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Performance study of a passive vertical multiple-effect diffusion solar still directly heated by parabolic concentrator
Renewable Energy ( IF 8.7 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.renene.2021.09.074
Lu Wang 1 , Xinglong Ma 1 , Yunsheng Zhao 1 , Rihui Jin 1 , Hongfei Zheng 1
Affiliation  

This paper presents a passive vertical multiple-effect diffusion (VMED) solar still integrated with a parabolic concentrator, which utilizes concentrated sunlight to directly produce freshwater. The VMED solar still comprised a vertical solar absorber and several partitions arranged parallel and attached with hydrophilic wicks. The high temperature gradient produced by the parabolic concentrator in the still can effectively improve the water productivity. The structure of the parabolic concentrator was designed, and its optical simulation was performed. The energy balance equation was established to analyze the heat- and mass-transfer process. To evaluate the productivity and efficiency of the still, a small prototype was fabricated and tested under different conditions. Indoor steady-state experiment results showed that using a parabolic concentrator could improve the six-effect VMED still efficiency by 60% and increase the temperature gradient in the still to 56.9 °C. With increased irradiance from 500 W/m2 to 900 W/m2, the freshwater yield of the six-effect still improved from 1.27 kg/m2/h to 2.64 kg/m2/h, and the corresponding gain-output ratio increased from 1.72 to 2.31. Outdoor-experiment results showed that the obtained daily yield was 5.3 kg/m2/day at an average solar radiation of 603.7 W/m2. Performance and economic analyses indicate that the designed VMED still was suitable for application in remote offshore areas.



中文翻译:

抛物面聚光器直接加热的被动式垂直多效扩散太阳能蒸馏器的性能研究

本文介绍了一种与抛物面聚光器集成的被动垂直多效扩散 (VMED) 太阳能蒸馏器,该聚光器利用聚集的阳光直接生产淡水。VMED 太阳能蒸馏器包括一个垂直的太阳能吸收器和几个平行排列并附有亲水灯芯的隔板。釜内抛物线浓缩器产生的高温梯度可有效提高产水率。设计了抛物面聚光器的结构,并对其进行了光学仿真。建立能量平衡方程来分析传热传质过程。为了评估蒸馏器的生产率和效率,制造了一个小型原型并在不同条件下进行了测试。室内稳态实验结果表明,使用抛物线聚光器可以将六效 VMED 蒸馏器效率提高 60%,并将蒸馏器中的温度梯度增加到 56.9 °C。辐照度从 500 W/m 增加2~900 W/m 2,六效淡水产量仍由1.27 kg/m 2 /h提高到2.64 kg/m 2 /h,相应增产比从1.72提高到2.31。室外试验结果表明,在平均太阳辐射量为 603.7 W/m 2 时,获得的日产量为 5.3 kg/m 2 /天。性能和经济分析表明,设计的 VMED 仍然适用于偏远的近海地区。

更新日期:2021-11-01
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