and the water yield can reach 2.64 kg/ (m2·h). Under the outdoor average irradiance of 603.7 W/m2, the daily water yield of the unit is 5.3 kg/ (m2·d) and the daily average specific energy consumption is 1591.6 kJ/kg.
Key words
solar energy /
light concentration /
desalination /
distillation /
heat and mass transfer
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