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  1. #1
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    12kw 6000 liters Waterchiller pulldown time



    customer has a small 12kw waterchiller they want to hook onto there 6000liter uninstalled plastic buffer tank, I dont have any flow rates but ive been trying to work out how long it would take to pull down from 20deg to 7degC tank only no other heatload - doesnt have to be accurate just a ruff idea but I am struggling to find a method, can anyboy help out or point me in the right direction

    thanks



  2. #2
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    Re: 12kw 6000 liters Waterchiller pulldown time

    http://processheatingservices.com/wa...me-calculator/

    or very roughly,

    specific heat of water 4.18 KJ/kg k
    1 Kg for 1 Litre of water
    12 KJ/s cooling from chiller
    13 degree temp change

    Q=m x c x change in temp
    Q=6000Kg x 4.18 KJ/Kg K x 13 degrees
    Q=326040 KJ

    Time taken with 12 Kw of cooling,
    326040 KJ / 12 KJ/s / 60 seconds / 60 minutes = about 7.54 Hours

    Lots of stuff not taken into account for though.
    Last edited by seanf; 16-12-2018 at 11:25 AM.

  3. #3
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    Re: 12kw 6000 liters Waterchiller pulldown time

    Exactly what I was after, thanks very much!

  4. #4
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    Re: 12kw 6000 liters Waterchiller pulldown time

    Hi
    the actual time is more than 7.54 h
    you lose a lot of energy in plastic tank and piping and....

  5. #5
    Join Date
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    Re: 12kw 6000 liters Waterchiller pulldown time

    Quote Originally Posted by mbc View Post
    Hi
    the actual time is more than 7.54 h
    you lose a lot of energy in plastic tank and piping and....
    Thats okey we are just going for rough numbers, we also have 15 hours up our sleeve to pre chill the tank, I was thinking more of around 25kw but in this case they have an old 12kw system in storage we can temporary install fist and go from there

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