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Co-ordination Action for Autonomous Desalination Units ... - ADU-RES

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4. OVERVIEW OF DESALINATION <strong>RES</strong> APPLICATIONS<br />

4.1 WIND ENERGY DRIVEN REVERSE OSMOSIS TECHNOLOGY<br />

4.1.1 <strong>Autonomous</strong> Wind RO system without batteries, C<strong>RES</strong>T, Loughborough Univ.,<br />

UK<br />

a. Introduction<br />

A small-scale wind-powered seawater-RO system without batteries was<br />

demonstrated in 2003 at C<strong>RES</strong>T, Loughborough University, UK. The system<br />

operated at variable flow and variable pressure in accordance with the variable<br />

power available in the wind. The system pressure ranged between 38 to 51 bar<br />

during this test. [M. Miranda, 2003].<br />

Pic. 1 View of the RO unit of C<strong>RES</strong>T pilot plant<br />

b. System Description<br />

Energy recovery is provided by a Clark pump from Spectra Watermakers Inc., and<br />

the use of a variable recovery ratio extends the energy efficiency over a very wide<br />

operational range, allowing the system to make efficient use of the available wind<br />

power without need of batteries.<br />

The feed water used <strong>for</strong> testing was straight NaCl solution at around 32,800 mg/L, to<br />

emulate the osmotic pressure of seawater. Its temperature was held at 25°C and the<br />

WP2 <strong>ADU</strong>-<strong>RES</strong> 17

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