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Experimental study on three-effect tubular solar still under vacuum and immersion cooling
Desalination ( IF 9.9 ) Pub Date : 2021-06-28 , DOI: 10.1016/j.desal.2021.115211
Tiantong Yan , Guo Xie , Wenlong Chen , Zhanglin Wu , Jialing Xu , Yingzhang Liu

Solar still is widely used for supplying fresh water to small communities in remote areas. One drawback of this technique lies in the low freshwater yield. Recent studies on stills of multi-effect and vacuum design proved their potential for high yield. However, such systems suffer from high electricity consumption and insufficient cooling. In this study, a novel system with a periodic pressure control scheme and water immersion cooling has been proposed to mitigate these defects. A prototype was constructed and associated with a 0.19-m2 solar panel. A 5-day outdoor experiment was conducted to evaluate the overall performance. Results indicated that the highest yield during the test was 9.8 kg/m2 at operating pressure of 40 kPa. A significant performance ratio of 1.87 was achieved with immersion cooling, i.e., 0.42 higher than that with air cooling. Thermal analysis showed that the heat transfer coefficient of water immersion cooling was 15–50 times higher than that of air cooling. Compared with previous vacuum-operated systems, the specific electricity consumption of maintaining vacuum was greatly reduced, i.e., from 21.6 kJ/kg to 1.7 kJ/kg for the case at 60 kPa. The forecast cost of the distilled water is $0.012/kg, representing an affordable desalination technique for off-grid communities.



中文翻译:

真空浸没冷却三效管式太阳能蒸馏器的实验研究

太阳能蒸馏器广泛用于向偏远地区的小社区供应淡水。这种技术的一个缺点在于淡水产量低。最近对多效和真空设计蒸馏器的研究证明了它们具有高产量的潜力。然而,此类系统的耗电量高且冷却不足。在这项研究中,提出了一种具有周期性压力控制方案和水浸冷却的新型系统来减轻这些缺陷。构建了一个原型并与一个 0.19 米2 的太阳能电池板相关联。进行了为期 5 天的户外实验以评估整体性能。结果表明,试验期间的最高产量为 9.8 kg/m 2工作压力为 40 kPa。浸入式冷却实现了 1.87 的显着性能比,即比空气冷却高 0.42。热分析表明,水浸冷却的传热系数比空冷高15-50倍。与以前的真空操作系统相比,保持真空的比电耗大大降低,即在60 kPa的情况下,从21.6 kJ/kg降至1.7 kJ/kg。蒸馏水的预测成本为 0.012 美元/公斤,对于离网社区来说是一种负担得起的海水淡化技术。

更新日期:2021-06-29
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