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post #12831 of 107031
Quote:
Originally Posted by Philth View Post
You're thinking too much about theoretic ideals and not enough about real-world results.

In large-scale cooling systems (think outside of PCs) this can be true, but think for a second the relative size of your pc loop and then the speed at which your pump is pushing that water. The water is not sitting above your block long enough to absorb enough heat to make a notable difference from when it went into the block to when it came out. The water eventually accumulates heat, but it's gradual as it reaches stability throughout the loop.

This isn't "my theory"; this is generally accepted that the water in your loop reaches an equilibrium, at which point the order in which you place blocks/rads becomes moot.

But, feel free to grab some temperature readings and see for yourself. In fact, it would be good to get hard evidence to clear up the issue for everyone.
You can control the rate of flow correct? So if you slow the rate of flow until the temps change and finding the sweet spot wouldn't his stance make sense? That the Temp at the CPU would be higher than the temp out of the Radiatior? Hypothetically speaking?

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post #12832 of 107031
Maybe if people think of it as all the tiny water particles flowing around, each picking up a tiny bit of heat at blocks then dumping that tiny bit of heat at a rad. Then think of how many millions of those particles there are and how fast they are flowing through the loop.

It's a continuous cycle. Water doesn't just sit in a block until it feels toasty enough to move on, it's like a conveyer belt for heat.
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post #12833 of 107031
I believe it is something around 300W (could be 250 I forget) for every 1 degree of difference. Meaning that if your water passes through your GPU going at full power (let's say they are putting out 300W of heat) then the water that comes out of the block will be merely 1 degree higher than the water going in. The difference in temperature throughout your loop will NEVER vary by more than a couple degrees at most because your radiators dissipate the heat that is being pumped in.
post #12834 of 107031
Quote:
Originally Posted by Philth View Post
You're thinking too much about theoretic ideals and not enough about real-world results.

In large-scale cooling systems (think outside of PCs) this can be true, but think for a second the relative size of your pc loop and then the speed at which your pump is pushing that water. The water is not sitting above your block long enough to absorb enough heat to make a notable difference from when it went into the block to when it came out. The water eventually accumulates heat, but it's gradual as it reaches stability throughout the loop.

This isn't "my theory"; this is generally accepted that the water in your loop reaches an equilibrium, at which point the order in which you place blocks/rads becomes moot.

But, feel free to grab some temperature readings and see for yourself. In fact, it would be good to get hard evidence to clear up the issue for everyone.
While you've only got a CPU in the loop you are correct in saying
Quote:
The water is not sitting above your block long enough to absorb enough heat to make a notable difference from when it went into the block to when it came out.
but once you've got several hundred Watts of heat being absorbed by the water, a notable increase in temperature is seen. For instance, if you load up both of my graphics cards and my CPU, the water coming out of the final block is noticeably warmer.

In a loop like mine, I'm looking for the best possible temperatures for my CPU. This is why my loop is setup in such a way. If I was to run the opposite way around with my pump and GPUs before the CPU, I'd bet that I would see a increase in both idle and load CPU temperatures.


Quote:
Originally Posted by thrasherht View Post
You realize the energy it takes to heat up water? it is a TON which is why water cooling is so effective, it can absorb a ton of heat without heating up.
Same goes for the other way around, it will also release a ton of heat without cooling down.
If you have taken Chem, it would be the specific heat, which is the amount of energy it takes to heat one gram of water, one degree centigrade. That would equal one calorie by the way.

if you look at how much heat it dumped into the loop per second by a video card, and compare that to how much water is passing through the GPU block in that same second, it would take more energy then the GPU is putting out to heat the water that much.
So, what if you happen to have a budget system? One with a low flow pump and multiple waterblocks.

Your statement
Quote:
water cooling is so effective, it can absorb a ton of heat without heating up.
is obviously incorrect. Think about what you are saying there. Heats go to go somewhere, right?

My three water blocks are absorbing upwards of 500 Watt of heat. For the water to be negligibly warmer, you would have to have hugely huge flow rates.


The optimum (For CPU and GPU temp) setup is this:

Res > Pump > Rad > CPU > GPU > Res

Ensures the Res is feeding the pump, the pump is pushing, not sucking and minimum heat from the pump reaches the CPU also.
Edited by Willhemmens - 8/2/11 at 5:13pm
post #12835 of 107031
updated
post #12836 of 107031
There will always be temperature variations between different points in the loop. Saying that after a certain amount of time the placement of rads/blocks becomes moot because the temperature is the same throughout is simply false. The water will always be a bit warmer after a block and a bit cooler after a rad, and placement of these elements in the loop will make a difference. How large of a difference depends on the speed of the water flow and the power output of the computer. Temperature probes for our application may not be sensitive enough to pick up this difference, but there is still a difference there. But in all, you'll likely only see a few tenths of a degree difference due to the speed of the water flow.
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post #12837 of 107031
Quote:
Originally Posted by Kinru View Post
I believe it is something around 300W (could be 250 I forget) for every 1 degree of difference. Meaning that if your water passes through your GPU going at full power (let's say they are putting out 300W of heat) then the water that comes out of the block will be merely 1 degree higher than the water going in. The difference in temperature throughout your loop will NEVER vary by more than a couple degrees at most because your radiators dissipate the heat that is being pumped in.
that depends... and the 300w per 1c is dependent on flow rate.

I know that my res temp rises a whole lot when the computer is under load vs. when it is at idle, far more than one or two degrees difference.
post #12838 of 107031



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post #12839 of 107031
updated
post #12840 of 107031
Good discussion going on in here, its a healthy one! I am sure OP will allow us to give lots of views related to watercooling.
    
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