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gbwillson

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Reply with quote  #1 
Hi gang-

I recall the discussion using the words fans and blowers interchangeably took place a couple of years ago. I know I did, and still do. To me it doesn't matter what it's called as long as it makes the air move as I need. Anyway, this document will tell you more than you would ever care to know about these devices.

Enjoy!

Greg in MN[comp]

 
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pdf Fans_and_blowers.pdf (1.81 MB, 48 views)

Bert

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Reply with quote  #2 
That's a lot of info. Have to go over it a few times. It looks like my AC fan is a Centrifugal Backward Curved fan.

It seems to be better at overcoming resistance than an axial fan if I understood correctly.


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Bert K.
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gbwillson

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Bert-

Axial fans(the ones that look like a propeller) are good at moving air without much resistance. That's why duct booster fans don't work so well for what we are doing, as they are designed to help move air that is already moving. But axial fans are usually cheap, and if they do meet the CFM requirements, go for it. Now a 12v fan that moves a lot of air, and isn't too loud, is a bit harder to find. A car radiator, or transmission fan will possibly work, even a heater core fan will work, and they are usually centrifugal fans . If you are thinking of a 12v backup fan, noise isn't an issue, but as the everyday fan, you have to consider the noise factor.

Greg in MN
Bert

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Reply with quote  #4 
The fan for my next one will be in the garage, so it could probably be a bit louder. Not sure how the sound will travel through the ductwork.

I will see what they have for car heater fans. Haven't really checked that out yet.

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Bert K.
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stmbtwle

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Reply with quote  #5 
I got a car heater fan a while back, from an Explorer I think. it's quite powerful, BUT it was molded in as part of the entire duct system, along with the heater core and ac evaporator. I asked for a heater core and they gave the whole assembly. I had to cut it apart to salvage the components, no small job. I suspect all the newer vehicles are built the same way. An older or possibly commercial vehicle might be easier.

---------------------------------------

Did some searching and 120v fans and blowers are MUCH easier to find than 12v, not to mention MUCH cheaper.  So I did a little test.

I plugged a 9" 120v portable fan into a small inverter, turned the inverter on, and THEN connected it to a battery.  The inverter powered up followed by the fan.  I disconnected and reconnected the battery a second time and got the same results.  So the inverter (if left "on"), will power up automatically when power is available (such as a solar panel).  

My (tentative) conclusion was that a 120v fan or blower might be driven from 12v PV panel via a small inverter, no switches or controls required. It would make hunting for components a whole lot easier.

More testing is required but if it works it would be a whole lot cheaper than trying to find a 12v centrifugal blower.  The ONLY 12v centrifugal blower of any capacity I could find was a 4" marine bilge blower of 250cfm output... for $190.  Ouch.   

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Willie, Tampa Bay
Bert

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Reply with quote  #6 
Willie,

I keep forgetting about inverters. Thanks for jogging my memory. That may be a better idea.
I have two 100 solar panels with three 100 uh batteries. Wonder if the batteries and inverter could handle an AC fan that's almost 200 watts.

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stmbtwle

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Reply with quote  #7 
Only one way to find out. Certainly you can get an inverter that can. 200w converts to about 20 amps at 12v. Most any battery can handle that it's more a matter of for how long.
The pv panels probably cannot, directly, but they can charge the batteries.

Considering the aggravations batteries can cause, I'd avoid them if possible.

Since my last post I found a fair selection of 12v blowers on ZORO.COM. That said, DC motors usually have brushes which WILL eventually wear out. An AC motor usually does not, so may be more reliable.

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Willie, Tampa Bay
mocars2

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Reply with quote  #8 
With regards of a 12v fan - most 120v hair dryers are really a 12v small motor inside.

I've hooked up a hair dryer to a 20 watt panel and it runs great, - you have to take apart the hair dryer and connect 2 wires to the motor direct, and you have a 12v fan.



I would love to hear from you guys who can measure the CFM/MPH of a hair dryer because they seem to move some air - a little loud for some maybe, but for me that wont be a problem.

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