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 Post subject: low current 12V fan
 Post Posted: Mon Jun 02, 2014 2:05 pm 
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Joined: Sun Feb 07, 2010 2:47 pm
Posts: 94
Hi Scott,

This is not really relevant to the forum. However, compared to me you are an expert on low current, high volume 12V fans that are used in cooling computers. I thought since you know so much about them it might be easy for you to give me a recommendation for one.

I am looking for a low current, high volume fan to use in a swamp cooler I am building for my van. The cross sectional area that the fan needs to cover is about a square foot. This is much higher than your typical cross sectional area of your typical computer-cooling fans. However, it may be that I can use an array of several low-cost fans.

So any recommendation would probably be helpful.


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 Post subject: Re: low current 12V fan
 Post Posted: Mon Jun 02, 2014 10:49 pm 
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I recommend checking out Electronics Cooling magazine. You can read or download current and past issues on-line, and even the subscription to the physical magazine is free. Many if not most of the high-quality fan manufacturers advertise there. From that you can find their catalogs to see if they have any fans suitable for your purpose. I believe a single large fan would far outperform multiple smaller ones both in cooling and efficiency. Let me know what you find, Scott.


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 Post subject: Re: low current 12V fan
 Post Posted: Fri Jun 06, 2014 6:21 pm 
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Thanks so much for replying Scott. You really didn't have to I know.

It worked out from the geometry of the swamp cooler that using three in-line 120mm fans worked better than a really big one.

Thanks,
Bob


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 Post subject: Re: low current 12V fan
 Post Posted: Fri Jun 06, 2014 6:33 pm 
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How do you wire the 3 wire fans?


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 Post subject: Re: low current 12V fan
 Post Posted: Fri Jun 06, 2014 9:11 pm 
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The third wire is a tachometer signal, which probably wouldn't be used in your application unless you are powering them with a source that can monitor the fan speed(s). Scott.


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 Post subject: Re: low current 12V fan
 Post Posted: Sat Jun 07, 2014 10:25 am 
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So, I'll just wire the ground and 12V and leave the other lead and expect it to run at full speed.

Thanks,
Bob


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 Post subject: Re: low current 12V fan
 Post Posted: Tue Jun 24, 2014 3:22 pm 
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I used 3 cheap 120mm fans that are rated at 124 CFM. Altogether they are using about 20W. They cost under $10 a piece.

They seem to be putting out enough volume to keep the van cool. My only complaint is that they are noisy. But that isn't something you really find out about until you've bought them. All in all I'm pretty pleased. Thanks, Scott.


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 Post subject: Re: low current 12V fan
 Post Posted: Tue Jun 24, 2014 5:28 pm 
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I'm glad it worked out, thanks for letting me know the results. Scott.


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