REAL air cooling [Archive] - Icrontic Forums

Geeky1

16 Nov 2003, 07:27am

I know I've mentioned this thing before, but I don't think I've ever posted anything detailed about it.

Somehow, I am going to get this fan on a computer case. How, I don't know. When, I have no idea. But one way or another, it's going on a damn computer case.

Geeky1

16 Nov 2003, 07:28am

Oh, and I deliberately took those with no way of seeing the scale.
The following pics should give you an idea of the size of the fan:

Geeky1

16 Nov 2003, 07:29am

My laptop is 13" wide by 11.4" deep, and that's a 12" ruler. That give you an idea of the size of the fan?

It's 16" in diameter.
It flows somewhere around 2000cfm
It sounds like a cessna
And it draws more than 35a @ 12v, which is where the problem with attaching it to a computer case comes in... I need to power it. And I'm too cheap to buy a PS for it ATM.

But, at some point, one of my computers will have a radiator fan out of a 1987 Mercedes 560SEL. :D

mcwc

16 Nov 2003, 07:31am

Is that a radiator fan? What's the current draw on that sucker? It is probably is the amp range, not milliamp.

I think you can use a few zip ties to temporary strap it onto your case.

//Edit: you just answered my current draw question.

Geeky1

16 Nov 2003, 07:35am

Yes, it's a radiator (well, AC Condensor/aux., anyhow) fan.
The current draw is anybody's guess. All I know is that when I hook it up to my 35a 50% duty cycle/25a constant @ 13.8vdc bench PS, if I have ANYTHING else hooked up to it at all, even a dinky sub-2w 80mm fan, neither fan will power up.

It draws enough current to make molex connectors melt. I left it on for 5 minutes, with it connected to a molex connector w/18ga wire and alligator clips. The wire got burning hot, and the molex connectors were hot enough @ the end of 5 minutes to be soft (I could mold them with my fingers). So it draws an @ssload of power.

a2jfreak

16 Nov 2003, 07:40am

Maybe you should build a yattamonster and use one as the intake fan and one as the exhaust fan.

Geeky1

16 Nov 2003, 07:43am

either that or pick up an aluminum case, build a skirt for it, and make a hovercraft...

madmat

16 Nov 2003, 08:03am

May I suggest a racing case...

Mt_Goat

16 Nov 2003, 08:37am

Hovercraft case racing???

TheLostSwede

16 Nov 2003, 11:17am

The biggest problem is to FIND a ps that can power that thing.

Not even meanwell's otherwise awesome ps will be enough.

Close to 40 amps on 12V isn't any picnic. I think you need some sort of startup motor and a car battery to use that thing.

SimGuy

17 Nov 2003, 02:55am

What about an external 12V transformer from Radio Shaft (or any bulk electronics store)?

There are plenty of transformers that will change 120/240 into 12V, but it may be hard to find one that delivers 35A....

Geeky1

17 Nov 2003, 02:56am

I've got one that does 35a now. It's not big enough.

Maybe I can get my siblings to run in a giant hamster wheel hooked up to a generator... hmm... :D

SimGuy

17 Nov 2003, 03:11am

Even 100,000V generator wouldn't be enough to power that fan if it didn't have 35A behind it :)

Straight_Man

17 Nov 2003, 03:18am

Jameco carries linear (single voltage out) industrial PSUs. Not cheap, but will work for this. Esentially a stepdown transformer with a wave remnover\voltage level stabilizer circuit. They have, and I have seen, 40+ AMP 12 volters.

John.

NoFuture

17 Nov 2003, 03:19am

Maybe you can try building yourself a 12V power supply powerful enough for this big s*cker.

Leonardo

17 Nov 2003, 03:19am

You'll have to bolt your computer case down so it doesn't zoom forward and terrorize your family. I can see the headlines now - "Failed computer experiment injures for in a Bay area home". :eek2:

Geeky1

17 Nov 2003, 03:24am

I'm planning on using it when I go away to college and have to share a dorm. I was not kidding when I said it sounded like a cessna. It does. Both in the sound and the noise output. :D

Straight_Man

17 Nov 2003, 03:43am

BE cheaper to run it off a car battery and charging circuit, with a deep cycle cold weather battery and a car battery charger circuit on most of time in auto mode, or off a high-ampere car battery charger.

John.

muddocktor

17 Nov 2003, 04:41am

I was just going to suggest a high current battery charger myself, Ageek. But even a battery charger that can supply that much power will not be cheap.

EDIT: Here's a power supply for your fan, Geeky! (http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=TOOL&pid=02871230000&adCell=P10) ;D

Geeky1

17 Nov 2003, 05:04am

Simguy, it's a 35a @ 13.8vdc PS...

mudd/ageek... I was thinking something more like this:

fuxor

17 Nov 2003, 09:54am

maybe http://www.allelectronics.com/ would have something?