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finned tube in a tank of water

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PaulLag

PaulLag

Mechanical
Joined
Jul 26, 2013
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Hi

Hope you are fine and safe.

Please, I am dealing with following problem, and I’d kindly need some pieces of advice.

I have a finned tube that is inserted in a tank full of water.
The purpose of this finned tube is to cool the water of the tank
Into this finned tube passes refrigerant at a lower temperature than water.
My problem is that I can’t find the right correlation in order to set the governing equation, with the aim to know how much the water is cooled.
My second doubt is also if considering this heat transfer natural or forced, since water is standing still in the tank – the same tank is emptied only when temperature is obtained -

I would be extremely grateful if you could recommend me some reference literature, or, in the best case, an example of calculation

Thanks in advance

Stay Safe !
 
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Try looking up finned heat exchanger calculation / design

It can be quite complex and in a still bath of water your only circulation mechanism is convection of the water in the bath, which will be quite slow.

So matching the coolant temperature to the pipe size to the size of the fins will be an interesting balance.

You need to avoid freezing the water in the fins clearly.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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For this batch cooling operation by natural convection, the appropriate equation to use would most likely be eqn 11-35 on page 11-18 in the chapter on heat transfer equipment design in Perry Chem Engg Handbook - 7th edn. You'd probably be not far off the mark if you used the average value of U (between initial and final values). See elsewhere in this same book to get a value for ho for this fin tube assembly.
 
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If this is an open tank, can you put in a mixer? That would cut back on your cooling time.
 
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