High humidity in cold room

[Psychro]

Hi Nimamu

A conventional air curtain is a waste of time as this can often introduce more moisture into the cold room - despite manufacturers claims.

The modern method of reducing ingress of moisture into cold stores is to use very dry air from a desiccant dehumidifier. A number of leading UK supermarket chains are now using this method in their cold storage depots The dry air duct outlet is designed to produce a curtain of dry air down across the face of the doors (on the warm side). I have recently supplied a number of desiccant dehumidifiers for use in supermarket cold stores where the DH units supply air at minus 25°Cdp. This system dramatically reduces ice build up on door frames, ceilings and floors (health & safety) and also improves efficiency of dx cooling coils (reduced latent load and defrost cycles). If the dehumidifiers are located in the loading area (2-5°C) then these areas also benefit from a much reduced humidity.