Water to be chilled enters the chamber continuously and a small portion is evaporated. It takes about 1060 BTU/lb to evaporate water and the removal of this much heat with the vapor cools the liquid until its temperature comes to equilibrium with the absolute pressure. This water flash or boiling at low pressure creates the natural refrigeration of the remaining water in the chamber.

The vapor is compressed by the steam jet booster to an absolute pressure where steam and vapor can be condensed with the available condensing water supply. The chilled water, which is completely deaerated, is pumped from the flash chamber and circulated to the process, in either a closed or open system.

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