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Old 04-30-2009, 02:48 AM   #1
Yorg
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I bought a 150l chest freezer to contain liquid, which I'll use through my Chiller.
I will pre-chill with tap water, but then switch to the chest freezer, using a pond pump to move the liquid through the chiller.
The night before a brew, I will turn on the freezer on and cool the liquid to around 0C - I reckon the pond pump could probably cope with that.
The aim is to get quickly and easily to lager pitching temps.

Question: What should the liquid be, assuming I have a reliable seperation of the wort and coolant paths? Water, glycol, oil

(I am thinking that thermal mass, given finite volume, would give me the maximum cooling potential.)

??

 
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Old 04-30-2009, 03:01 AM   #2
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What about antifreeze? Then you can crank that freezer down as far as it will go. Of course make sure all connections are FAR away from your beer so there is no chance of any getting in there.
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Old 04-30-2009, 03:12 AM   #3
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Quote:
What about antifreeze? Then you can crank that freezer down as far as it will go. Of course make sure all connections are FAR away from your beer so there is no chance of any getting in there.
I agree. This is probably the most efficient. Also, there is stuff on the market that is not lethal. Finally, we use to have to add glycol to some closed systems where I use to work. There was a cheapo dye that we put in it and if it ever leaked, it was easy to spot. I'm sure someone on here knows what it is. You could use brine, it would stand a little lower temp and if it leaked into your beer, somehow, you could just add more lime and say it is Miller Chill! Luck - Dwain

 
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Old 04-30-2009, 04:37 AM   #4
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I think you'd be better off using it to make a large volume of ice. Fashion yourself a large ice tray to make like 50 pounds of ice at a time, add water and pump that. It's a way to ensure no chemicals near your brew. You can use propylene glycol to lower the freezing point, but it's not cheap. It's less toxic than ethylene glycol though.
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Old 04-30-2009, 08:27 AM   #5
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They do make a less toxic automotive antifreeze. You can pick it up at any auto parts store. As far as the dye goes, they also make UV dye for the antifreeze. Of course you would have to hit the wort with UV light to see if the dye leaked. No clue if that would work or not, might take some testing. As long as the connections are away from the wort I don't see any reason not to use antifreeze.

SIERRA Antifreeze Home Page These guys make the antifreeze I referred to.
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Old 04-30-2009, 10:54 AM   #6
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How about RV antifreeze? It's non-toxic. We use it every year to winterize our camper.

 
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Old 04-30-2009, 01:30 PM   #7
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http://www.homebrewtalk.com/f51/temp...ntation-81596/

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Old 04-30-2009, 02:56 PM   #8
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If you use an antifreeze, you'd be better off dropping the temp well below 0C. If you're just going down to 0, it would be better to make ice because it will have more cooling power (highly technical term) than a liquid at 0C. Is the fear about overchilling the pump impeller? I wonder how cold you can go before it's a problem.
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Old 04-30-2009, 03:20 PM   #9
chris1979
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why not just a salt water solution. would be safe to drink if you came up with a leak.

Saltwater has a much lower freezing point (the freezing point is the temperature where something freezes) than freshwater does. And the more salt there is in it, the lower the freezing point gets. So in order to know the exact temperature that it’s going to freeze, you have to know just how salty it is. For saltwater that’s as saturated as it can possibly get (i.e. there’s no way to dissolve any more salt in it no matter how hard you tried), the freezing point is -21.1 degrees Celsius. This is when the saltwater is 23.3% salt (by weight).
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Old 04-30-2009, 03:40 PM   #10
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saltwater is highly corrosive

 
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