100 mm , 100+cfm DC axial fan suggestions needed

voner · Post by **voner** » Mon Mar 09, 2009 6:40 am

I know this seems like it's off the subject of this forum, however you guys seem to be the experts on quiet DC fans........

I have built a experimental solar air panel system -- it's an old hot water panel that has been retrofitted to just run air through it, and a fan will push the air from my house through it and then back into the house when the sun is shining and the panel is hot enough. I have hooked up a AC fan to it and it works and I am testing the fan speeds that are necessary to push the air most efficiently. I started with AC, because I had a bunch of 4 inch AC fans, that were very high quality ball bearing fans, sitting around.

It appears that I need a fan that pushes 100 to maybe even 150 CFM.

After the system is stable, I want to convert the system to DC and run off the DC system possibly even just a simple small PV panel.

The final design, I hope, will include a DC fan with a thermostaticly controlled fan controller that will vary the fan speed according to the temperature inside the panel.

I detest fan noise, so your help would be quite valuable in many ways. I hope to have a fan that is over powered for the panel slightly, so I can keep the fan noise to a minimum and never push the fan into speeds that are real high, and thus noisier.

My hole is currently 4 inches -- and that is the size of my ductwork, so I need a 4 inch (100mm) fan. This means I guess, to use a DC fan I will probably go with a 92 mm fan -- that means the duct size will not strain the fan.

Please send me your suggestions for fans, or fans and fan controller outfits, to consider. I would like to keep the cost total under $70....

Thank you very much, and I'm sure in the future your help will help out other people who are considering to do other similar projects.

voner

CyberDog · Post by **CyberDog** » Mon Mar 09, 2009 10:42 am

http://www.performance-pcs.com/catalog/ ... s_id=21950

[/url]http://www.performance-pcs.com/catalog/ ... =20843[url]

For some suggestion. There is not many fans that can deliver that much air...

You can find other from that site also.

CyberDog · Post by **CyberDog** » Mon Mar 09, 2009 10:42 am

double post...

Mr Evil · Post by **Mr Evil** » Mon Mar 09, 2009 12:31 pm

Forgive me if I'm stating the obvious, but wouldn't it be better to pump water through the panel and then through a radiator inside your house, with a fan on the radiator?