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[Network World] Swedish data center saves $1 million a year using seawater for cooling - Page 4

post #31 of 37
Quote:
Originally Posted by Jarhead View Post

I think there is a member here that hooked his PC's liquid cooling setup to his swimming pool. BTW, a basement swimming pool is a great way to do geothermal climate control in even a very large house because that water will basically be the same temperature year around. Not practical for most, but something to think about if you ever find yourself in the situation of building a brand new house.

The cost of building the level and then maintaining climate control to keep the house from molding over is too expensive for me tongue.gif
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post #32 of 37
Quote:
Originally Posted by Bit_reaper View Post

I don't think its anything that fancy. The pipes are probably plastic and the heat exchanger copper with a sacrificial anode.

There is nothing "fancy" about a titanium heat exchanger, I have bought several for various large chemical plants which used seawater cooling. It works out cheaper in the long run as there is lower maintenance requirements and costs.

Edit: Cathodic protection on this type of equipment, however, is fancy. We do it on some of our large acid coolers where the temperature and corrosive properties of the acid makes a non-corrosive material selection either impossible or cost prohibitive. It requires a lot of calculations, preventative maintenance and a large DC power supply to drive it.
Edited by GingerJohn - 5/19/13 at 9:37am
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post #33 of 37
Quote:
Originally Posted by GingerJohn View Post

There is nothing "fancy" about a titanium heat exchanger ...

I'd hate to see the cost for something like that. I mean a small one is one thing, but something sufficient in size to cool several tons worth of heat energy would be massive and expensive.
post #34 of 37
Quote:
Originally Posted by 47 Knucklehead View Post

I'd hate to see the cost for something like that. I mean a small one is one thing, but something sufficient in size to cool several tons worth of heat energy would be massive and expensive.

Not as bad as you would think.

For plate and frame the plates are generally very thin - in the order of 3-4mm. For shell and tube you would put the seawater on the tube side - saves having to make the shell out of titanium.

The last titanium plate and frame exchanger I bought was fairly large, it ran in the region of $50-60k
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post #35 of 37
Quote:
Originally Posted by GingerJohn View Post

There is nothing "fancy" about a titanium heat exchanger, I have bought several for various large chemical plants which used seawater cooling. It works out cheaper in the long run as there is lower maintenance requirements and costs.

Edit: Cathodic protection on this type of equipment, however, is fancy. We do it on some of our large acid coolers where the temperature and corrosive properties of the acid makes a non-corrosive material selection either impossible or cost prohibitive. It requires a lot of calculations, preventative maintenance and a large DC power supply to drive it.

You do know you can have passive cathodic protection. All it takes is to have is a lower negative electrochemical potential. Like when you strap a block of zinc to your outboard motor.
    
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post #36 of 37
Quote:
Originally Posted by Bit_reaper View Post

I don't think its anything that fancy. The pipes are probably plastic and the heat exchanger copper with a sacrificial anode.
Why does everyone think there is only one type of corrosion?

A sacrificial anode wont do jack to protect copper from seawater, because galvanic corrosion isn't what is happening. Perhaps with some sort of active setup, you will reduce corrosion overall, but... no.

I am in charge of the cooling system at work, it keeps 32 plastic injection molding presses from overheating, with capacity for double that if we run the backup unit at the same time.

Our corrosion problems are entirely unrelated to any sort of electrolytic process, and they are kept in check (very well I might add) by using appropriate corrosion inhibitors and keeping the PH as close to 8.5 as I can. We run aluminum, steel, brass, and PVC in the system, and it is a nightmare when things get out of whack.
Edited by Masta Squidge - 5/19/13 at 10:09am
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post #37 of 37
Quote:
Originally Posted by lacrossewacker View Post

Does Salt water have a higher heat capacity than fresh water?  

That shouldn't matter since it starts cool and there's a large mass of it smile.gif

Energy = mass * heat capacity * change in temperature

So even if heat capacity is low you can overcome that by having lots of whatever you use for cooling.
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