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post #31 of 34
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FYI,
Some updated results and one experiment with two fans on top of each other.

I also fooled around with my anemometer and even with a foot long duct, the air flow is still very uneven in push. Pull however is very even and consistent.

My guess of push/pull vs. push/push vs. pull/pull is that pull/pull will do the best. Not only do you get no heat from the fan affecting the radiator air inlet, but you also have straighter air flow...?

I'll try this when I get to the RS120, maybe even put three of them together for the heck of it.
    
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post #32 of 34
Was one of the readings two fans in series? If so, were you able to measure the noise levels? I would be curious how the noise and PQ curves varied between that setup, the Panaflo, and the 2000rpm Scythe.

Of course we would need the radiator PQ curve for comparison!!!
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post #33 of 34
Thread Starter 
Quote:
Originally Posted by DavidNJ View Post
Was one of the readings two fans in series? If so, were you able to measure the noise levels? I would be curious how the noise and PQ curves varied between that setup, the Panaflo, and the 2000rpm Scythe.

Of course we would need the radiator PQ curve for comparison!!!
Yes, the second longer red bar was two in series.

Sound leve is something I'm struggling to measure well, my house is extremely noisy, you almost need a separate quiet sound room to make any reliable reading. I usually do my pump sound measurements late at night when eveyone has already gone to bed.

The two yates in series was pretty quiet though, it's almost as if the outer fan does some sound muffling of the inner fan.

Still waiting for my new dwyer gauge, but I did just get back from the home improvement center and picked up a 2" PVC ball valve I plan to try for controlling flow and pressure.

Since fans perform better in pull, I plan to do all my testing in a pull condition. I'll post some pictures when I get it put together.
    
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post #34 of 34
Thread Starter 
Here was my first experiment for rigging a way to control flow.

Flow was from right to left through the anemometer then a coupler that I machined to fit the anemometer, then a 2" PVC globe valve that is theaded into the pressure box.

It was all built very well, but unfortunately it's too restrictive, only getting about half the flow rate, so I'll have to figure something else out.




I'm going to get a few more fans to test pressure on from Petra's, so I figured I'd go ahead a create a quick page for this here:
http://www.martinsliquidlab.com/FanTesting.html
    
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