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post #31 of 45 (permalink) Old 01-13-2020, 11:01 AM
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Quote: Originally Posted by Darren9 View Post
Below 20 kelvin nothing in air remains gas, it's all turned to liquid or solid and left a vacuum - not so good for air cooling

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post #32 of 45 (permalink) Old 01-14-2020, 11:12 AM
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Quote: Originally Posted by The Pook View Post
shhhhhhhhhhh

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I think you mean frozen scientist in peace (pieces if dropped).

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post #33 of 45 (permalink) Old 01-14-2020, 01:45 PM - Thread Starter
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Well now you have to wonder if the vacuum of space would be adequate cooling. Provided it's far enough away from any other heat source, so as to not receive heat from that source.

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post #34 of 45 (permalink) Old 01-14-2020, 03:47 PM
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Quote: Originally Posted by Owterspace View Post
Filters aren’t in my future, and between the kids, the pets, carpet, location.. dust happens. I could run filters but I’d rather not because I worked hard for that 2c
I don't think you can run your PC with filters man. Seems imposible to me.

It's gonna eat the front one and spit out the on one the top.....
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post #35 of 45 (permalink) Old 01-14-2020, 04:19 PM
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Quote: Originally Posted by PhotonFanatic View Post
Well now you have to wonder if the vacuum of space would be adequate cooling. Provided it's far enough away from any other heat source, so as to not receive heat from that source.
It is actually difficult to cool in a vacuum. You don't have a medium to use for conduction or convection, you have to use radiation. They use flat panel radiators that emit in IR, and try to reflect higher wavelengths. It is something like one square meter to dissipate a few hundred watts. If you look at the ISS, the large white panels on trusses are radiators.

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post #36 of 45 (permalink) Old 01-18-2020, 04:00 PM
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Quote: Originally Posted by briank View Post
The Pook is spot on. But if you can't chill your room quite that cool, the actual best case air cooling is achieved by servers. If you look at how a server is designed, the box is completely sealed with only openings in the front and back. Fans pull air in the front and move it at a very high speed across all the components before expelling it out the back. Linear air speed over the components is the most important metric when you are cooling components with air.

Many cases out there have venting all over the place and that ruins any kind of evenly distributed, front to back (or bottom to top) airflow. Even the good ones like a Fractal case still would need to work to really seal it up well.
It's more than just the 1U cases and air flow that cool a racked server though. It's the cabinets themselves which usually exhaust hot air not into the server room but into an exhaust trunk and serve to further isolate intake air from exhaust air. Server rooms themselves are also climate controlled and kept cool. Then there's the noise of hundreds of high CFM, high static pressure fans.

The heatsinks used in 1U servers don't look very substantial either, it's like they rely exclusively on extremely loud, high air flow at high pressure to work.
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post #37 of 45 (permalink) Old 01-18-2020, 04:10 PM
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Quote: Originally Posted by Shenhua View Post
Configure case fans to work like a GPU, adapting to your workload, with starting temperature and custom curve. They will spin only when you need them to spin, and at the speed you require, not more, nor less. That, combined a with highly positive pressure setup, will make dust take a very long time to accumulate enough to screw cooling performance.
Clean dust that deposit on the on the case regularly. That should be enough.

In my case, while i did open it for tweaks, i havent cleaned it, in last 2 years. Have the same temps, and it's not even very dusty. Also, i noticed, the dust doesn't accumulate like fur balls, even on the radiators..... not guaranteeing ppl that they will get the same result as me, but it should take much more time for dust to pile up.

Hope it helps.
I'd like to see concrete proof that anyone using an off-the-shelf case has ever managed to achieve positive pressure in that case (positive pressure as in measurable mmHG over atmospheric) because when I think air-tight I think gaskets, seals, precisely machined joints, matching surfaces and many bolts -- none of which describe a consumer computer case. And as Doyll has pointed out numerous times before the static pressure generated by muffin fans is abysmally low, even if using vane-axials (which are rarely used in computer cases because they're noisier than non-vane-axials).

If you live in a dusty region like the desert or near the beach dust is the nightmare that never stops infiltrating your computer case and house if you don't live in a central air-conditioned domicile w/external filtration.
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post #38 of 45 (permalink) Old 01-18-2020, 04:19 PM
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Quote: Originally Posted by 8051 View Post
I'd like to see concrete proof that anyone using an off-the-shelf case has ever managed to achieve positive pressure in that case (positive pressure as in measurable mmHG over atmospheric) because when I think air-tight I think gaskets, seals, precisely machined joints, matching surfaces and many bolts -- none of which describe a consumer computer case. And as Doyll has pointed out numerous times before the static pressure generated by muffin fans is abysmally low, even if using vane-axials (which are rarely used in computer cases because they're noisier than non-vane-axials).



If you live in a dusty region like the desert or near the beach dust is the nightmare that never stops infiltrating your computer case and house if you don't live in a central air-conditioned domicile w/external filtration.
I live at 800m of the sea.
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post #39 of 45 (permalink) Old 01-18-2020, 07:25 PM
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Quote: Originally Posted by PhotonFanatic View Post
Well now you have to wonder if the vacuum of space would be adequate cooling. Provided it's far enough away from any other heat source, so as to not receive heat from that source.
interstellar spaces is around -270 C temp around the earth is around 10 C
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post #40 of 45 (permalink) Old 01-19-2020, 01:48 PM
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Space does not have a temperature. Objects in space can have temperatures.

Voyager 2 measured the plasma in the VLISM (very local interstellar medium) to be 30,000-50,000K.

As it relates to air cooling, the densities out 18 billion km from the Sun are very low. Same with nearly anywhere else in vacuum. So it does not heat Voyager 2 much. Similarly, if you are in LEO in shadow where gas temperature is lower, you can't cool much of anything either.

2.7K comes from cosmic background radiation, and that is really a shorthand*. But since space is not matter it can't have a temperature (photons from background radiation don't either.

*that is that an object some place where it receives no other radiation would eventually cool to that temp

edit:

I was playing with Stefan-Boltzmann for a 37 x 37 x 3.5mm Ryzen IHS.

Using emissivity of nickel (0.03... very bad), and a temperature of 70C (343.15K), and assuming it is in shadow facing deep space, I get that it could radiate ~0.045W.

Raising the temperature to 105C (378.15K), I get 0.065W. If I lapped it to copper (e=0.052), then it could radiate 0.077W at 70C, or 0.11W at 105C.

Even if it was a "blackbody" (e=1), that is still only 2.2W at 105C, or ~1.5W at 70C.

I need to use heatpipes and connect it to a large flat panel (it is starting to sound like a spacecraft radiator...)

A 1 square meter panel of copper at 70C could radiate ~41W.

If emissivity is raised to 0.8 with coating, then at 0C it could radiate ~250W. That is at the bottom of optimal range for aluminum and ammonia heatpipe radiators apparently. So may make sense to downsize the panel, or maybe use it for the whole system.

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Last edited by hazium233; 01-19-2020 at 08:46 PM.
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