Hi all

Falling film evaporators, usually operated in association with ammonia recirculation systems, claims to drop water temperature within 1 oF of freezing point of water (e.g. Instant chillier by Chester-Jensen). These instant chillers (evaporators) are made of short gas flow corrugated plate heat exchangers arranged in a series to obtain required surface area that correspond to the dT and flow rate of chill water required.

Could the experienced members point out the pros and cons of these instant chillers when used in applications for obtaining chill water (at about 33 oF) for process applications.

More importantly, in the case of dropping water temperature within very close limits to freezing I am wondering how ice build up on the plates, if any due to some reason or other, are avoided under all running conditions including steady full load or not so steady part load etc?

raja