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  2. Solar still - Wikipedia

    en.wikipedia.org/wiki/Solar_still

    Solar still built into a pit in the ground "Watercone" solar still. A solar still distills water with substances dissolved in it by using the heat of the Sun to evaporate water so that it may be cooled and collected, thereby purifying it. They are used in areas where drinking water is unavailable, so that clean water is obtained from dirty ...

  3. Atmospheric water generator - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_water_generator

    State-of-the-art AWG for home use. An atmospheric water generator (AWG), is a device that extracts water from humid ambient air, producing potable water. Water vapor in the air can be extracted either by condensation - cooling the air below its dew point, exposing the air to desiccants, using membranes that only pass water vapor, collecting fog, [1] or pressurizing the air.

  4. Solar pond - Wikipedia

    en.wikipedia.org/wiki/Solar_pond

    When water at the bottom of the pool is heated, it becomes less dense than the cooler water above it, and convection begins. Solar ponds heat water by impeding this convection. Salt is added to the water until the lower layers of water become completely saturated. High-salinity water at the bottom of the pond does not mix readily with the low ...

  5. Solar-powered desalination unit - Wikipedia

    en.wikipedia.org/wiki/Solar-powered_desalination...

    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.

  6. Micro hydro - Wikipedia

    en.wikipedia.org/wiki/Micro_hydro

    Gravitation water vortex power plant : part of the river flow at a weir or natural water fall is diverted into a round basin with a central bottom exit that creates a vortex. A simple rotor (and connected generator) is moved by the kinetic energy. Efficiencies of 83% down to 64% at 1/3 part flow. [citation needed]

  7. Passive solar building design - Wikipedia

    en.wikipedia.org/wiki/Passive_solar_building_design

    Fundamental passive solar hot water heating involves no pumps or anything electrical. It is very cost effective in climates that do not have lengthy sub-freezing, or very-cloudy, weather conditions. [35] Other active solar water heating technologies, etc. may be more appropriate for some locations.

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