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  1. #1
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    chiller capacity formula & calculation...


    halo, can someone guide me to start my project...

    - i need 600 liter chilled water per hour
    - evaporator inlet water temp 37c
    - evaporator outlet water temp 15c

    thanks...
    and what is the different between refrigeration capacity and cooling capacity??
    Last edited by ah fai; 30-10-2010 at 06:43 AM.



  2. #2
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    Re: chiller capacity formula & calculation...

    2.47 TR u can close to 3TR

    How...

    TR=(GPM*(Temp in - Temp out))/24

    Its quik form to calculate a chiller capacity.

    Best regards

  3. #3
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    Re: chiller capacity formula & calculation...

    3TR mean chiller cooling capacity right? how about comppressor size?

    best regrads

  4. #4
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    Re: chiller capacity formula & calculation...

    hi, ah fai.

    ohh..... yes
    1 TR = 12,000BTU
    3 TR or RT = 36,000BTU
    u can use a tipical air condition compressor for R22 or R410 system.

  5. #5
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    Re: chiller capacity formula & calculation...

    thanks you so much friend...
    i think i will go for bitzer

  6. #6
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    Re: chiller capacity formula & calculation...

    halo paco..
    for select the condenser, expension device and evaporator, its depends on total cooling capacity??
    any formula???
    and what does it mean by compressor output m3/min?? for example bitzer.
    Last edited by ah fai; 02-11-2010 at 06:53 AM.

  7. #7
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    Re: chiller capacity formula & calculation...

    Hi there,

    First of all lets use SI units.

    Q = M x Cp X DT

    Q = Capacity in kW
    M = Liquid mass flow rate kg/s
    Cp = Liquid specific heat kJ/kg.K
    DT = Liquid temperature difference C

    Your mass flow rate is 0.166 kg/s

    Q = 0.166 x 4.18 x (37-15) = 15.2 kW

    You have to select a compressor which can give you 15.2 kW capacity at =3C evaporating and 50C condensing (if air cooled)

    NOW in actual life you can not have 37C input water into the chiller all the time.
    Normal water chiller when starts, the entering water is warm say 35C but after a little while the temperature goes down and chiller works perfectly.

    If entering temperature into the chiller is warm all the time then entering refrigerant will evaporate very quickly and suction pressure will be high.
    IOW your chiller will not work correctly.
    Normal chiller is designed for 12C to 7C.
    Cheers
    Even Einstein Asked Questions

  8. #8
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    Re: chiller capacity formula & calculation...

    thanks for ur help, im new to RE... how about condenser and evaporator???

  9. #9
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    Re: chiller capacity formula & calculation...

    Firstly you need to find out the total heat load calculation, then you would able to size up chilled water shell and condenser and compressor from an engineering technical data.

  10. #10
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    Re: chiller capacity formula & calculation...

    Hi all:
    what is GPM, I want 2 use this formula

  11. #11
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    Re: chiller capacity formula & calculation...

    GPM is gallons per minute. Imperial units. Anyway, for Ah fai, I don' think you will be able to find a suitable DX evaporator for 22K delta T. You will need to split the cooling at least twice or more, .

  12. #12
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    Re: chiller capacity formula & calculation...

    Hi Lana
    When u say that normally a chiller is designed to function between temperature range of 12 celsius-7 celsius..what do u mean by that?..is it the relantionship between chilled-medium ind and chilled
    medium out of evaporator?..or?......pardon me this dumb question, but im experiencing problems on interpretation as well......best regards

  13. #13
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    Re: chiller capacity formula & calculation...

    anyone can give me a layout of a chiller system w/ auto refill of water using pressure tank.

  14. #14
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    Re: chiller capacity formula & calculation...

    condenser capacity = evaporator capacity in kw + kw rating of the compressor motor

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