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MED (Multi-Effect Distillation) is similar to MSF, but only makes use of devices called Effect instead of “Stage” from MSF. The MED method has the advantage of reducing energy consumption if applied with dump heat, and is mostly used for medium-capacity desalination plants. Its principle is to spray seawater on the outside of metal tubes to condense the vapor flowing inside. The seawater outside the tube boils to generate steam which flows into the tubes to condense in the next cycle. The process is then repeated. Since the outside of the tubes is maintained in a vacuum, the seawater boils even when it is sprayed at a low temperature. The big difference from MSF is that it is relatively smaller in size as it is operated at low temperatures (60 ~ 70 ℃) but is more efficient and consumes less electricity per unit production.
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