Gold & Silver Forum (http://goldismoney.info/forums/index.php)
- Survival Prep (http://goldismoney.info/forums/forumdisplay.php?f=141)
- - Uses for powerful fans (http://goldismoney.info/forums/showthread.php?t=424688)

shades2 | 11-17-2009 07:24 AM
Uses for powerful fans I've been given some nice 24V 1.0A DC ball-bearing fans, which move about 11L/second. I'm able to run these of SLA 12V batteries in series, which provide about 24.3V DC. They are built like a tank with metal frames. The only down-side is the amount of noise they make which is significant. One use I have, is when soldering, as I hate solder fumes, and I'm sure they're no good, to vent those through a tube outside. Can anyone think up other crafty uses for these? If I attach a suitable potentiometer I should be able to vary the speed also right? SPECIFICATIONS:- Manufacturer: ROTRON Mfg Part #: PQ24B6QDNX Tedss Item ID: 2031000143 METAL FRAME. 7 BLADE. 24VDC. 1A. POLARY PROTECTED. SIZE 171.5 MM / 6.75 IN. Diameter 6.75" 171.4mm Height 2" 50.8mm SPECIFICATIONS supply voltage: 24 VDC (MAX) supply current: 1.00 A (MAX at 24VDC) power rating: 24.00 W (MAX RATING) flow rate: 235.0 CFM (NICE) 11.090825 L/second? connection type: WIRES

hoarder | 11-17-2009 07:42 AM
Re: Uses for powerful fans Quote:
Originally Posted by shades2 (Post 2029569) supply voltage: 24 VDC (MAX)
I'd put classified ads in off grid forums. My cieling fans are designed to operate either on 12 VDC or 24 VDC without any modifications. Hook up 12 VDC to one of them and see how it works. They might make good bathroom fans or stove vent hood fans. They also might make good cooling fans for ATV's. Many ATV's are air-cooled but when the ATV is used for weed spraying when it doesn't get much air flow, or slowly going up a steep mountain they overheat. I bought a 8" fan for mine. 235 CFM is a LOT for a little fan like that. No wonder they're loud.

Professur | 11-17-2009 08:06 AM
Re: Uses for powerful fans They'll run on 12V, but a lot quieter. In computers, we frequently downgrunge fans by connecting them to the +12v and +5V taps instead of +12V and ground. That gives them 7V to work with. Here's the thing. Most small fans are overpowered. The noise they make is caused by cavitation, a vacuum 'hole' produced behind the blades when air can't move in as fast as it's moved out the front. By slowing it down, the noise level drops dramatically, but usually the temp of whatever's being cooled isn't significantly effected. On most old computer power supplies, you can find -12V, -5V, +5V and +12V taps. Play around with them to see what works best. Remember with non-switching power supplies to keep a load on it at all times, or it'll blow.

shades2 | 11-17-2009 08:40 AM
Re: Uses for powerful fans Quote:
Originally Posted by Professur (Post 2029600) They'll run on 12V, but a lot quieter. In computers, we frequently downgrunge fans by connecting them to the +12v and +5V taps instead of +12V and ground. That gives them 7V to work with. Here's the thing. Most small fans are overpowered. The noise they make is caused by cavitation, a vacuum 'hole' produced behind the blades when air can't move in as fast as it's moved out the front. By slowing it down, the noise level drops dramatically, but usually the temp of whatever's being cooled isn't significantly effected. On most old computer power supplies, you can find -12V, -5V, +5V and +12V taps. Play around with them to see what works best. Remember with non-switching power supplies to keep a load on it at all times, or it'll blow.
Thanks, I dropped them back to 12V and apart from some initial bearing startup noise, they are much more bearable. I still might go for a potentiometer to vary the speed as desired.

shades2 | 11-17-2009 08:46 AM
Re: Uses for powerful fans Quote:
Originally Posted by hoarder (Post 2029585) I'd put classified ads in off grid forums. My cieling fans are designed to operate either on 12 VDC or 24 VDC without any modifications. Hook up 12 VDC to one of them and see how it works. They might make good bathroom fans or stove vent hood fans. They also might make good cooling fans for ATV's. Many ATV's are air-cooled but when the ATV is used for weed spraying when it doesn't get much air flow, or slowly going up a steep mountain they overheat. I bought a 8" fan for mine. 235 CFM is a LOT for a little fan like that. No wonder they're loud.
Yeah it's a SIGNIFICANT amount of air they move, they were designed for a cooling tray for a large router unit, which when fully populated with cards would require such cooling in a computer room. Very overspecced. I might get hold of a 12V 0.5A or similar DC plug adaptor and utilise them in the bathroom or stove area as you have suggested, as they are ideal for that. Being ball bearing fans they could run all day, but in this short-cycle type use they'll last 20 years and move all the necessary air required. The ATV thing is interesting, I didn't know they had heating problems going up-hill, but I guess it's similar to a motorbike idling, they hate it on a warm day, and air-cooled or liquid cooled, they still need the airflow with their small radiators etc. to prevent overheating. I've changed a few radiators on motorbikes so I'm pretty familiar with those fans and how they cool themselves. My water-cooled bikes will even run the fans after shutdown for a while to cool off.

hoarder | 11-17-2009 09:08 AM
Re: Uses for powerful fans I was confused about the CFM's in my earlier post. My 8" fan puts out 800 CFM. http://www.alamomotorsports.com/pmc/Cat_page18.html When I built this cabin I couldn't find any suitable DC fans and had to double up 4" computer fans for the vent hood and fartfan. Although I didn't, some off grid people who have wood heat use DC fans to circulate warm air thruout the house. I just use the cieling fans.

SilverCat | 11-17-2009 09:20 AM
Re: Uses for powerful fans Frankly, I think fans blow.

Professur | 11-17-2009 09:21 AM
Re: Uses for powerful fans When I put the wood floor over the slab in the basement, I installed a few fans like that here and there to push air under the plywood to keep it drier.

shades2 | 11-17-2009 10:07 AM
Re: Uses for powerful fans Another use might be as a blower to feed air into a small refractory furnace for smelting stuff... Not feasible where I am here though.

Golddust | 11-17-2009 10:55 AM
Re: Uses for powerful fans Quote:
Originally Posted by shades2 (Post 2029786) Another use might be as a blower to feed air into a small refractory furnace for smelting stuff... Not feasible where I am here though.
Have used the exhaust from old vacuum cleaners to do just that.. Works on vacuum cleaners that you can hook up the hose to the exhaust instead of the input. Also works great burning big pine needle piles , hook vac hose to a pipe and place end of pipe in bottom of leaf pile and let it rip...:yes: (Anyone that has burned pine needles know it takes forever because they pack down) Takes way way less time to burn a bunch of pine needles!

Professur | 11-17-2009 11:09 AM
Re: Uses for powerful fans Yeah, but you get the FD on the run with the 30 foot tall flames.

Golddust | 11-17-2009 11:11 AM
Re: Uses for powerful fans Quote:
Originally Posted by Professur (Post 2029886) Yeah, but you get the FD on the run with the 30 foot tall flames.
Just depends on how you do it....:coolbeer: It does take hours off the job...:biggrin:

electric-amish | 11-17-2009 11:20 AM
Re: Uses for powerful fans I saw on a forum where a Man took a squirle cage fan and blew it through---or sucked it through a 50 Cal ammo can full of activated charcoal for over pressureizing a room in case on NBC hazard. E-A

BullionCubed | 11-18-2009 05:57 PM
Re: Uses for powerful fans run 2 in series at 12 volts so each runs at 6 volts and see how quiet they are

All times are GMT -4. The time now is 09:46 AM. |

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2010, Jelsoft Enterprises Ltd.
Copyright = None use it and Link to GIM