Water cooling HE
Water cooling HE
(OP)
Dear all,
I need your help.
I want to estimate what would be the surface reduction if replace air-fin coolers for water-cooled HE in gas cooling operation.
What are the key parameneter I shall to take into account? Is there any rules of thumb for such estimate?
Thanks!
Evgeny
I need your help.
I want to estimate what would be the surface reduction if replace air-fin coolers for water-cooled HE in gas cooling operation.
What are the key parameneter I shall to take into account? Is there any rules of thumb for such estimate?
Thanks!
Evgeny





RE: Water cooling HE
RE: Water cooling HE
Too many variables - incoming gas temp, outgoing gas temp, ambient air temp, incoming water temp, outgoing water temp.
Not sure what you're after. Surface area of water HE will be lower, but size of HX is different as the water needs to be contained.
Very vague question so vague answer.
Be more specific and we might get somewhere...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water cooling HE
You need to look at flows and temps, both the gas temps as well as the air and water temps.
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P.E. Metallurgy, Plymouth Tube
RE: Water cooling HE
The Heat Transfer Coefficient of Air is smaller than that of Water.
Best Regards,
Moon
RE: Water cooling HE
we sized air-cooled heat exchanger for gas cooling in arctic climate where temperatures are in range -25 - + 25 C. It gave quite efficient cooling with T approach around 10-12 C.
However I believe that applying cold sea water via closed water loop can improve the area and reduce size of HE.
What I would like to know for the moment is after assuming all Tin and Tout are same for gas and cooling media, how much you can improve the area for water cooling HE compared with air-cooled? T approach for water HE will be lower as well right?
RE: Water cooling HE
If you must use air, then warm air recirculation - winterizing may be required to avoid gas hydrates or other solids.
RE: Water cooling HE
your HX might reduce in size, but then you need a host of other pumps, pipes, special material (warmish oxygenated seawater eats most materials other than expensive ones), scaling, fouling etc are all process dependant.
How much it can be reduced by is affected by flow rate of air and water - very difficult to compare the two.
Not sure what you meant by T approach - do you mean delta T?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water cooling HE
RE: Water cooling HE
je suis charlie
RE: Water cooling HE
srfish (Chemical)
6 Oct 16 15:03
LittleInch mentions the requirement of special material required for the HX. Carbon steel is not good for sea water service. The best alloy is 90/10 copper-nickel. Stainless steels are seldom used.
High alloy stainless grades (super-ferritic, super-austenitic, asnd super-duplex) are commonly used in seawater HX, along with Ti gr2. People only use 90/10 when they have no concern about erosion (requires low flow velocities) and they don't mind Cu in the discharge water.
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P.E. Metallurgy, Plymouth Tube