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Thread: Glycol temperature setting

  1. #1
    Join Date
    Jun 2005
    Posts
    52

    Glycol temperature setting

    I have a roof mounted glycol chiller being installed next week, and was wondering what temperature people typically run their glycol at. I was thinking perhaps -10C.

  2. #2
    Join Date
    Jan 2003
    Location
    Palau
    Posts
    1,621
    In my opinion, -10C is far too cold. In case of accidental solenoid failure (you'd be amazed how often this happens), you don't want to freeze the beer, crash a fermentation prematurely, etc. Also don't want to ruin your chiller by freezing the heat exchanger solid if your glycol mix becomes too thin. I recommend -2C to -4C. If the chiller and the circuit are designed properly, you will get great results. Cheers!

  3. #3
    Join Date
    Oct 2002
    Location
    Stavanger Norway
    Posts
    320
    Make sure your resivour is well insulated. I noticed mine stays about 1-3C higer than the setting depending on outside temps. (its out back)

  4. #4
    Join Date
    Dec 2003
    Location
    London, United Kingdom
    Posts
    181
    i believe ours is at -3 degC, i think -10degC is too cold as well.

    cheers,

    alex

  5. #5
    Join Date
    Dec 2003
    Posts
    53
    Keeping glycol too cold can cost you big $. You will want to keep your glycol as warm as possible while getting the job done. That temperature all depends on what your process is.

    The amount of energy for every degree drop is not linear. In other words, if lowering your glycol from -3 to -4 takes X amount of energy it will take more than X (by a significant amount) to go from -4 to -5.

    Some brewers get convinced that since their system is under capacity that turning the temperature down will give you more on demand heat capacity. While this is true the gains are slight and the costs are large (energy and maintenance).

    Hope this helps.
    Last edited by Tbrew; 09-17-2005 at 09:26 PM.

  6. #6
    Join Date
    Oct 2003
    Location
    Santa Rosa CA USA
    Posts
    962
    I agree with Tbrew completely. First there's extra energy cost of being too cold, next it overworks your compressor, next it thermally confuses the heck out of your beer from too severe of a temp shock between the cooling jacket and the rest of the tank. Best is to figure 5 For so difference between the coldest you want the beer and the glycol temp. The smaller difference the better. Try it at 5 F difference and see how it works. Obviously the glycol/water ratio must be enough not to freeze. Since glycol is so dang expensive, there's another reason to not go too cold.
    Last edited by Moonlight; 09-19-2005 at 12:44 PM.

  7. #7
    Join Date
    Nov 2004
    Location
    Hermosa Beach, California, USA
    Posts
    15
    26F is about where you want to be. Plenty cold. ABout 30% glycol solution has worked best for me. Hopefully your system produces the right amount of BTU's for your tank volumes
    Mike

  8. #8
    Join Date
    Jun 2003
    Posts
    194
    Ditto Mike above...26 F. Keep it simple and don't waste money
    superchilling. I use a 50-70 gal reservior for three 7 BBL and
    two 14 BBL fermenters.

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