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Dual Work Exchanger Energy Recovery

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In the 1990's, the Dual Work Exchanger Energy Recovery, or DWEER, was developed by Calder AG for use in the Caribbean. Sea Water Reverse Osmosis (SWRO) needs high pressure and some of the reject stream can be reused by using this device. According to Calder AG, 97% of the energy in the reject stream is recovered. The DWEER system utilizes a piston and valve system in a high pressure batch process with large pressure vessels, similar to a locomotive, to capture and transfer the energy lost in the membrane reject stream. It's advantage is it's high efficiency rate, but suffers from complex and large mechanical complexity which in turn is exposed to corrosion of seawater due to its metal composition. [1]

  1. ^ Energy Recovery Incorporated website