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How hot does your Res water get? - Page 3

post #21 of 67
Quote:
Originally Posted by prava View Post
You have no idea what you are talking about. The max temperature difference you will see in probably any watercooling loop would be around 3 - 3.5ºC, but not more (unless you have VERY extreme loop, that is).

So, please don't spread false information. Temperature variation within a loop is very small; in a normal basis we are talking about less than 1.5ºC comparing the hottest and coldest point of the loop.
Excuse me armchair scientist, how about instead of being a snobby ass with clearly no technical knowledge you listen to a guy who has active temperature monitoring on his loop and clearly knows his deltas (stallion). Also a company who bases their results on empirical date (skinee labs) states that loops can get up to a 15c delta if not optimized. Plus if there is a 1.5c temp difference between water going into your rad and then out, then what the hell if your rad doing. Your radiator can dissipate several hundred watts (energy over unit time derp), which is clearly going to affect the water in more than a 1.5c way... will find links to skinnee labs testing to prove you wrong if you'd like

Tldr: you're wrong, let's see empirical data from testing that proves you right, because actual data disagrees with your armchair scientistry
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post #22 of 67
15°C delta with 1 liter of water is Q=m*c*dT=63kJ of heat! This is absurd.

I've already calculated this in some other thread so here we go again:

For example one FC waterblock that heats up water by 1°C. There's about 50mL of water in one block, water flow is 1GPM (240L/h = 0.067L/s) That means water travels through block for about 0.74s. This means the water must heat up for 1°C in 0.74s.

Q = m*c*dT = 0.05kg * 4200J/kgK * 1K = 210J

P = Q / t = 210J / 0.74s = 283 J/s = 283W!

Even three very hot cards and one very hot CPU cannot reach 5°C delta between coldest and hottest point of the loop.
Edited by EK_tiborrr - 10/17/11 at 8:52am
    
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post #23 of 67
Well, if you look at the thermal results on the test of an average rad (Swiftech MCR320) with a 400W heat load at http://skinneelabs.com/swiftech-mcr-320-qp/3/ you can see that the water in/out temp variance of no more than about 2ºC at a low flow rate/low fan speed
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post #24 of 67
my res water heats up..if i set the volts @ 1.52+ and game..it goes up by about 5c ..when using a 125w chip..no change when using 95w chip.Ambient is around 25c..res is 22c (before loading)
 
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post #25 of 67
Quote:
Originally Posted by Nynn View Post
Im just wondering to see hot hot does your res water get.


I took my res temp and it was like 115F. Hot to the touch :X


Is that normal?
No, unless your ambient is 100F+.
post #26 of 67
My water only gets lukewarm. I would do scientific test but my thermometer is stuck at 35
post #27 of 67
Quote:
Originally Posted by EK_tiborrr View Post
15°C delta with 1 liter of water is Q=m*c*dT=63kJ of heat! This is absurd.

I've already calculated this in some other thread so here we go again:

For example one FC waterblock that heats up water by 1°C. There's about 50mL of water in one block, water flow is 1GPM (240L/h = 0.067L/s) That means water travels through block for about 0.74s. This means the water must heat up for 1°C in 0.74s.

Q = m*c*dT = 0.05kg * 4200J/kgK * 1K = 210J

P = Q / t = 210J / 0.74s = 283 J/s = 283W!

Even three very hot cards and one very hot CPU cannot reach 5°C delta between coldest and hottest point of the loop.
Have you seen that stallion guy's build? He has 4 580's and a 990x, which could easily reach a 5C delta... and I'm sure your math is correct with certain assumptions, but why would benchmarking websites call an 'average' cooled system one with a 10c delta and then provide benches of it, even though it does not matter?
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post #28 of 67
Quote:
Originally Posted by kdon View Post
Your radiator can dissipate several hundred watts (energy over unit time derp), which is clearly going to affect the water in more than a 1.5c way.
So I'm more of an office chair engineer, formerly a thermodynamisist actually, and I disagree with you.

The water is moving. Always remember that.

Q = m * cp * dT

To change between Q being energy in J to power in W we need to add a time term to the other side. Therefore m becomes the mass flow rate (g/s).

Lets see how much energy it takes to raise water at 1GPM by 1°C:

dT = 1°C
Cp = 4.185J/g/K
m = 1 * 3.785 (gal > l) / 60 (min to sec) =63g/s (assuming 1l = 1kg)

Q = 63 * 4.185 * 1
Q = 264W



It takes ~260W to raise water moving a 1GPM by 1°C. That also means that for a rad to disperse ~260W the dT between inlet and outlet is only going to be 1°C.

Incidentally it is a linear relationship. If you double the mass flow you half the temp rise, double the heat dump double the temp rise. Use the approximation of 260W / °C @ 1GPM to work out the temp change in your loop if you want, it will be small.
Edited by GingerJohn - 10/17/11 at 9:55am
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post #29 of 67
Quote:
Originally Posted by n0n44m View Post
it's a 1.5c difference between entering my CPU block and exiting my GPU block

I can imagine it's much more than that with a overclock 1366 cpu and triple SLI setup

This is what I have noticed too. It makes no sense to me, but I am not an expert in the thermal properties of water. For some reason it doesn't seem to heat up much going though the blocks, but at the same it removes a massive amount of heat from the blocks.

Common sense would say that the water would be really hot coming into the radiator and relatively cool coming out, but that is not the case. I've made the observation that I get the best cooling performance by using whatever loop set up that uses the least amount of hose. Even if that means daisy chaining blocks or radiators.
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post #30 of 67
Quote:
Originally Posted by kdon View Post
Have you seen that stallion guy's build? He has 4 580's and a 990x, which could easily reach a 5C delta... and I'm sure your math is correct with certain assumptions, but why would benchmarking websites call an 'average' cooled system one with a 10c delta and then provide benches of it, even though it does not matter?
Because water temperature will directly affect your CPU/GPU/Ram/Chipset temps, whatever you're cooling. The lower your delta, the lower your core temperatures by nearly a direct ratio. If you can drop your water temp by 1c, that will also drop your core temperature by roughly the same amount.

Before you start flaming people about their "false" information, you should check your own first.
 
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