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Thread: Calculating GPM

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  1. #1

    Calculating GPM

    Hello all. New to the site, been in the trade about 15 years. Got a new employer, and we do work on chillers ( air cooled screw, scroll, and recip). How do you know you have proper water flow (gpms) through a chiller?How do you know what it's supposed to be? I appreciate feed back. I tried to do a search on here, but came up empty.

  2. #2
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    The iom manuals of the machine will tell you the design gpm, minimum and maximum for that particular machine. At the machine using the same gauge to measure supply and return pressure with the chiller at full load, you apply this formula:

    Gpm across barrel
    Gpm (actual)=design gpmx(square root of actual divided by design)
    A=234 x sq rt of 4/6

  3. #3
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    2.5 gpm per ton for chilled water

    look at your pumps and read gpm and head

    if pump is correct and gpm is correct

    find out what the pressure drop through the chiller is supposed to be
    if it is correct

    then

    use

    gpm x 500 x delta t

    this should get you close

    then you will have to learn approach.

    frank
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  4. #4
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    evansville indiana
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    A lot of Ioms will have a graph to assist you in calculating GPM.

    Design can vary per application .

    There are rules of thumb.

    There are math calculations to perform .

    I'll look around and see if I can come up with something for you....
    mikeacman

  5. #5
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    Quote Originally Posted by supertek65 View Post
    2.5 gpm per ton for chilled water

    look at your pumps and read gpm and head

    if pump is correct and gpm is correct

    find out what the pressure drop through the chiller is supposed to be
    if it is correct

    then

    use

    gpm x 500 x delta t

    this should get you close

    then you will have to learn approach.

    frank
    Ya I forgot the part about the pump. Oops!

    Thought I was gonna get an atta boy from ya....ya not!

  6. #6
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    Here it is.
    Attached Images Attached Images

  7. #7
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    Sep 2004
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    Kansas City, Kansas, United States
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    when you can snatch the pebble from my hand!
    it will be time for you to leave grasshopper!

    http://www.youtube.com/watch?v=gASY7Lj5GPQ


    Quote Originally Posted by ryan1088 View Post
    Ya I forgot the part about the pump. Oops!

    Thought I was gonna get an atta boy from ya....ya not!
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  8. #8
    You guys are awesome. Thanks for the replies.

  9. #9
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    Take a look at this.
    Attached Images Attached Images

  10. #10
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    Upper Michigan
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    Quote Originally Posted by supertek65 View Post
    when you can snatch the pebble from my hand!
    it will be time for you to leave grasshopper!

    http://www.youtube.com/watch?v=gASY7Lj5GPQ
    Bruce lee got the shaft on that one!

  11. #11
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
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    i think you are correct!

    of course they are both dead now!

    i looooove bruce lee!

    have you ever seen him play ping pong with wooden matches???????? FREAK!!!!!!!!



    Quote Originally Posted by Joehvac25 View Post
    Bruce lee got the shaft on that one!
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  12. #12
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Quote Originally Posted by supertek65 View Post
    i think you are correct!

    of course they are both dead now!

    i looooove bruce lee!

    have you ever seen him play ping pong with wooden matches???????? FREAK!!!!!!!!
    I have seen the old ping pong videos, he's the ****. If you want your bubble burst read the book "bruce lee unsettled matters".


    They found David in a bad spot lol.

  13. #13
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
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    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

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