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Old Oct 22nd 2010, 06:59 AM   #1
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freezing large amount of water ??

hi all
im doing a project and thermodynamics is a major step that i have no experience with it ..say i have a tank that contains about 15K gallon ..so doing a cooling cycle with freon will cost much during time ,, i need a solution with less cost as possible ....

the 2nd problem ..say that i have freezed the water and i have another water tank with same size ..how to apply a heat transfer and is that a good idea

the 3rd problem ..the isolation ..what is the best way .. to prevent heat loss or the surrounding heat

thanks all
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Old Oct 22nd 2010, 07:56 AM   #2
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Use the greatest surface area as possible?

Like pass a tube carrying the cooling substance through the tube which is very long and coiled into the tank. At zero celcius, you remove the tube and maintain the temperature of the surroundings of the tank at 0 C.

Heat transfer? What are you expected to do? Cool the water in the other tank?

Use of double glazed glass perhaps? Air is one of the best heat insulators.
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Old Oct 22nd 2010, 06:55 PM   #3
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first ..thx for your reply

* it's a good idea ..but i think this amount of water will have a huge heat capacity that overalls the surronding tempreture or may reduce the water tempreture a little ...mm maybe i dont know ..just a thought but it needs some calculasion ..but im not good with thermodynamics


* the idea here is that im thinking of using the tempreture of the freezed water to cool another tank to reduce it's freezing cycle ..maybe by a heat exchanger or using some of the 1st tank's water and mix it with the other ..dont know wich is better

* this one is good thank you ..i hope it can be applied for wide surface
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Old Oct 22nd 2010, 07:00 PM   #4
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.. is there any substance that is better than freon in cost (easy to maintain )? or a cooling cycle .. most of the industrial methodes are old theories i hope that they've found some new things
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Old Oct 22nd 2010, 10:54 PM   #5
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1. You are trying to cool the water right? So, it woul dbe good to "reduce the water tempreture a little" or am I missing something...?

2. Okay, this said, you could leave the pipes in 1. to make the water from the other tank flow into the frozen tank now. It already provides a large surface area and the heat transfer will be relatively fast.

3. It's the same idea as thermos. They trap air between two insulating materials (shiny to reduce heat transfer by radiation) and it works

Sorry for the other one, but I don't know of a cooling agent... You could check out on wikipedia:
Chlorofluorocarbon - Wikipedia, the free encyclopedia

But apart from that, maybe you could use liquid nitrogen. It's a very cold substance (-196 C), but I think it would be quite expensive because it is obtained through the distillation of liquid air. And since it is very cold, safety is important.
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Old Oct 23rd 2010, 01:43 PM   #6
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thank u .. this is very interesting
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