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  1. #1
    Join Date
    Mar 2007
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    Cooling Tower CFM Per Ton



    Hi to every one
    As a ROT (Rule Of Thumb) it is said:

    2.4 GPM/Ton cooler water flow.

    400 CFM/Ton air handling unit air flow.

    3 GPM/Ton cooling tower water flow.

    (??) CFM/Ton cooling tower air flow.


    This last ROT is unknown for me.Though there is many reservations about the the accuracy of ROTs. I see that ROTs are a Course approaches versus Fine approaches of calculations.Tough... they facilitate fast evaluations and views. I will be very thankful to answer me and any additional help for advance.



  2. #2
    Join Date
    Jan 2006
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    Croatia
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    Re: Cooling Tower CFM Per Ton

    Hi, afak

    Quote Originally Posted by afak View Post
    Hi to every one
    As a ROT (Rule Of Thumb) it is said:

    2.4 GPM/Ton cooler water flow.

    400 CFM/Ton air handling unit air flow.

    3 GPM/Ton cooling tower water flow.

    (??) CFM/Ton cooling tower air flow.


    This last ROT is unknown for me.Though there is many reservations about the the accuracy of ROTs. I see that ROTs are a Course approaches versus Fine approaches of calculations.Tough... they facilitate fast evaluations and views. I will be very thankful to answer me and any additional help for advance.

    Check this, please....

    https://books.google.hr/books?id=xPD...20flow&f=false

    https://www.google.hr/url?sa=t&rct=j...qmAiu-vGCchdPg


    https://www.scribd.com/doc/18185824/...gn-Thumb-Rules


    Hope this will be of some help...

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

  3. #3
    Join Date
    Mar 2007
    Location
    Iraq
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    Re: Cooling Tower CFM Per Ton

    Thank you Josip. Scanning more than one cooling tower specifications sheets it seems round 250 CFM/Ton.
    "Nominal tons of cooling represents the capability to cool 3 USGPM
    of water from a 95F entering water temperature to an 85F leaving
    water temperature at a 78F entering wet-bulb temperature"
    (manufacturer notice).

    Glad to hear any corrections to this notice and to what extent could be used as ROT.

  4. #4
    Join Date
    Jan 2006
    Location
    Croatia
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    Re: Cooling Tower CFM Per Ton

    Hi, afak


    Quote Originally Posted by Josip View Post

    whatever is value ... it will be always ROT ... all depend on your choice ...

    for me ROT is only good when you speak with your client to give some general picture about plant, unit etc ... at the end one real calculation must be done ... as you wrote in your first post ....

    ...as your client I wouldn't accept your offer without full calaculation


    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

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