Temperature Change Calculator

Discussion in 'Feature Requests' started by cmaxwell, Nov 27, 2019.

  1. cmaxwell

    cmaxwell New Member

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    Would be good to have a calculator to tell me how long I need to leave a 20c 19L keg in a 2c fridge for the beer to get to 2c.
     
  2. Mase

    Mase Well-Known Member

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    #2 Mase, Nov 27, 2019
    Last edited: Nov 27, 2019
    That would depend on the shape and size of the fermenter and how well the air is circulated, etc. That being said, if you can keep notes on how long it takes for your system, you’ll know the next time as the cooling time for your equipment should be consistent.
     
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  3. cmaxwell

    cmaxwell New Member

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    Corny kegs are pretty similar in size and construction right?

    Also I am sure that there are only a handful of profiles for circulation that could be used. Wouldn't need to be perfect but surely this is not an impossible calculator.
     
  4. Mase

    Mase Well-Known Member

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    Well I can’t speak for BF, but not everyone will use a corny keg. So that doesn’t simplify. Plus you still have to consider whether it’s a freezer or a fridge (cooling times may differ) and is the air moving, how much space... etc etc. As I mentioned before, it’ll likely be more accurate with your own measurements.
     
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  5. Craigerrr

    Craigerrr Well-Known Member

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    Different size cornies as well.
    Dimensions and cooling capacity of fridge would also be variables.

    Curious, why do you want to calculate how long this takes?
     
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  6. cmaxwell

    cmaxwell New Member

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    In want to know how long I need to leave a keg in my fridge before I add geletin - without pulling a glass or two to check temps.
     
  7. Pricelessbrewing

    Pricelessbrewing Software Tester
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    It will also depend on the cycling of your particular fridge/keezer. The 2C reading is not going to be constant. I'm not sure if this is something BF is willing to create, I'll leave that to @Yooper if she think there's a big enough need for something like this.

    However, the milk the funk facebook group had created a coolship calculator awhile ago based on newtons laws of cooling that should be an okay approximation.

    The blue cells are input, the green cells are calculated values. To edit, and enter your data, you will need to make a copy of the sheet or download it. I've removed the surface air heat coefficient, was previously 12, and updated the input values to your situation. It estimates approximately 12 hours to get to 3C, ~17.5 hours to get to 2.5 C, and an infinite amount of time to get to 2C due to the formula being used.

    https://docs.google.com/spreadsheets/d/1eVJUwj0e8k5xrP18Q3sBgZ3DrNzCQZWsNi8rZaDb4aE/edit?usp=sharing


    tl;dr Leave it in there for a day.
     
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  8. Mase

    Mase Well-Known Member

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    With all the variables described above, I believe you will be better off doing some equipment testing with temperature checks periodically until you reach your desired temps. Document them and that’ll be more accurate than a “generic” type calculator that would be difficult to make accurate for everyone.
     
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  9. BOB357

    BOB357 Well-Known Member

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    If you're putting it in the fridge at room temperature, overnight works just fine. I use gelatin at 40F and get crystal clear beer.
     
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  10. Yooper

    Yooper Administrator
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    Yes, that's the way I'm leaning too unless someone can change my mind.
     

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