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Airflow on Radiator? - Page 3

post #21 of 26
It makes sense, at least in my mind. The air flows evenly into the back end of the fan, where the motor's hub blocks a portion of the flow. Hence why you'd need the shroud on the push side to give the airflow enough space to redirect back to the middle. Whereas on the pull side, when it hits the motor hub, it's already done its job by going through the rad, so shrouding it really doesn't improve much of anything.
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post #22 of 26
Quote:
Originally Posted by Martinm210 View Post
Only thing I would add is shrouds only seem to be really effective on the push side. After running 8 hours worth of testing on fan in pull and fan in pull with shroud I could only measure a 2.5% improvement at most, with one series reading -1.5%, so overall maybe a 1% gain.

It seems in pull the air is still undisturbed enough for an even distribution by pressure, but push compresses and concentrates the air so much, the shrouds really help there.

At least that's what I've been finding so far, but it might depend on the radiator density and fan speed too.
What rad were you using? I was getting 3C better temp's on pull with a shroud then with no shroud...And a 1.25C better then a push on a shroud only...Thats on the GTX...
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post #23 of 26
Quote:
Originally Posted by ira-k View Post
What rad were you using? I was getting 3C better temp's on pull with a shroud then with no shroud...And a 1.25C better then a push on a shroud only...Thats on the GTX...
An MCR320, that's probably why.

I figured I'll wait until I test the MCR220, then I'll try both sides of the radiator with push as well as pull. I only ran a few tests, but I did let them log for a few hours. I don't have enough fans or shrouds for the bigger rads to completely test.
    
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post #24 of 26
Quote:
Originally Posted by sledgehammer1990 View Post
In my new Velocity build, I will have a 2x120mm rad on the top and a 3x120mm rad on the bottom of the case. I just wanted to know if it is better to put the fans on the grill then the rad as to push the air through the rad or after the rad as to pull air through.
Pull is not always better than Push as some people will tell you. For example, in my TJ07, I have my fans set to push and intake cool air from outside the case.. rather than pulling hot air from inside case and exhausting it out. This results in much better performance. The most important factor is that you intake cool air from outside the case, and if you can accomplish this with pull then that is advisable, but push is acceptable too. The reason I cannot pull from outside air because trying to pull through radiator, and the sidewall mesh is much too restrictive.

There is only ± 1 degree difference in fan orientation, but if you increase the ambient air temperature by 10-15 degrees your results are going to be drastically different.
Edited by nettwerk - 7/4/08 at 7:08pm
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post #25 of 26
well.....all things considerd(SP)....you ALWAYS want to pull/push the cooler air....duh.....sorry not trying to diminish what anyone has said ......but ......duh
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post #26 of 26
Quote:
Originally Posted by Martinm210 View Post
An MCR320, that's probably why.

I figured I'll wait until I test the MCR220, then I'll try both sides of the radiator with push as well as pull. I only ran a few tests, but I did let them log for a few hours. I don't have enough fans or shrouds for the bigger rads to completely test.
Oh Yeah it has such a low fin per inch count, I don't think I ever tried a shroud on one, I know just playing around with it I would get about the same temp's in push or pull with it...A BIP I might of gotten a 1C better in pull, I really don't remember but it wasn't much...

I've heard that the PA it doesn't much matter with a pull or push, you would think it would do a little with pull since its a double row rad...

Have you ever tried a double pull yet? I'd try that on your GTX......
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