Its principle is to spray the seawater on the outside of metal tubes to condense the vapor flowing inside. The seawater outside the tube boils to generate the steam which flows into the tubes to condense in the next cycle. The process is then repeated. Since the outside of te 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 a low temperature (60 ~ 70 ℃) but is more efficient and consumes less electricity per unit production.
