Hey all,
I would like some help with determining when ice will form on a heat exchanger surface other than trial and error. We run numerous PHE with set of -1.5degC supplying 2degC chilled water with no icing issues, blast tunnels down to 6degC with set of -6degC with no defrost other than off cycle needed. I have built ice banks with set of -12degC and ice started to form at 8degC water temperature.

The reason I ask is we have a loading areas at a Coolstore complex around +10degC to +5degC that require some optimization and lowering of set but I can't take the risk of turning the fan coils into ice blocks. Assume the coils have enough capacity and reach set point for an off cycle defrosting, there is no supplementary defrost installed.


Thanks