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A few words about pumps and flow rate. - Page 7

post #61 of 74
No please!
One clogg up in the loop and the pressure build up will either burn out the pump or rupture an oring both disastrous!
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post #62 of 74
Hey ive got another post that noone has replied to, but I figured this thread was a good place to ask. I was thinking about having parallel paths for the cpu, each gpu, and one for the vrm ram and lsi plx chips on my mobo. My thought is that with the coolant temperature being the same going into each main component that my performance would be more balanced and allow for all of the components to be overclocked more evenly or is this thought process wrong? I realize that overall the same amount of heat is being drawn into the coolant and therefore extra heat would not be expelled from the radiator. So overall its the same performance but with the same temperature at the inlet of each block. Im simply worried about the overclocking capability of each component if it were run in series.

Also would anyone mind confirming or correcting my assumptions for tubing ans nozzle diameter changes thriughout a loop? If I have a single 1" discharge from my iwaki pump with a discharge pressure of 36psi going to a several different sized lines 1/4 lines and then recombining prior to the radiator to three 1/4 inlets through the rad then a single 1/4 inlet to the res and then back to 1" for the pump suction. Please correct if needed but with the changes in diameter it should increase or decrease pressure and velocity of the fluid allowing the fluid to flow faster and therefore the same amount of mass will still flow. Although this resistance to flow will determine the volumetric flow rate I believe even with this pressure a iwaki or possibly two should be able to handle it correct? And with different flow paths of different restriction, is it possible that the higher restriction path would recieve relatively no flow without a pump directly behind it?
post #63 of 74
Quote:
Originally Posted by dctravis View Post

Hey ive got another post that noone has replied to, but I figured this thread was a good place to ask. I was thinking about having parallel paths for the cpu, each gpu, and one for the vrm ram and lsi plx chips on my mobo. My thought is that with the coolant temperature being the same going into each main component that my performance would be more balanced and allow for all of the components to be overclocked more evenly or is this thought process wrong? I realize that overall the same amount of heat is being drawn into the coolant and therefore extra heat would not be expelled from the radiator. So overall its the same performance but with the same temperature at the inlet of each block. Im simply worried about the overclocking capability of each component if it were run in series.

Also would anyone mind confirming or correcting my assumptions for tubing ans nozzle diameter changes thriughout a loop? If I have a single 1" discharge from my iwaki pump with a discharge pressure of 36psi going to a several different sized lines 1/4 lines and then recombining prior to the radiator to three 1/4 inlets through the rad then a single 1/4 inlet to the res and then back to 1" for the pump suction. Please correct if needed but with the changes in diameter it should increase or decrease pressure and velocity of the fluid allowing the fluid to flow faster and therefore the same amount of mass will still flow. Although this resistance to flow will determine the volumetric flow rate I believe even with this pressure a iwaki or possibly two should be able to handle it correct? And with different flow paths of different restriction, is it possible that the higher restriction path would recieve relatively no flow without a pump directly behind it?

No, parallel for water temperature is not of value. With a good flow rate, the temperature differential for something like 200W of heat which is more than even a highly overclocked hexacore is less than .5C. Most loops don't see more than one degree differential across the loop. It does depend on flow rate, but here is one of my radiator tests where I measured water in and out.

mcr320-qp-th1.png

What could be of value is to do series for some of the luxury items. The trouble with parallel is, a huge lack of data (pressure drop) on many or most parts. Without that information, it is hard to know what will happen. If restriction is significantly unbalanced the high restriction loop may only get a very small portion of the flow. That might be ok, but it may not be what you want. I would always keep the CPU block in series, parallel is ok on like blocks such as GPUs, but hard to guess on other stuff. It certainly can be a valuable tool to emphasize flow rate on the CPU, but without pressure drop on everything, I wouldn't recommend it.

Don't worry to much about tubing size. it has some restriction but very low in the 3/8"+ sizes. No problem to mix and match different sizes in the same loop. Use whatever size you like the looks of best.
    
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post #64 of 74
Just out of curiosity...

I have been wanting, for a long time, to build a machine that is water cooled but has all the H2O equipment (rads/pumps) located in another room or even on the lower floor of the house. The reasoning would be that I could use essentially any number of radiators with as powerful of fans as I wish, yet not have to worry about localized space constraints nor noise levels (think: 3-4x Phobya G-Changer 1080 rads with 54-72 120x38mm 3600rpm 180cfm+/25mmH2O+ fans in push-pull with 20-30mm shrouds) and be able to achieve what I would consider the absolute ideal of above-ambient water cooling.
Let's say that such an endeavor would require 20ft of piping/tubing for each direction of travel. Obviously, something like an Iwaki RD-30 or two (in series) would be a far better choice than 4, 5, or more DDC/D5 pumps.

My question would be, would there be any benefit to using, say, 1"ID PVC piping over 1/2"ID Copper Piping for the runs between "the rad room" and the PC itself?
   
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post #65 of 74
Yes, while restriction in tubing is low enough in a typical system, if you start running 30' worth, I would go larger than 1/2".

10' of 1/2" ID is about a .3psi drop at 1 gpm. So 20' is about equivalent to a lower restriction cpu block like the XSPC Raystorm.

I have heard of other people doing just that. One guy used an RD-30 and larger 5/8" ID tubing.

The other potential concern is lift. If you have to lift to a second story the pump need to have at least enough head to overcome that initial lift amount. Once the loop is filled it cancels itself out, but something to consider in those remote rad type builds.
    
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post #66 of 74
Thanks a lot for all the info guys. I just wanted to confirm or correct any of my thoughts regarding my future build. Depending upon my budget when I start the loop after buying all the pc components I might do separate parallel loops with throttling valves at the outlet of each component to ensure sufficirnt flow through each or if im low in funds left in my budget then I will do 1 or 2 loops each with their own pumps.
post #67 of 74
Thread Starter 
Quote:
Originally Posted by dctravis View Post

Thanks a lot for all the info guys. I just wanted to confirm or correct any of my thoughts regarding my future build. Depending upon my budget when I start the loop after buying all the pc components I might do separate parallel loops with throttling valves at the outlet of each component to ensure sufficirnt flow through each or if im low in funds left in my budget then I will do 1 or 2 loops each with their own pumps.

1 loop, no valves, you want the flow to be as unrestricted as possible.
 
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post #68 of 74
Quote:
Originally Posted by YowZ View Post

1 loop, no valves, you want the flow to be as unrestricted as possible.
^^ This. Less tubing also!

The bigger the difference in the water temperature the more efficient are the rads in getting the heat out.
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post #69 of 74
Quote:
Originally Posted by dctravis View Post

Thanks a lot for all the info guys. I just wanted to confirm or correct any of my thoughts regarding my future build. Depending upon my budget when I start the loop after buying all the pc components I might do separate parallel loops with throttling valves at the outlet of each component to ensure sufficirnt flow through each or if im low in funds left in my budget then I will do 1 or 2 loops each with their own pumps.

One loop is ALWAYS more efficient than dual loops and here is why:

Imagine the first loop has a 120.2 rad on your CPU. Your second loop has an other 120.2 as well on the two GPU's. So you want to encode a video and you max out your CPU. You want all the cooling power you can use. But the only cooling power you get is from that 120.2 rad on it's loop. Your CPU would love to use that other 120.2 rad but that one is sitting almost useless in your idling GPU loop.

You rarely, almost never max out both your CPU and GPU's at the same time. So in a dual loop, you basically always end up with one set of rads maxed out while the other set of rads is useless. If you have a single loop, all your rads can be used where the cooling is needed, when and where they are needed.

If you think your loop is too restrictive, then add an other pump to it. Splitting your loop into separate loops will only decrease your cooling power.
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post #70 of 74
This is a necro I know but this thread is so much win to let it die!
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