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In a solar still, impure water is contained outside the collector, where it is evaporated by sunlight shining through a transparent collector. The pure water vapour condenses on the cool inside surface and drips into a tank. Distillation replicates the way nature makes rain. The sun's energy heats water to the point of evaporation.
Water production is proportional to the area of the solar surface and solar incidence angle and has an average estimated value of 3–4 litres per square metre (0.074–0.098 US gal/sq ft). [2] Because of this proportionality and the relatively high cost of property and material for construction, distillation tends to favor plants with ...
A solar still is a simple way of distilling water, using the heat of the Sun to drive evaporation from humid soil, and ambient air to cool a condenser film. Two basic types of solar stills are box and pit stills. In a pit still, impure water is contained outside the collector, where it is evaporated by sunlight shining through clear plastic.
Solar distillation mimics the natural water cycle, in which the sun heats sea water enough for evaporation to occur. [55] After evaporation, the water vapor is condensed onto a cool surface. [55] There are two types of solar desalination. The first type uses photovoltaic cells to convert solar energy to electrical energy to power desalination.
Solar water disinfection, in short SODIS, is a type of portable water purification that uses solar energy to make biologically-contaminated (e.g. bacteria, viruses, protozoa and worms) water safe to drink. Water contaminated with non-biological agents such as toxic chemicals or heavy metals require additional steps to make the water safe to drink.
The draft plan published on Wednesday would update an Obama-era policy that established special zones for solar projects in six states - Arizona, California, Colorado, Nevada, New Mexico and Utah.
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