Understanding the effect of the condensation temperature on solar-driven reverse distillation for enhanced water production
Understanding the effect of the condensation temperature on solar-driven reverse distillation for enhanced water production
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DOI：
10.1016/j.enconman.2023.118024
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发表时间：
2024-02
影响因子：
10.4
通讯作者：
Ziye Zhu;Hongfei Zheng;Zuyi Liu;Jianyin Xiong;Qiang Chen;Hui Kong
中科院分区：
文献类型：
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作者：
Ziye Zhu;Hongfei Zheng;Zuyi Liu;Jianyin Xiong;Qiang Chen;Hui Kong
由太阳能驱动的反蒸馏将传统太阳能蒸馏中集成在一起的光入射和蒸发-冷凝区域合并，从而提供用于增强蒸汽冷凝的材料和结构的多样化选择。然而，在探索冷凝温度如何影响太阳能-水的能量转换效率在反蒸馏过程中，可能会因此限制进一步的理解和应用在水的生产过程中的详细的实验和讨论。一个普遍的印象是，低温有利于蒸汽冷凝和性能改善，但事实可能并非如此。在这项研究中，从实验和理论探索的一个有趣的结论是，反蒸馏装置的效率是先增加，然后减少与冷凝温度，指示一个最佳的冷凝温度，以获得最佳的产水性能。在一个太阳光照的室内实验中，自然空气冷却的反蒸馏装置显示出1.04 kg·m−2·h− 1的蒸馏物产量和68.8%的太阳能-水能量转换效率，分别比水流增强冷却和绝热抑制冷却的装置高9.4%和6.3%。在室外实验中，使用自然空气冷却的效率分别比增强和抑制冷却措施提高4.9%和7.1%。从传热传质的角度进一步解释了这一结论，为高效反精馏系统的设计提供了有意义的指导。在今后的制水生产中，应根据装置结构和实际工况慎重考虑冷却措施，以达到更好的性能。
Reverse distillation driven by solar energy decouples light-incoming and evaporation–condensation regions that are integrated together in conventional solar distillation, thereby providing diverse choices in materials and structures for enhancing vapor condensation. However, detailed experiments and discussion are scarce in exploring how condensation temperature influences the solar-to-water energy conversion efficiency in the reverse-distillation process and may thus constrict the further understanding and application in water production processes. A common impression is that a low temperature is good for vapor condensation and performance improvement but that may not be the case. An interesting conclusion from both experimental and theoretical exploration in this research is that the efficiency of the reverse-distillation device first increases and then decreases with the condensation temperature, indicating an optimal condensation temperature for obtaining the best water production performance. In indoor experiments with one-sun illumination, the reverse-distillation device with natural air cooling shows a distillate yield of 1.04 kg⋅m−2⋅h−1and a solar-to-water energy conversion efficiency of 68.8 %, which is 9.4 % and 6.3 % more than that of a device with enhanced cooling by water flow and inhibited cooling by thermal insulation, respectively. In the outdoor experiments, the increase in efficiency using natural air cooling is 4.9 % and 7.1 % compared with the enhanced and inhibited cooling measures, respectively. The conclusion is further explained from the perspective of heat-and-mass transfer, which may provide meaningful guidance for designing a high-efficiency reverse-distillation system. In future water production, cooling measures should be cautiously considered according to the device structure and the actual working conditions to achieve better performance.