Sea Water/Brackish Water into Fresh Water Using Solar Energy

Lack of fresh water is a general concern and will increasingly became a threat to societies in the future. One of the main ways to obtain drinking water in hot, dry countries surrounded by sea or ocean is trough desalination. Technofluids developed a high efficiency and low cost desalination process by exploiting solar energy.

The power sector may have another tool to meet tomorrow’s energy demand reducing both costs and energy consumptions: to provide the mechanical energy required for the traditional Reverse Osmosis desalination, which is energy intensive due to the high throughput.

It is the use of a low temperature Organic Rankine Cycle(ORC) in combination with a parabolic reflector that focuses the direct solar radiation on a linear receiver, the absorber tube have an high solar absorbance and low thermal emittance at elevated temperatures. Through the absorber tube a working fluid, which is heated by the concentrated solar radiation, is flowing. This leads to numerous applications for parabolic troughs.

Since there is a variety of components for parabolic troughs, a wide temperature range can be reached this leads the efficient combination with the Torini’s Thermo Volumetric Motor Generator (TTVM/G®) to generate electrical power over Organic Rankine Cycle to process heat and building cooling, going from high temperatures to low ones.

The use of parabolic trough collectors in combination with TTVM/G® is the cheapest way to transfer solar radiation into electrical power.

The biggest advantages of parabolic trough concentrators compared to other systems is that they are already commercially used over 20 years.

Exploitation of solar energy is also limiting the release of heat-trapping emissions.

Considering that for every BTU of coal, oil or natural gas burned in a combustion turbine only 35 percent of that is converted into useful power, the other 65 percent is lost forever in the form of waste heat that is discharged into the environment, water desalination by the combination of parabolic trough concentrators and TTVM/G® is the tool that could gain every increasing credence if natural gas and oil prices turn volatile. Said system also eliminated the need for energy storage and exhibited higher efficiency translating to higher fresh water production rates.

Commercial implementation of the parabolic concentrators in combination with TTVM/G® should enable climates such as those in MENA countries to exploit their abundant solar energy to produce fresh water from equally abundant sea water.

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Solid-Liquid Separation

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