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Pump-Pump-Rad or Pump-Rad-Pump setup? - Page 3

post #21 of 24
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Blimey, so much information to take on... Thanks all for their contribution! All will get REP+ smile.gif

Quote:
Originally Posted by givmedew View Post


Regardless... the original question was:

"As above, what will be better for redundancy and flow?"

It does not matter... install it in the way that looks the best, takes up the least amount of room, uses the least amount of fittings, and the shortest length of tubing.
Just had another thought, I should have enough room to fit a dual top and run pumps together in serial, but that will require a bit more costly modifications to the loop, after which I will end up with a spare EK CSQ DDC top and MCP35X Series Heat Sink... I will reconsider that vs just connecting the pumps with a bit of a tube... SkineeLabs made some tests and it looked like 2 pumps with 2 seperate tops in a series performed slightly better than with a dual top...
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Viggen Blue
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post #22 of 24
Quote:
SkineeLabs made some tests and it looked like 2 pumps with 2 seperate tops in a series performed slightly better than with a dual top...
Take a look at the angles the water has to go through and the diameter of the channels inside those dual tops and it makes sense. Most dual tops take 0-2 right-angle 90 degrees for the inlet, 1-3 right-angle 90 degrees between pumps, and 0-2 right-angle 90 degrees at the outlet (depending on top design). That said, the restriction isn't major, and many people prefer the clean look of the dual top.
post #23 of 24
You should have res to pump order after that it doesnt matter.In 99% of watercooling systems there is no "optimal" component ordering, EXCEPT that which minimizes tight bends and overall tubing length. This is not always true as there can be a significant difference (read: measurable) when dealing with extremely high heat loads, like those found in systems in which one or more components are actively cooled by a TEC. Because of water's high heat capacity, there is very little change in water temperature due to the heat dump from components that may be considered "parasitic" to the loop's most efficient operating conditions. What do I mean by this? In your case, this only really applies to the pump.

Example:

Specific heat of water (c) = 4.186 J/gram-°C

By definition 1 Joule (unit of energy) = 1 Watt-second (unit of power)

therefore, c = 4.186 W-sec/gram-°C

Meaning, if you pump "dumped" a modest 15W of heat into your loop:

Q = cm(ΔT) where Q is the heat added (15W), c is the specific energy of the material "receiving" the heat energy (water), m is the mass of the material, and delta T is the rise in temperature of the material.

Since this would ultimately depend on flow rate (to be given as g/sec, L/hr, gal/min or whatever other units you desire) we are going to simplify our example by assuming your flow rate is 2L/min:

(2L/min)(1 min/60 sec)(1000 g/1L) = ~42 g/sec (1L water = 1000 g by definition)

Q = cm(ΔT) => 15W = (42 g/sec)(4.186 W-sec/g-°C)(ΔT) -> ΔT = 0.08 °C

As you can see, certainly not a lot of temperature rise due to the pump alone. So assuming the water temperature entering the pump was 25°C exactly, this would mean that the outlet temperature from the pump would be 25.08°C. If the CPU (or any other block) was located such that the outlet of the pump directly feed it then the supply temperatures would be 25.08°C! (assuming that your tubing was a perfect insulator)

Try repeating this calculation with higher flow rates (3L/min, 4L/min, etc.) and you will see that in any case there is not much to be gained by sending the water from the pump through the radiator before any cooling block/device. In fact, due to the extremely small water temperature increase from to the pump I'm no so sure you would see ANY difference in radiator outlet temperature (a passive heatsink's ability to reject heat is directly proportional to the difference in temperature between the medium being cooled and the medium providing the cooling, in this case air at ambient).

I hope I've at least partially answer your question. If not, here's the bottom line: I believe you will find that there is little to no performance difference to be achieve by ordering components in your loop. Instead, work to minimize flow resistance (smooth tubing bends and as little tubing used as possible). Any optimizations here will allow for maximum flow
post #24 of 24
Quote:
Originally Posted by chrisf4lc0n View Post

Blimey, so much information to take on... Thanks all for their contribution! All will get REP+ smile.gif

Quote:
Originally Posted by givmedew View Post


Regardless... the original question was:

"As above, what will be better for redundancy and flow?"

It does not matter... install it in the way that looks the best, takes up the least amount of room, uses the least amount of fittings, and the shortest length of tubing.
Just had another thought, I should have enough room to fit a dual top and run pumps together in serial, but that will require a bit more costly modifications to the loop, after which I will end up with a spare EK CSQ DDC top and MCP35X Series Heat Sink... I will reconsider that vs just connecting the pumps with a bit of a tube... SkineeLabs made some tests and it looked like 2 pumps with 2 seperate tops in a series performed slightly better than with a dual top...

I should have included what was the cheapest... it is the reason I said the least amount of fittings... again the differences are going to be so tiny. The least amount of tubing is to keep it looking clean. A single DDC or D5 type pump is more than enough to keep the flow above 1GPM. After 1GPM performance will still increase but it won't be substantial and eventually heat dump from the pumps starts to become a factor in the diminishing returns. Tube length isn't such a big deal that you need to avoid a few extra inches or a foot or two. So yes I could totally see 2 separate high end pup tops outperforming one double pump top especially because the tinniest changes in those pump tops can affect the performance.

Anyways I wouldn't go spending a ton of extra money for no reason.
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