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Unread 07-29-2004, 09:07 PM   #1
Etacovda
Cooling Savant
 
Join Date: Feb 2004
Location: Dunedin NZ
Posts: 735
Default Just another post....

Quote:
I've found that its not about water flow or hose size or any of those marketable things.

I'm running part of my aquarius II system (the block and rad) that uses the small hose and I have a new pump/water container.

As I found with the aquarius II system the art in getting it to work was to keep the ambient temp of the water in the reservior as low as possible. The rest of the system wasn't important.

You can work it out.

Joules = watts x seconds.

So we have a CPU thats using max 89 watts (P4 3.0C) which gives 89 joules per sec (about 320k/hour)

it takes 1 kilo-calorie (4200 joules approx) to heat 1 litre of water 1 deg C.

So you can work out how long it will take a P4 3.0C to heat up a litre of water 1 deg.

The important thing to note is that its likely that the surface area of 1 litre of water will radiate heat faster than the CPU would be able to heat it up - so it will probably stay at room (ambient) temp.

Now the problem becomes that of storing a litre of water in your machine. It takes up 1000 cu.cm of space.

Using a rad means you can increase the surface area of the water - so you can use less water. Or if you are not using a rad - you just need to make sure that their is sufficient airflow over the reservoir so that the ambient temp does not rise.

The flow rate of the water is not really important - so long as the water mixes in the reservoir properly - it wont rise above ambient. Remember that if you keep your reservoir inside the case the ambient case temp will often be much higher than outside the case.

Another way of puttin it would be to say - so long as the reservoir of water can radiate heat faster than the cpu can heat it up - the system will stay cool.
An unnamed individual, trying to tell a newbie what he needs to do with his watercooling system.. 'just add more water!'

Worst part is, its an overclockers forum... and this member has been around for quite some time, I think.

Pretty good example of misconception, thought you guys might want to have a chuckle at it; a good example of whats been floating around recently?

edit:: the new pump/watercontainer he is talking about is a mitron POS 400lph, 0.6m head 800ml(ish) pump/res combo.
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