Solar still is a promising device used worldwide for water distillation due to its simple design, easy construction and low cost. However, the freshwater output from a solar still is moderate. Several active techniques have been emerged over the years to solve this problem. In this paper, an experimental study is carried out on a single-slope solar still augmented with an evacuated tube collector (ETC) and a heat exchanger working on thermosyphon. The effects of shading and evaporative cooling of glass cover on the active solar still performance were explored and analyzed on separate days under the meteorological conditions of Kurukshetra, India. The experiments were conducted at a constant water depth of 4 cm. The main aim of this study is to enhance the productivity and efficiency of ETC-coupled solar still by increasing the condensation rate. The experimental results showed remarkable increment in freshwater productivity of the still with a maximum of 2114 ml/day achieved for the case of ½ shading and cooling of glass cover. An increase of 16.4% and 3.8% in freshwater productivity and overall efficiency was achieved with ½ shading and cooling of glass cover in comparison with solar still without glass cover shading and cooling. The solar still performance was decreased when the shading and cooling are done on more than half the area of glass cover.

中文翻译：

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玻璃罩遮光和蒸发冷却对真空管式太阳能蒸馏器性能的影响

太阳能蒸馏器由于其设计简单、施工方便且成本低，是世界范围内用于蒸馏水的有前途的装置。然而，太阳能蒸馏器的淡水输出量适中。多年来已经出现了几种有效的技术来解决这个问题。在本文中，对配备真空管集热器 (ETC) 和热虹吸换热器的单斜太阳能蒸馏器进行了实验研究。在印度 Kurukshetra 的气象条件下，在不同的日子里探索和分析了玻璃罩的遮阳和蒸发冷却对活性太阳能蒸馏器性能的影响。实验是在 4 厘米的恒定水深下进行的。本研究的主要目的是通过提高冷凝率来提高 ETC 耦合太阳能蒸馏器的生产率和效率。实验结果表明，在玻璃盖的 ½ 遮光和冷却的情况下，蒸馏器的淡水生产率显着增加，最高可达 2114 毫升/天。与没有玻璃罩遮阳和冷却的太阳能蒸馏器相比，使用 ½ 遮阳和冷却玻璃罩实现了淡水生产力和整体效率的增加 16.4% 和 3.8%。当遮阳和冷却超过一半的玻璃盖面积时，太阳能蒸馏器的性能会下降。与没有玻璃罩遮蔽和冷却的太阳能蒸馏器相比，玻璃罩的 ½ 遮蔽和冷却实现了 8% 的淡水生产力和整体效率。当遮阳和冷却超过一半的玻璃盖面积时，太阳能蒸馏器的性能会下降。与没有玻璃罩遮蔽和冷却的太阳能蒸馏器相比，玻璃罩的 ½ 遮蔽和冷却实现了 8% 的淡水生产力和整体效率。当遮阳和冷却超过一半的玻璃盖面积时，太阳能蒸馏器的性能会下降。