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Uncle`BuZZ · 10-02-2004, 03:52 PM

Hello boys (and girls) !

I am disappointed to see partial results in most of tests I can find on the net, even on overclockers.com

What I mean is that results should be sufficient to simulate any situation to estimate reality.

In this way, what we need is some curves like :

C/W vs flow for rad and waterblocks
pressure drop vs flow for all stuffs

with this 2 curves, we can determine flow in a system, C/W for the given flow, and finally Delta T between CPU and water if you are able to determinate the power of heating from your CPU. Do the same for radiators and you can estimate Delta T between CPU and air, which isn't very accurate, but gives an estimation which is useful to compare with other simulations to determinate the best assembly or component.

pressure drop vs flow is given by manufacturers with a good precision for most pumps

C/W vs flow is given on very high level websites only
Some other good websites give Delta T between CPU and water vs flow, which depends on the power of the CPU, so not really useful. All others gives some useless data like temp from their CPU...

These very high level websites give only a pressure drop for one flow, often 1 GPM, which isn't sufficient as real pressure drop vs flow curve isn't of h=K*Q² type, but h=K1*Q²+K2*Q which need at least 2 points (plus origin) to identify K1 and K2, and more to be more accurate.

Maybe it seems useless for you if you think only high flow systems are powerful and high or moderate power pumps are necessary, but in Europe we are interested by another way (not all, we are divided into 2 tendencies) : small pumps and low flow. In this perspective, our optimisation is focus on taking just the necessary.

On this way, simulating things is useful to determine which pump is suffcient, which diameter of pipe is sufficient (since bigger are always better for performances, but difference between 1/2" and 1/4" ID is not signifiant with low flow) etc.

So I wonder if some websites are already doing this, and why others aren't doing this to give full results ?

Sorry for my poor english (like most of frenchies, shame on us), hope it's understandable.

10-02-2004, 03:52 PM	#1
Uncle`BuZZ Cooling Neophyte Join Date: Oct 2004 Location: France Posts: 28	full test Hello boys (and girls) ! I am disappointed to see partial results in most of tests I can find on the net, even on overclockers.com What I mean is that results should be sufficient to simulate any situation to estimate reality. In this way, what we need is some curves like : C/W vs flow for rad and waterblocks pressure drop vs flow for all stuffs with this 2 curves, we can determine flow in a system, C/W for the given flow, and finally Delta T between CPU and water if you are able to determinate the power of heating from your CPU. Do the same for radiators and you can estimate Delta T between CPU and air, which isn't very accurate, but gives an estimation which is useful to compare with other simulations to determinate the best assembly or component. pressure drop vs flow is given by manufacturers with a good precision for most pumps C/W vs flow is given on very high level websites only Some other good websites give Delta T between CPU and water vs flow, which depends on the power of the CPU, so not really useful. All others gives some useless data like temp from their CPU... These very high level websites give only a pressure drop for one flow, often 1 GPM, which isn't sufficient as real pressure drop vs flow curve isn't of h=KQ² type, but h=K1Q²+K2*Q which need at least 2 points (plus origin) to identify K1 and K2, and more to be more accurate. Maybe it seems useless for you if you think only high flow systems are powerful and high or moderate power pumps are necessary, but in Europe we are interested by another way (not all, we are divided into 2 tendencies) : small pumps and low flow. In this perspective, our optimisation is focus on taking just the necessary. On this way, simulating things is useful to determine which pump is suffcient, which diameter of pipe is sufficient (since bigger are always better for performances, but difference between 1/2" and 1/4" ID is not signifiant with low flow) etc. So I wonder if some websites are already doing this, and why others aren't doing this to give full results ? Sorry for my poor english (like most of frenchies, shame on us), hope it's understandable.