using frozen water bottles to keep ferm temps down? - Home Brew Forums
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Old 07-19-2009, 05:53 AM   #1
bkov
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hey, i read through a bunch of threads on it but got mixed results. when using frozen bottles to keep fermentation temps down, is it best to surround the carboy with water and let the frozen bottles float in water....

or just put the frozen bottles around the carboy and no water at all?

i have my glass carboy in a cooler full of water(no lid though), and ive been adding frozen bottles, usually 2 at a time....but they melt VERY quick



 
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Old 07-19-2009, 05:53 AM   #2
bkov
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i also have a wet tshirt on the carboys. no spare fan right now



 
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Old 07-19-2009, 05:58 AM   #3
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With the carboy in the tub I usually fill it about 1/2 way then add the bottles with frozen water.

As previous stated adding a t-shirt over the carboy so the water wicks up also

Adding a fan into the equation works well also.

The trick is to keep the brew in the carboy at its fermenting temp range.

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Old 07-19-2009, 06:01 AM   #4
bkov
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northern....essex county(973)

its been a cool summer for the most part so far but its finally starting to get hot during the days but drops cool at nights still. today my house temperature was 82F

 
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Old 07-19-2009, 06:02 AM   #5
bkov
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so how do you keep the bottles from melting so quick? doesnt this make inconsistent ferm temps?

 
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Old 07-19-2009, 06:09 AM   #6
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It's fine that they melt quickly. The water around the carboy acts as a thermal buffer. It lowers the temperature of the beer in the carboy gradually as the whole system comes to equilibrium.
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Old 07-19-2009, 06:12 AM   #7
desertbronze
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5-6 gallons of wort in the fermenter will not change temp quickly. The goal is to hold a steady temp in the carboy. Put a stick-on thermometer strip on the fermenter and adjust the temp as needed with ice bottles in the water. Don't be concerned with the ice - just use what is needed to keep the wort at the desired temperature.
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Old 07-19-2009, 06:39 AM   #8
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DO NOT PUT A STICK ON THERMOMETER STRIP ON YOUR CARBOY!!!

The water will seperate the temp strip from the plastic cover and it will be ruined permanently if immersed.

Use a dial thermometer in the water.

To save $$$ on therm strips use them only when your carboy/bucket will not be added to a tub of water. How? Easy...

First off, do not pull the backing paper off of the strip. Place 3" wide packaging tape over the strip and fold the top edge over about 1". Whenever you want to place a fermenter in a tub of water you can remove the taps and strip and reuse it on another fermenter. When the tape goes bad just cut it off and add another piece of tape.
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Old 07-19-2009, 05:02 PM   #9
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Quote:
Originally Posted by bkov View Post
so how do you keep the bottles from melting so quick? doesnt this make inconsistent ferm temps?
If you're using a cooler and ice bottles then the temps stay pretty steady. I change out my bottles 1-2 time s a day during peak fermentation periods and my temps fluctuate maybe 3 degrees.

 
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Old 07-19-2009, 07:12 PM   #10
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Quote:
Originally Posted by homebrewer_99 View Post
DO NOT PUT A STICK ON THERMOMETER STRIP ON YOUR CARBOY!!!

The water will seperate the temp strip from the plastic cover and it will be ruined permanently if immersed.

Use a dial thermometer in the water.
Thats what mine did. I use a t-shirt and ice in the summer, and an aquarium heater in the winter. The stick on lasted about 2 batches.


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