Arctic uses a fan to cool another fan | Hacker News Reader

Arctic uses a fan to cool another fan

tomshardware.com

46 pointsLorenDB29 comments

You see this all the time in large AC motors, even ones that power large fans. They have a small fan built into the rotor to cool the motor itself.

Video: https://youtu.be/gfkeR9vfmNo?t=86

Thumb gets pixelated at 1:30 ...

The title of this article really bugs me. It's only one fan, it's cooling itself!!

> Arctic seems surprisingly disinterested in advertising its new fan, even though it represents a step up in performance in its class. The company deletes or ignores Arctic subreddit posts, press releases are difficult to find, and very few outlets have reported on the fan's real-world performance. Those interested in using the extreme high-pressure fan in 3U+ servers or workstations can find it for $14.99 from Amazon.

Am I just totally jaded or does whole article this feel a lot like shady native advertising?

It's not you, it definitely feels that way. It's five paragraphs about a fan that by all appearances the author has never seen in person, with a high density of fluffy positive language and ending with an Amazon affiliate link.

At a minimum Tom's Hardware is just fishing for clicks on their affiliate link, but it also definitely smells of a paid ad.

> [...] 11.45 mmH₂O of static pressure [...]

I don't think I've ever seen anyone use these units for pressure? What happened to Pascal?

Nearly all case fan brands use mmH₂O. No idea why, but that's what they do.

He walked into a bar.

...I'll see myself out.

Someone said hectopascals and was, unfortunately, misunderstood.

... As per commenter below, will also see myself out.

Inches of water is sometimes seen for retail vacuums in shop & household use. I have no idea where it came from - perhaps marketing where it gives a buyer an easy to visualize physical model for comparative purposes.

mmHg is reasonably common because that's how the first pressure gauges worked, and measuring how much a pressurized gas or liquid can move mercury against gravity is easy and reliable enough that this style stayed in use for 300 years [1]. But 0.8mmHg isn't a very impressive number, so at some point someone got the bright idea to use mmH₂O instead.

[1] https://en.wikipedia.org/wiki/Mercury_pressure_gauge

I have seen it a few times for vacuum cleaners.

Anyways, the conversion is easy: 1 mmH₂O is g Pascals, g = 9.80665, the Earth gravity, often rounded to 10.

It is actually easy to calculate:

1 Pa is 1 N/m²

1 N is the force needed to accelerate 1 kg at 1 m/s², the acceleration due to Earth gravity is "g", so, because F=ma, 1 kilogram-force under Earth gravity is g N.

Density of water is 1 kg/L, a column of water 1mm high with a 1m² base has a volume of 1/1000 of a m³, or a liter, so that column weights 1 kg.

Therefore that column exerts a force of g N on 1m², or g Pa. So 1 mmH₂O = g Pa =~ 10 Pa = 1daPa

I have never seen the daPa used as a unit, but the daN is common, because 1 daN so close to 1 kgf (kilogram-force).

Yes, the conversion is fairly straightforward and not worse than medical people using mmHg. Still a weird unit.

US doing everything possible to not use the metric system

Then they should properly be using inchH2O?

Is "Fan inside a Fan" a new design for DC? Or is it something available in hyper scale only to come out now with Arctic?

They have these in a smaller 80mm size, I have two - they are weirdly great? Relatively quiet at half speed and move crazy amounts of air, compared to other 80mm fans I have.

The fan in the center cools the motor which I assume increases MTFB.

They're 38mm thick and adding extra thickness to fans improves performance by a lot, but for some reason consumer PC component brands have rarely ventured beyond 25mm until quite recently.

That looks like an AI hallucination

Maybe that's how they came up with the idea.

It’s fans all the way down.

Yo dawg...

The SAN ACE 8080 takes this concept to a new level

Quick someone tag linus in here so he can do a review and claim 20% performance increase \s

We found a way to make your nice large quiet fan have a squeel sound in 1 year so you have to replace it sooner.

This is designed for servers, noise is the least of its concerns. Everything in a datacenter has fans that sound like they're trying to launch the machine into orbit.

This is a server fan, it's already really loud.

have you ever been in a DC? they loud af boiiiiiii

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