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Part 1-Temp's With and With-Out Shrouds - Page 6

post #51 of 65
Analyzing your data to compare push vs. pull I noticed that all of the inlet air temperatures were low. They were several degrees lower in the push-pull and push only tests without shrouds. Further analysis showed the ambient was lower during the push-pull without shrouds, but not in the other one.

Is there a a sensor placement nuance that could account for the discrepency?


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post #52 of 65
Thread Starter 
Quote:
These tests were run with uncalibrated equipment and are meant only as a very simple test.The inline temp probes are the Alphacool brand inserted in a plastic T the tips are right in the flow.One before the rad and one after I have them attached to Compu-Nurse readouts.The air in and air out temp's are from flat tape thermisters attached to a CM Areogate read-out. Room ambients are taken with a flat thermister attached to a Compu-Nurse read-out.The hardest part was keeping the room ambients the same. I finally gave up and just averaged out room ambients which will skew results some itself.
Thats from post #1

Besides central air I have a window AC above my rig, that kicking on and off accounts for some of it....
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post #53 of 65
Quote:
Originally Posted by ira-k View Post
Thats from post #1

Besides central air I have a window AC above my rig, that kicking on and off accounts for some of it....

As it said, you ran the tests long so atmospherics would average out. And it was the ambient that changed, it was the ambient to air in. The paragraph doesn't say where the air in/out sensors are mounted, just how the data is recorded.

What I was trying to understand is why this one test had such a dramatic change in air in to ambient temperature. The all fluctuated. the two others without shrouds were slightly warmer relative to ambient. However the push without a shroud was way cooler. I'm thinking the sensor may have been near a high velocity part of the air leaving the fan, but then the push-pull without shrouds doesn't show this abnormality.
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post #54 of 65
Thread Starter 
I see what your saying now,I'll see if I can find my old notes on it...I always try to keep my intake and outlet probes about in the center between hub and frame and a inch or so above the fan....
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post #55 of 65
Cha-Ching. This is still good info. ready for part 3.
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post #56 of 65
Thread Starter 
Thanks...Look in post # 3, I used 4 of the little 47cfm Yate Loons and I was getting a 7. something rad out to ambient delta with a 320W load...Not bad really at all, just guessing it should be able to keep it at or under a 10C rad out to ambient with 400-500W..Thats what the rad manufacturers measure wattage dissipation at, what it will dissipate at a 10C delta..I really think thats to much, I try to keep mine at 5C and under....

I'd kind of like to re-do it sometime with just 86cfm Pana and see how it does....Unless you just have a heavy, heavy load on it the 86 should be over-kill on one anyway...

Next time I buy fans I'd like to try the 140 something cfm 3-blades Delta's on it, they pull massive amounts of h20 for a rad fan....

My GTX isstuffed on the second shelf of my bench right now, I wont be able to play with it much until I set up a new config with it..

This is MOAB (Mother of all Barbs) thats what fstfrddy named her, he built her...It has a 3/4" jet barb as her inlet, it might biggest jet barb on the planet, for a WC'ing block anyway......Its fed with 3/4"x1.25" tubing straight off my Iwaki...Its TEC so the 30W or so of pump heat hitting the block first doesn't really matter much, I have around 600W just from the TEC and chip anyway....

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post #57 of 65
Wow, I can't believe pull is better than push. Can anyone explain this?

I feel like push should be better as case fans are optimized for pushing power right?

How come everyone with TRUE's hasn't switched to pull?
Edited by mtbhrd - 1/7/09 at 11:04am
    
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post #58 of 65
Thread Starter 
Quote:
Originally Posted by mtbhrd View Post
Wow, I can't believe pull is better than push. Can anyone explain this?

I feel like push should be better as case fans are optimized for pushing power right?

How come everyone with TRUE's hasn't switched to pull?
A rad fan is sealed to the rad, the static pressure remains the same with push or pull. The only thing that changes is behavior of the air flow as it passes through the rad fins. On thinner lower fin per inch rads push does seem to work a little better then pull.
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post #59 of 65
Ah, okay. But what about the tests without a shroud?

Edit: Just read through the without shroud part again - saw you still taped the fans to the rad. Gotcha.
    
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post #60 of 65
Has anybody tested the effect of shrouds on air coolers like a TRUE or Noctua?
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