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How many rads need how many pumps ? - Page 2

post #11 of 18
Quote:
Originally Posted by Owee View Post

Sadly even Delta fans push only about 250 CFM not to mention the noise ! wink.gif


Delta's also have a static pressure of about 38.2mmH2O

When working with radiators static pressure is a LOT more important than CFM. The HIGHEST static pressure you can find on a 120mm X 25mm fan I believe is the Bgears fans which have 3.5mmH2O

It doesn't take a genius to know that 38 is a LOT bigger of a number than 3.5
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post #12 of 18
Thread Starter 
Quote:
Originally Posted by ZytheEKS View Post

Delta's also have a static pressure of about 38.2mmH2O

When working with radiators static pressure is a LOT more important than CFM. The HIGHEST static pressure you can find on a 120mm X 25mm fan I believe is the Bgears fans which have 3.5mmH2O

It doesn't take a genius to know that 38 is a LOT bigger of a number than 3.5

So you mean with Deltas it would make sense (putting the noise part aside) ?
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post #13 of 18
Quote:
Originally Posted by Owee View Post

So you mean with Deltas it would make sense (putting the noise part aside) ?


It might, I've never seen anyone do any testing with it. Not worth it IMO, each delta fan is at least $40. By the time you bought 3 delta fans you are in $120. Then factor in a radiator, you're in $200 for a SINGLE radiator and 3 fans. Price adds up way to fast for it to be practical for anything other than proof of concept testing.


You'd be wise to listen to this guy:
Quote:
Originally Posted by lowfat View Post

I do not believe that would perform well like others have said. You could fit a 3x120mm at the bottom, a 3x120mm up front and a 3x120mm up top easily enough. Radiators aren't very restrictive. A pair of MCP35X or D5-Varios would definitely be more than sufficient.
Although, I would switch from two MCP35x pumps and instead go with the MCP35x2, but that's just me.

Unless you're cooling a 25v TEC chiller or a server rack you would NEVER need anything more than what lowfat listed.
Edited by ZytheEKS - 5/29/13 at 1:45am
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post #14 of 18
Quote:
Originally Posted by ZytheEKS View Post

The majority of modern radiators use a dual pass U flow chambers. This means all those chambers you see are NOT flowing independent of each other. Usually the combined area of the inside of the chambers flowing in a single direction is a LOT larger than the area of the G1/4 barb, with very little obstruction in the chambers path. This means the resistance they add to your loop will be negligible. The only thing you REALLY need to factor in to a large extent is the amount of waterblocks (as they are usually VERY restrictive) and the combined length of the tubing you're using.



On a side note, your idea WON'T work. You simply wouldn't have enough static pressure with standard 120x25mm fans. I'm really not a fan of these tests (no puns intended) because they fail to list the static pressure or model of the fans their using, and also fails to list the fin thickness or fins per inch of the radiators used, but it is a good representation of what YOU are planning to do. Simply put, under normal conditions your idea wont work.

Huh?

"All of the tests were done with said Magicool Slim rads, Nanoxia FX-1250, a 300W heater and a MCP355" Top of the page.

Magicool slim 360 ... 30mm and 14FPI ... http://www.magicool.biz/images/products/radiators/Radiator%20360/MC-RADI360_TI.pdf
Nanoxia FX-1250 ... Static Pressure (mm H콿) 1,53
http://www.aerocooler.com/product_info.php?products_id=1459
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post #15 of 18
Thread Starter 
What if there was more spacing between a rad+fans - something shroud-like ? Aren't shrouds supposed to improve air flow in such cases ?
Edited by Owee - 5/29/13 at 10:42am
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post #16 of 18
Here's a test for you to see why stacking radiators won't work.

Put a ping pong ball on top of something.

Stand 5 feet away and blow until it drops.

Now stand 10 feet away and blow until it drops. Notice it will never drop.

Now take a 10ft long piece of hose or something, and blow through it.

Notice the ball still won't drop.

Now stand 1 ft away and blow through some corrogated cardboard, which is closer to a radiator than an empty hose.

Now imagine how much air you would need to blow into the first radiator for it to make it through more than one or two.

You would need to have a shroud for each fan BUILT in to the radiators, and some way to make it air tight as well. What I mean by built in I mean the shroud would have to line up eprfectly with the fans, and be built into the fins of the radiator. That's in addition to having ungodly fans.

It's simply impossible, if you don't believe us go ahead and try. You'd get more of a benefit by just passively cooling the radiators when you are using that many.
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post #17 of 18
Quote:
Originally Posted by Jakusonfire View Post

Huh?

"All of the tests were done with said Magicool Slim rads, Nanoxia FX-1250, a 300W heater and a MCP355" Top of the page.

Magicool slim 360 ... 30mm and 14FPI ... http://www.magicool.biz/images/products/radiators/Radiator%20360/MC-RADI360_TI.pdf
Nanoxia FX-1250 ... Static Pressure (mm H콿) 1,53
http://www.aerocooler.com/product_info.php?products_id=1459


Hmm, I stand corrected. ANYWAYS, 1.53mmH2O maximum static pressure is still pretty sad for a radiator fan. I would like to see some tests done with some properly high static pressure fans like the BGears, or just go with unholy power like the Delta 252s. Once again, deltas would only be good for proof of concept testing, they are far to pricy to be practical for a good price to performance ratio.

TO the OP, again, you'd be wise to listen to this guy:
Quote:
I do not believe that would perform well like others have said. You could fit a 3x120mm at the bottom, a 3x120mm up front and a 3x120mm up top easily enough. Radiators aren't very restrictive. A pair of MCP35X or D5-Varios would definitely be more than sufficient.

3x triple 120mm rads will be more than enough to cool any high end PC. You'd only need more power if you were cooling something like a 25v TEC chiller, or a server rack.
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post #18 of 18
Quote:
Originally Posted by Owee View Post

What if there was more spacing between a rad+fans - something shroud-like ? Aren't shrouds supposed to improve air flow in such cases ?

Shrouds help get rid of the "dead zone" most fans have, and allow the blades to more easily intake or outtake air. They will not in any way shape or form reduce flow restriction.
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