Pure and fresh water is being scarce day by day. Although Bangladesh is a riverine country, pure drinking potable water is not a cheap commodity. Most of the people in the cities boil water to drink, and people of the villages take tube-well’s water directly, which might have high amount of heavy metal like arsenic. Solar still is a cheap and very useful renewable technology, which can be used in Bangladesh extensively everywhere at the rooftop as a pure water source. Objective of this paper was to find a low cost portable and easily maintainable passive solar still for southern part of Bangladesh. All the parameters of passive solar still are studied, and it is found that an inclined stepped solar still with passive condenser, internal and external reflectors, black cotton wick, and with optimum design values can be the desired still, which would give maximum yield. Finally, the optimum values of the parameters are used to propose a cheap design.

中文翻译：

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孟加拉国南部无源太阳能蒸馏器的最佳参数值及其设计综述

每天都在缺乏纯净和淡水。尽管孟加拉国是一个河流国家，但纯净饮用水并不是廉价商品。城市中的大多数人都烧开水来喝水，村庄的人们直接拿管井里的水，这些水可能含有大量的重金属，如砷。太阳能仍然是一种廉价且非常有用的可再生技术，该技术可以在孟加拉国的屋顶上的任何地方作为纯净水源广泛使用。本文的目的是为孟加拉国南部地区找到一种低成本的便携式且易于维护的无源太阳能蒸馏器。对无源太阳能蒸馏器的所有参数进行了研究，发现带有无源电容器，内部和外部反射器，黑色棉芯以及最佳设计值的倾斜阶梯式太阳能蒸馏器可能是理想的，这将使产量最大化。最后，使用参数的最佳值来提出便宜的设计。