dry air pacs and dessicant dont work?

Question

i need a device or ideas for a device to dry air being pushed into a freezer from a warm humid (appx. 60 pct) area to avoid the ice plug at the temperature. transformation point. camon all u inestines were in this together! lol ! any ideas are appreciated

Answer 1

Ways used to dry gases industrially include aluminium silicate (commonly known as molecular sieves) and ethylene glycol scrubbers. Commonly there are two molecular sieve driers one being regenerated with hot gas and then cooled whilst the other is in service. The ethylene glycol needs to have the water removed in a stripping tower by heating. I am unsure of the scale of air flow you are talking about but see no reason why desiccants shouldn't work if they are replaced often enough and are arranged such that moist air cannot bypass.

Answer 2

Use 147psi compressed air , when it expands back down to atmospheric pressure it will be no more than 10% RH.

This is the basis of how 10% RH is generated in a two pressure RH calibrator.


EDIT:
It seems to me that you need to cool the air to the dew point before it enters the freezer. Since air going into the freezer is displacing air which must leave the freezer have you considered using an Air to Air heat exchanger?
The cold air leaving the freezer is used to gently cool the warm moist air entering. Since this cooling occurrs outside the freezer you should not encounter temps cold enough to cause icing within the exchanger. This would allow you to dry the incomming air and easily drain the condensate.
You would also benefit from increased economy as you are precooling incomming air with the cool air which otherwise would have just been vented.