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19-11-2007, 03:37 AM #1
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
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24-11-2007, 05:15 PM #2
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
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25-11-2007, 12:50 PM #3
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.
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27-11-2007, 10:00 AM #4
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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