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Old July 7, 2008, 05:55 PM
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Default 12v vs 24v

So I "may" have access to a 24v ac/dc (I think) power supply..

Are there any benefits in running a 24v fan over a 12v fan?

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Last edited by enaberif; July 7, 2008 at 06:00 PM.
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Old July 7, 2008, 06:46 PM
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It would run a lot higher than spec for a short time, until the motor burned out. It would also have a huge increase in noise, but not as large of an increase in air movement. Might be useful for a TEC or something similar.
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Old July 7, 2008, 06:47 PM
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Ya, they run twice as fast!

OK, sorry, smartass comment aside, where would you get these 24v fans? A marine outlet? Which ones are you looking at?
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Old July 7, 2008, 06:51 PM
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Well would you get more air for a quieter fan?

Or would it be the same amount of noise for the same amount of air?
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Old July 7, 2008, 06:53 PM
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just off hand, I'd say no advantage one way or the other really.
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Old July 7, 2008, 06:58 PM
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Hmm, thinking back to my BCIT dc motors class, I'd think that it is the actual fan blades and bearing noise that you'd hear. If the fan blades and bearing were identical, you'd hear the same db noise. You're not changing the RPM of output shaft, just the input voltage into a different motor.

I'd check rated CFM and db noise level on the fans you're interested in. Now, you may be able to find some higher CFM 24V fans and undervolt them if noise is a factor for you.

Interesting, thanks for making me think back to Class of 90 Robotics and Automation.

Edit: perfect timing, now my extra power cables have vibrated forward and are touching my bottom fan. Gotta take the cover off the 900. Probably wouldn't have happened if we weren't talking about fans. No one mention HD's please.
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Old July 8, 2008, 05:18 AM
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Quote:
Originally Posted by enaberif View Post
Are there any benefits in running a 24v fan over a 12v fan?
Only if you can find fans that perform "better" than the ones you have. In this case "better" is more CFM, less noise, or whatever floats your boat.

If you want extreme go to lines powered squirrel cage blowers. They are reasonably quiet and could easily move 500-1000 CFM. They would also be as big as your case and dangerous to small animals.
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Old July 8, 2008, 12:39 PM
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Quite often, a device using a higher input voltage can get slightly better efficiency (i.e. PSU's running 220V instead of 110V.), which would translate into less heat dissipated, but that's really not an issue where a fan is concerned. Noise-wise, I wouldn't expect the voltage to make any difference at all, although obviously different fan designs will matter. If there's some fan out there with an uber-magical noise/cfm ratio, that only runs on 24V, then that might justify the trouble. But I can't see it being worth the bother otherwise.

That said, you've got some rigs on water, right? If you're going grab yourself a 24V power supply, why not grab yourself an Iwaki RD-30?
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