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  1. #1
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    NH3 thermosiphon evaporator calculation



    hi everyone,
    I have a nh3 refrigeration project which need to use a thermosiphon evaporator. I made a calculation but I'm not sure with the result.so I need someone can make a check on my calculation.

    Qe=2300KW,Te=-38℃,cacl2 brine 29% by wt, -30/-35℃,

    the calculation:
    area=656m2, ¢20*2, l=8000, number=1310,tube pitch=26, shell id=1010mm, recirculation rate=4,
    fouling resistence:shell/tube 0.00017/0.000088 m2.k/W

    it's the first time to do this so i need your help.

    many thanks!

    cygbob



  2. #2
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    Re: NH3 thermosiphon evaporator calculation

    A couple of things, what program did you use to do the calculation and did you allow for any submergence on the evaporator temperature?

    Ken

  3. #3
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    Re: NH3 thermosiphon evaporator calculation

    I think we have to speak here of a coil or heat-exchanger instead of an evepoartor.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  4. #4
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    Re: NH3 thermosiphon evaporator calculation

    I made the program by myself, the in-tube heat transfer coefficient get by the Gungor and Winterton(1986) equation.
    Cacl2 brine is out of the tubes, Ammonia is evaporating in the tube. The recirculation rate=4.
    I'm not sure what the 'submergence' means

    Thanks,
    cygbob

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