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The Rad Sandwich - Page 2

post #11 of 22
i´m hungry, whens this sandwich finally done?! Oo
post #12 of 22
Thread Starter 
actually, I was thinking about running dual loops,
the "front" loop will be single CPU and the rear one on gpu
im thinking the cpu wont really push the air temp up so much
post #13 of 22
Thread necromancy, ho!

So if I were trying to cool both a CPU and GPU, how would I go about arranging the loop using a rad sandwich concept? Would I use dual loops like usrebmot suggests, or arrange it in series with the CPU before GPU, since the CPU puts out less heat? The rads in question will be SR1s sandwiching San Ace Silents, Gentle Typhoons, or Noiseblocker Multiframes (whichever I find is the quietest while still offering acceptable cooling).
    
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post #14 of 22
Logically it makes no sense. The the heat that dissipates from the first rad will be discharged into the second rad and you will not see the full benefit of have 2x rads, but more along the lines of 1.2 rads......
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post #15 of 22
It really isn't worth it. More money, very little to no gain. As far as where you put the rad in the loop; it doesn't matter. Just set it up in whatever uses the least tubing or looks the best, depending on personal preferences.
    
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post #16 of 22
Actually Ace, the original idea I had in mind was having them in parallel, with air being pulled through the [cooler] CPU 240 rad and into the [warmer] GPU 240 rad. The rad sandwich idea attracts me because it would save a ton of space (kind of important for mITX rigs). Assuming two 55mm thick rads and 55-60mm between them for fans and shrouds, that's a pretty compact package compared to finding two appropriately-sized surfaces.
    
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post #17 of 22
Quote:
Originally Posted by BBEG View Post

Actually Ace, the original idea I had in mind was having them in parallel, with air being pulled through the [cooler] CPU 240 rad and into the [warmer] GPU 240 rad. The rad sandwich idea attracts me because it would save a ton of space (kind of important for mITX rigs). Assuming two 55mm thick rads and 55-60mm between them for fans and shrouds, that's a pretty compact package compared to finding two appropriately-sized surfaces.

Yea but its illogical and a waste of resources. You will be reducing your maximum tdp curve significantly. You can do it if you have them laying around, but do not buy them just to sandwich fail them.

There is no such thing as a "cooler" rad. The temperature of the water is at equilibrium throughout the entire loop.
Edited by Acefire - 12/17/11 at 11:08pm
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post #18 of 22
@BBEG, what are you trying to cool? The chances are that you will be able to do so with a single rad of the size that you are thinking of stacking. Stacking rads is not very efficient, as has been pointed out before, and you will almost always be better off with a single rad.

Here are the results from Skinnee's test:

triples-v2_heatdiss-5dT.jpg

As you can see, the stacked MCR320 does worse than the single MCR320 all the way up to ~1800RPM, then starts to get slowly better, however if you are going to be running those fan speeds there are much better options (GTX360). Also it would seem that you are aiming for quiet, and having to run over 1800RPM just to equal the performance of a single rad doesn't sound like it fits with your goals.

Quote:
Originally Posted by Acefire View Post

There is no such thing as a "cooler" rad. The temperature of the water is at equilibrium throughout the entire loop.

Incorrect.

True, the loop achieves equilibrium when the load and ambient are steady for the required amount of time, however this means that the temperature at each point remains stable, not that the temperature at each point is the same.

If every point in the loop was at the same temperature then it would not be possible for the water to absorb, transfer and emit heat. The water changes temperature as it absorbs heat from the CPU / GPU (increase in temp) and also as it emits heat in the rad (decreases temp).

However what is important is the amount of change in temperature; it is very small. It takes roughly 260W of heat to raise water at 1GPM by 1°C. Even a large loop which is dealing with 1000W would see a maximum temperature difference of <4°C. So whilst all the components in the loop are at a similar temperature, they are not at the same temperature.
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post #19 of 22
If you don't care about noise, why would you run gentle typhoons?
 
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post #20 of 22
Heh, nice necropost but I wouldn't be looking unless I was interested in this too. I am sorta curious exactly how much cooling performance would be lost. I modded my Antec300 to accept a H100 internally mounted on the front, and my GPU uses another 120mm radiator on the back. I figured someday in the future when I goto SLI GTX580's, the 2nd GTX580 will either be aircooled or setup with stacked radiators. I guess buying a new case would be an option too. smile.gif
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