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Need advice, QL120 Pull (1500 RPM) + ML120 Push (2400 RPM)


KingEngineRevUp
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TL;DR at what RPM does the QL120 move 20 CFM? The relationship does not seem linear, I don't think I can just say 766 RPM = 20 CFM. Anyone have test data of QL120 in open air? Fan Speed vs. CFM?

 

I'm sure there is someone that has done this setup. I currently have ML120 in push pull and I'm about to mess this all up for aesthetics.

 

https://i.imgur.com/pjNuEaZ.jpg

 

https://i.imgur.com/MvJ1LuH.jpg

 

My goal is to match the CFM of the ML120 through radiator with the QL120 open air.

 

What I'm looking for is any test data for the QL120 in the open air. All I know is:

 

525 RPM = 13.7 CFM

 

1500 RPM = 41.8 CFM

 

And I have data for the ML120

 

https://www.techpowerup.com/review/corsair-ml120-pro-rgb/5.html

 

ML120 through radiator at 1750 RPM ≈ 40 CFM

 

So under load my plan is to have the QL120 run at 1500 RPM and the ml120 at 1750 RPM, this should match the air flow at 40 CFM through the radiator and hopefully won't sound bad.

 

But what about at idle? The ml120 at 750 RPM ≈ 20 CFM

 

Any advice is appreciated!

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those values are valid for the radiator they tested with. depending on how many FPI, what thickness etc, the flow values will vary a lot.

to get a rough estimate of the QL performances you can look at the numbers for LL and won't be too far off.

That said you'll most likely have to tune your fan curves in a more.. empirical manner.

 

the numbers they gave you was probably on an open bench setup. You'll have to deal with the back panel openings, back panel filters that willl drop further the fan airflow.

Mixing fans on a rad is always a nightmare ^^' the ML are the best at static pressure so just try not to have the QL impede them. most likely the QL will have to run faster since they are low static pressure, more general purpose fans.

Edited by LeDoyen
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those values are valid for the radiator they tested with. depending on how many FPI, what thickness etc, the flow values will vary a lot.

to get a rough estimate of the QL performances you can look at the numbers for LL and won't be too far off.

That said you'll most likely have to tune your fan curves in a more.. empirical manner.

 

the numbers they gave you was probably on an open bench setup. You'll have to deal with the back panel openings, back panel filters that willl drop further the fan airflow.

Mixing fans on a rad is always a nightmare ^^' the ML are the best at static pressure so just try not to have the QL impede them. most likely the QL will have to run faster since they are low static pressure, more general purpose fans.

 

I guess I'll just have to try it and see what happens.

 

Peop saynto match RPMs on mixed fans, I don't think that's correct, I think it's more important to match CFM but obviously that's much harder.

 

Although, like you said there's a lot that affects the CFM performance, it's the only data I have to work off of and I'll make adjustments as I got

 

QL120 1500 RPM and ML120 1750 - 1800 RPM will have to be my startingpoint for now.

 

I will also test both at 1500 RPM and see their performance and sound.

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