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Case airflow temp and water cooling. Learn something new every build

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post #1 of 1 (permalink) Old 05-17-2020, 03:42 PM - Thread Starter
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Case airflow temp and water cooling. Learn something new every build

I arranged the case and rad fans in what I think is unconventional. Compared to my corsair case, the Lian Li case just seems difficult to keep the aesthetics and practical case cooling.
I'm not giving up.
I decided to try both rads exhaust and the case fans intake.
I do have a slight negative pressure. I installed filters at the air flow entries for now.

I notice I was getting higher air temps at the bottom rad compared to the top rad. At first I thought it was pulling the hot exhaust air back into the case from the PSU.
I blocked the PCI from air entering the case and the temps climbed another degree. To the right of the bottom rad was another airway. I blocked that and it climbed even higher again.
I was running Aida Stress test on the GPU and CPU and the temps were steady. I think the CPU approached 90c and the GPU at 40c after half hour or so.
Then I thought, what if I slowed the bottom raid push/pull down and see how it affects the temps.
The top airflow temps increase and the bottom airflow temp decrease. I felt dumb.
I admit I been so focused on radiators and water cooling, I never thought about case airflow balancing. I also wouldn't believe just adjusting fan rpm's that you can watch temps in the case change that fast.

Even at idle I can see a difference in temps. The bottoms rads was just exhausting more air then the top and allowed the top to get the cooler air from the back.
In the end, I don't think it matters much since the water loop is balanced. The air flowing through that RAD did hit 31 deg during the stress test at 100% RPM.
Attached are screenshots at idle. 100% RPM and 50% RPM.

Current test arrangement below.....
  • I placed couple artic 140mm P14 and Noctua 92mm for intake on the flipside.
  • I put spacers behind the distro plate and removed grommets in a few key areas where the rear fans are.

Installed temp sensors located...
  • Flipside between the intake fans.
  • left fan of top rad
  • right fan of top rad
  • center of bottom rad.
Attached Thumbnails
Click image for larger version

Name:	Bottom Rad 100.jpg
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Click image for larger version

Name:	Bottom Rad 50.jpg
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Size:	243.1 KB
ID:	347084  

Click image for larger version

Name:	Case.jpg
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Size:	995.7 KB
ID:	347086  

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