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General Category => Equipment and Software => Topic started by: ndcube on November 18, 2009, 04:44:49 PM

Title: Condensation in Chest Freezer
Post by: ndcube on November 18, 2009, 04:44:49 PM
I got my chest freezer rigged up with a temp controller.  It's been at 35F for a few days now and it's getting some condensation inside.

Is this normal?  Maybe I'm opening it too much checking things or it's sneaking in where the thermister wire goes under the lid.

What do you do about it?  Just wipe it down with a paper towl every so oftern?

Thanks,
Title: Re: Condensation in Chest Freezer
Post by: a10t2 on November 18, 2009, 04:53:27 PM
http://www.amazon.com/gp/search/?brand=Eva-dry&ref_=bl_sr_hpc&node=3760931 (http://www.amazon.com/gp/search/?brand=Eva-dry&ref_=bl_sr_hpc&node=3760931)

Three of the 500s keep a 15 cu ft freezer bone dry.

edit: I didn't even notice the price. If you're willing to wait I think they regularly get marked down to $12-15.
Title: Re: Condensation in Chest Freezer
Post by: ndcube on November 18, 2009, 05:05:59 PM
Thanks for the tip.

I wouldn't have guessed a mini-dehumidifier.  For some reason I was under the impression they didn't work well in the cold.  Probably because there's less humidity in my basement in the winter.
Title: Re: Condensation in Chest Freezer
Post by: Kaiser on November 18, 2009, 05:37:55 PM
I use DampRid: http://www.amazon.com/gp/product/B000UGTLWC

You can "recharge" the crystyals by baking out the water in the oven.

Kai
Title: Re: Condensation in Chest Freezer
Post by: ndcube on November 18, 2009, 05:47:24 PM
What procedure do you use to bake the crystals?  Temp, time, spread them out on a sheet?
Title: Re: Condensation in Chest Freezer
Post by: Kaiser on November 18, 2009, 06:00:39 PM
What procedure do you use to bake the crystals?  Temp, time, spread them out on a sheet?

I haven't done that yet. I figure I just place them on tin foil set in a pot or baking sheet and bake them at 300-400F for a while. When they absorb water they get all gooy and translucent. Once they look white again they should be recharged. The crystals are just a very hygoscopic salt that attracts water from the atmosphere. That water can be driven off with heat. They also sell refill packs.

If you don't open the chest freezer/fridge much, one charge should last for a while.

Kai
Title: Re: Condensation in Chest Freezer
Post by: Kaiser on November 18, 2009, 06:04:50 PM
BTW, Calcium Chloride is very hygroscopic too. So you may just place a pan with CaCl2 in the freezer if you already have enough CaCl2 on hand. That is also the reason why brewing salts should be kept in sealed containers. Some of them attract water from the air which will dilute their strength and you end up adding less than you think.

Kai
Title: Re: Condensation in Chest Freezer
Post by: ndcube on November 18, 2009, 06:54:53 PM
Thanks Kai.
Title: Re: Condensation in Chest Freezer
Post by: deepsouth on November 18, 2009, 09:21:25 PM
i just started using damp rid.   picked it up from home depot.

can't stand cleaning mold out the keezer every week.
Title: Re: Condensation in Chest Freezer
Post by: zorch on November 19, 2009, 12:54:03 AM
http://www.amazon.com/gp/search/?brand=Eva-dry&ref_=bl_sr_hpc&node=3760931 (http://www.amazon.com/gp/search/?brand=Eva-dry&ref_=bl_sr_hpc&node=3760931)

Three of the 500s keep a 15 cu ft freezer bone dry.

edit: I didn't even notice the price. If you're willing to wait I think they regularly get marked down to $12-15.

+1 on the Eva-Dry.  I have 1 in my 7.5 cu ft freezer, and it works quite well.
Note that essentially all this is is a plastic box filled with silica gel beads.  But it has a built-in heating element - Just plug the whole thing into a wall socket overnight and it's good to go again.

You can also use Damp-rid, or some other similar product.  I do like that the Eva-Dry is self contained, so nothing to spill.