25 Aug '14, 1pm

The Power of Salt

The Power of Salt

Pressure retarded osmosis (PRO) is a method of producing renewable energy from two streams of a different salinity. Illustration: Jose-Luis Olivares/MIT The researchers evaluated an emerging method of power generation called pressure retarded osmosis (PRO), in which two streams of different salinity are mixed to produce energy. In principle, a PRO system would take in river water and seawater on either side of a semi-permeable membrane. Through osmosis, water from the less-salty stream would cross the membrane to a pre-pressurized saltier side, creating a flow that can be sent through a turbine to recover power. The MIT team has now developed a model to evaluate the performance and optimal dimensions of large PRO systems. In general, the researchers found that the larger a system’s membrane, the more power can be produced — but only up to a point. Interestingly, 95 percent...

Full article: http://www.renewableenergyworld.com/rea/news/article/2014...

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