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Author Topic: SG-2440 temp lowered from 46C to 39C  (Read 1171 times)

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Offline WmArnold1

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SG-2440 temp lowered from 46C to 39C
« on: September 01, 2017, 11:58:20 am »


Greetings!

Fwiw, this SG-2440 runs dual-WAN, Snort, pfBlockerNG, and IPsec VPN with aplomb.

I was a little uncomfortable with the reported temperature of 46C (115F) tho..

Check-out my redneck hyperbolic chimney; it lowers the temp to 39C (102F)

Patent pending; to get one today; send $49.95 to ... ~grins~
« Last Edit: September 01, 2017, 08:56:53 pm by WmArnold1 »
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Offline ivor

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #1 on: September 01, 2017, 12:14:01 pm »
Nice! You might have better results if you take the SG-2440 off your switch ;)
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Offline WmArnold1

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #2 on: September 01, 2017, 12:36:42 pm »
Nice! You might have better results if you take the SG-2440 off your switch ;)

Thanks! But, if so; not much. I've also got pfSense running on a old AMD motherboard open-case PC with a cpu-fan and that runs between 38C and 39C. I was pleasantly surprised how much draft I got from this.

YMMV
« Last Edit: September 01, 2017, 01:09:37 pm by WmArnold1 »
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Offline NineX

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #3 on: September 03, 2017, 12:43:38 pm »
Try to add small fan on cpu.
No need to be high speed.
On my SG-4860 1U with small fan on cpu i have 29~31 C.

Offline stephenw10

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #4 on: September 05, 2017, 07:53:32 pm »
"Do NOT remove!"  ;D

Offline doktornotor

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #5 on: September 06, 2017, 05:33:54 am »
Does it work with KFC's gear? I hate McD... :P
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Offline WmArnold1

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #6 on: September 06, 2017, 11:12:53 pm »


"Do NOT remove!"  ;D

I need to write that higher on the cups too. "Hey, look; someone left their soft drink back there.."

Before I had the hyperbolic chimney idea, I just wanted to ensure that the grille wasn't covered
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Offline WmArnold1

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #7 on: September 06, 2017, 11:23:45 pm »
Does it work with KFC's gear? I hate McD... :P

KFC? Sure! There may be a better height & shape too. Warm-up the 3-D printer.. :-)
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Offline Harvy66

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #8 on: September 25, 2017, 07:33:55 am »
Below 50c is plenty fine. SSDs are most sensitive to heat and have a typical max of 50c-60c. CPUs can go much higher. Modern Intel server CPUs don't start to throttle until 110c and shutdown at 120c. I had a GPU that was 103c-108c when gaming and I gamed about 6-10 hours a day. Did that for 6 years before replacing it. I gave it to my brother where he used it for another year before upgrading.

Cool is better, but below boiling is fine. Except storage, they really don't want to be hot.

Offline stan-qaz

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #9 on: October 07, 2017, 08:19:46 pm »
I didn't want to put a fan on top and chance it failing and blocking the air flow so I got a small 12 volt squirrel cage blower and set it up blowing into the side vents. I'm powering it off a handy USB port on a nearby computer so it runs slow and quiet at 5 volts. If it dies there will be no airflow impact.

It is happily running at 34C in a 27C room.

I first tried an 18" chimney setup using some poster board that worked at cooling but failed the spousal approval test.

Offline Soarin

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #10 on: October 29, 2017, 12:11:39 am »
Can somebody explain how that decreases the temperature by such a large margin? I'm looking up hyperbolic chimneys and I'm even more confused because of the way OP set it up
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Online kejianshi

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #11 on: October 29, 2017, 12:33:35 am »
I submerge mine in ice water...

Offline NineX

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #12 on: October 29, 2017, 03:41:10 am »
Can somebody explain how that decreases the temperature by such a large margin? I'm looking up hyperbolic chimneys and I'm even more confused because of the way OP set it up

Physics my friend
heatsink warms air, this air being lighter is going up to chimney, it creates underpressure in casing, so cold air is sucked.

In theory longer chimney , this effect will be stronger.
https://en.wikipedia.org/wiki/Stack_effect

Offline dennypage

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #13 on: November 03, 2017, 02:27:56 am »
You might have better results if you take the SG-2440 off your switch ;)

All my desktop gear sits atop these which significantly lowers temperatures. It's also convenient for cable routing. :)

If you look closely, you can see them in my closet pic here.

Offline WmArnold1

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Re: SG-2440 temp lowered from 46C to 39C
« Reply #14 on: November 11, 2017, 09:58:32 am »
Can somebody explain how that decreases the temperature by such a large margin? I'm looking up hyperbolic chimneys and I'm even more confused because of the way OP set it up

OP here. Technically, it's just the stack-effect updraft, as nicely documented by NineX. And, taller is better to a point..

Stan-Gaz made an 18-inch straight chimney using poster board, but didn't say how well that worked. Since my chimney is only 14-inches, I expect he drafted a little better.

The base diameter is driven by the vent. Diameters above that can be reduced to save material when that's needed, to a point.. The Hyperbolic shape uses the least material between the three desired dimension points; base, waist-line, and outlet.

http://hvac-talk.com/vbb/showthread.php?135780-What-is-a-good-rule-of-thumb-regarding-duct-velocity says that duct velocity can go up to 600 FPS without turbulence. So, an arbitrary 1.5 inch diameter waist-line should pass up to 7.4 CFM, and I think our convective updraft is well below that.

Nuclear cooling facilities widen their tops so that the water-vapor does not shoot into the sky like a geyser does. Stack outlet velocity is actually regulated in places too.

My soda-cup version has a 4.25-inch inlet, 2.9-inch waist-line, and 3.8-inch outlet. There's obviously no benefit of enlarging our dimension above the waist-line here. But those soda-cups were really handy..

My next version will be a simple 24-inch conical tee-pee made from poster-board; 4.25 inches at the base, with a 1.5 inch opening at the top.  I'll post again when I get around to making that. (it might be a while tho.. ;-)
« Last Edit: November 16, 2017, 07:43:25 pm by WmArnold1 »
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