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Two reservoirs in one loop?

K

kqt2ktval

n00b
Joined
Mar 29, 2006
Messages
10
Does anyone recommend or have two reservoirs in one loop.

My current setup is as follows.

dandgerden D5
Maze 4 GPU 6600 GT
Swiftech MCW6002 cooling Athlon 64X2 3800
Dual radiator.
Tank-O-Matic reservoir
another PIPE reservoir.

Reservoir --> PUMP--> Radiator--> CPU--- GPU--> back to original reservoir.

I want to add a second Reservoir to the loop. ( This is strictly for looks only ). However I don't want it to interfere with the flow by adding too much restriction. Where would be the best place to add this second Reservoir?
 
Order of components does not matter... You can place it wherever you like.

I wouldn't worry about flow resistance. Flow-rate isn't all that important really.
 
I'm thinking about the flowing loop. Please give me your opinion. I heard the order of the loop is best with the reservoir before the pump.
untitled.bmp



I have problems adding image. I have a lay out of what it will look like.
 
No matter the reason. If you want 2, go for it. Just that it is 2 more than some.;)

How about in series? Or you could tee the inlets/outlets, depending on the effect desired.
 
I really need to ask, why the hell would you add a second reservoir for looks?
Click to expand...

I have two pvc style reservoirs. I have one on the back of the case and one on the top of the case. It's not worth much if I try to sell it,. so I thought I will just incorporate it. I'm not an extreme overclocking. Went to water cooling because of the WOW factor and silence. It will not look nice if I put them in series as least not running the tubbing. As stated, I do have a diagram, but I can't seem to add the picture in. The file is on my desktop. Any idea on how to accomplish this?

The basic layouot will be this. Pipe reservoir on top of case (External), and pipe reservoir on back on case (External). Radiator on top of case (Internal). GPU, CPU waterblock and pump inside of case.

Reservoir (back) --> pump-- radiator ---CPU -- radiator ---GPU --- back to original reservoir.

To obtain the cleaness look, I will have to go Reservoir (back) ---> pump--> RAD---> Reservori (top)---CPU ---> GPU--> back to first reservoir.
 
hmm. Reservoirs are not meant to be under pressure. I *wouldn't* do it, but it would probably work OK. Just make sure your reservoir cap is on tight!
 
No, I haven't done this myself, but 2 reservoirs in a loop should really hurt your flow. How much, I can't say for sure, but think about it this way:

Almost always a loop with a reservoir will look like this:

Pump -> [radiator(s), CPU/GPU/Chipset/any other blocks in some order] -> Reservoir -> Pump (start)

People almost always stick the reservoir right before the pump because (going by logic) it makes it easier for the pump to get water flowing around the loop. Going from the beginning, a pump pushes water through the radiator(s) and block(s) of loop, which are all pretty much closed pathways for water to go around. Water (at least is supposed to) fill up every orifice of each block and radiator, so as water gets pushed through each component, it in turn pushes the water in front of it as well. In turn, while there's almost always only a single point where water is artificially pumped forward, water manages to get through the entire loop.

Now consider a reservoir. In order for it to do its job and bleed a loop, there needs to be some empty space (air) where bubbles can release their air and leave only water flowing through a loop. This means that unlike a block or radiator, a reservoir is an open area. Think of all of the previous loop like a stream flowing into a pond. All the momentum and speed the water had going before is lost. In nature, water can get out by flowing out in another stream going downhill, but in a loop you can have a pump right after it. When a pump pushes water forward with positive pressure, it creates negative pressure behind it that sucks up water with it. Effectively, a reservoir at the end of a loop (right before the "beginning", or pump end) kills a loop's flow, but since the pump can easily suck water from the reservoir to continue sending more water into a loop.

So what's wrong with adding another reservoir at some other point in a loop? Since flow is pretty much killed as it goes through a reservoir, if you have another component after the reservoir, then the pump effectively has to suck the water through that component, instead of sucking it straight from a reservoir. Think of how easy it is to suck water through a straw compared to a thick milkshake. Your pump probably won't last as long, and should flow slower. Even sticking another reservoir right before the pump won't help; in fact, it will likely make it worse. Instead of the pump able to suck through another component, it will have to rely on enough pressure/flow getting water through the components right after it getting water up to the 2nd reservoir next to the pump, then sucking that water up. 2 reservoirs in a row would be pretty much equivalent to flow suicide. I can't give actual numbers to any of these scenarios, but flow does still matter. Yes, it's extreme, but a difference of 0.25gpm to 1.5gpm can easily equal 6*C+ with in loop with a few hundred watts of heat.

I would highly, highly recommend against a second reservoir. If you really, really want to add it to your loop, if you completely fill the one in the middle of the loop, water can have a chance to keep flowing along in the loop, although your reservoir designs can dictate how much of a difference you'd see.

BTW, to host pictures: http://www.imageshack.us
Upload a picture, and they'll give you various VBB codes to use in forums (like [H]). Copy the code which looks something like

[|MG]http://img77.imageshack.us/img77/5987/hardforumtitlewj8.gif[/|MG][/UR|] ( Hotlink for forums (1))
 
ikellensbro said:
Now consider a reservoir. In order for it to do its job and bleed a loop, there needs to be some empty space (air) where bubbles can release their air and leave only water flowing through a loop. This means that unlike a block or radiator, a reservoir is an open area.

...but in another stream going downhill, but in a loop you can have a pump right after it. When a pump pushes water forward with positive pressure, it creates negative pressure behind it that sucks up water with it....

...Since flow is pretty much killed as it goes through a reservoir,
Click to expand...
It may be an "open area", but it is sealed from atmospheric pressure, so the "stream analogy" doesn't work. Are there any rez's that are not sealed? If I "unseal" my T-line (located right after my Iwaki pump, the stream of water gushing out of the top of the T-line would be 2 feet high!

"Effectively, a reservoir at the end of a loop (right before the "beginning", or pump end) kills a loop's flow, but since the pump can easily suck water from the reservoir to continue sending more water into a loop."...Huh?
 
friedchicken said:
Here is my setup.

That's an "interesting" setup on the video cards. You're depending on the restriction of the cards to balance the flow between them aren't you? Which one runs hot?

Nice and neat work though, lotsa bling.
Click to expand...
 
billb said:
friedchicken said:
Here is my setup.

That's an "interesting" setup on the video cards. You're depending on the restriction of the cards to balance the flow between them aren't you? Which one runs hot?

Nice and neat work though, lotsa bling.
Click to expand...
Click to expand...


Bill, the outside card runs at 41-46 degrees under load, and the inside card runs at 56-62 degrees at load. And you are correct about the flow preassure splitting itself between the 2 cards. It appears that flow is a 60/40 split between the 2 cards.

I expected this result and put spacers on the inside card to increase flow capacity- while removing them from the outside card. If anyone has an EK waterblock, they know how the barbs sink into the cover and restrict flow without the spacers.

Even with this change, there is more flow through the outside card. I could normalize flow through the inside/outside card by pushing more water through the loop. But that would mean I need to take out the NB waterblock (it is the current restriction).

Pros/cons weighed out however, I think the temps are fantastic under load with the waterblocks all in the same loop and the QX6700 CPU overclocked. Under the same load testing, my CPU temps floated between 39-49 degrees.

Plus, if you look at how my case is designed, routing the tubing would be a nightmare using the 1/2" between the 2 cards.

In my last variant, I had the waterblocks/SB block on a separate loop then the CPU and NB, but I ended up using about 30" more tubing, and no pump redundancy. Hence the 2 resevoirs.

As for the OP, resevoirs are not very useful once the system is bled properly.
 
Yes, just 1 is enough per loop. 2 or more just add more points of failure without any benefits.

 
Xilikon said:
Barely ?? The main one is fast bleeding ;) this one is enough to make a reservoir useful.

Click to expand...

A properly placed Tline setup is good enough.

My Tline setup that I put in my server bled in under 30 seconds. Just place the T at the VERY top of the loop.
 
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