DIY ventilation heat exchanger - Page 10

Xringer · 07-14-10, 06:58 AM

Quote:

Originally Posted by AC_Hacker

BTW...

This is very off topic, but here's an interesting How-To:

How to Convert a Computer ATX Power Supply to a Lab Power Supply.

-AC_Hacker

Those things are pretty well made.. At least this design looks nice..
200W ATX PC POWER SUPPLY

Wow! 300vdc! The 120-240 switching is simple anyways..

AC_Hacker · 07-14-10, 02:16 PM

Quote:

Originally Posted by jrandom_EE

I think first getting an idea of the appropriate static pressure needed would be a good first step. Make a manometer tube, use an over-sized fan, and block it until it gives the right flow rate. A simple hack method of measuring would be using a cylindrical outlet and wafting smoke from an incense stick down it, and calculating the CFM from the rate of movement of the smoke. Then use that to look up the right fan.

I have a dandy blower to do tests with but I can't make it work.

It's a capacitive-start AC motor.

Here's a photo of the wires & connector:

Here's a photo of the connector with the DC resistance I measured across the various terminal combinations:

...and here's a photo of the only identification on the fan:

The fan came from a range hood blower. This fan was one of two., the other motor has a broken internal support. As I read the label, it says Elica, which seems to be a maker of range hoods made in Italy.

I searched for "Elica schematic", "Elica wiring", "Elica diagram", but wasn't able to find any helpful info.

Any ideas?

-AC_Hacker

? ? ?

AC_Hacker · 07-14-10, 03:49 PM

Quite by accident, I came across this app note:

Brushless DC Motor Control using ATmega32M1

Looks like the ATmega32M1 is similar to the processor used by the Arduino community plus a Power Stage Controller.

-AC_Hacker

jrandom_EE · 07-17-10, 07:48 PM

Sorry AC Hacker, I'm not familiar with US wiring, so I wouldn't want to speculate on how to wire it up correctly. I'm also not really a power EE, and haven't done anything in that area since university anyway. I'd be just googling the same as you.

Xringer · 07-17-10, 08:26 PM

There is some stuff around on the web.. Is there a switch in that fan unit?
One that opens, when the fan motor starts running?

I had one of those flying balls centrifugal gizmos on an old oil burner motor once.
It broke one night at 3AM.. I drilled two small holes in some spring thing that held
one of the weights and tied them together with a paper clip..
It worked for years, until the system was replaced..

Connecting the CSIR Motor for a Change of Rotation

http://i110.photobucket.com/albums/n...ack/baldor.jpg

http://img.photobucket.com/albums/v4...nut/SBLMTR.jpg

igor.chudov.com/manuals/ElectricMotors.pdf

AC_Hacker · 07-18-10, 09:12 AM

Quote:

Originally Posted by jrandom_EE

...I'm not familiar with US wiring...

jrandom,

This is actually a euro-fan. Made in Italy I suspect and sold all over Europe and apparently also sold in the US.

So your knowledge might be relevant.

-AC_Hacker

AC_Hacker · 07-18-10, 09:14 AM

Quote:

Originally Posted by Xringer

... and tied them together with a paper clip...

Xringer,

Thanks for the links.

I'll check them out.

-AC_Hacker

laderload · 09-02-10, 12:58 PM

Hi,

i am new to this great group and i would like to thank you all for your contributions and thoughtful work. also i did not find the usual off topic sliding on private or ego issues

thank you Dave Meinert for sharing your work and showing us that this is feasable and working.

i am going to start building these weeks and would like to ask if any of the "plastic " versions have been finished and are working?

is there anyone who tried the metal version in comparison?

also, did someone experiment with the old AC/dehumidifiers (the surface is great, but just not even for both streams, due to the water-air mechanism )?

thank you very much for your help

laderload

Piwoslaw · 09-02-10, 01:57 PM

Quote:

Originally Posted by laderload

Hi,

i am new to this great group and i would like to thank you all for your contributions and thoughtful work.

Welcome to EcoRenovator. Please drop a few lines about yourself and your planned and finished projects in the Introductions section.

Quote:

Originally Posted by laderload

also i did not find the usual off topic sliding on private or ego issues

Welcome to EcoRenovator

AC_Hacker · 09-02-10, 03:35 PM

Quote:

Originally Posted by laderload

i am going to start building these weeks and would like to ask if any of the "plastic " versions have been finished and are working?

My plastic version is on hold due to other projects.

-AC_Hacker

07-14-10, 03:49 PM	#93
AC_Hacker Supreme EcoRenovator Join Date: Mar 2009 Location: Portland, OR Posts: 4,004 Thanks: 303 Thanked 723 Times in 534 Posts	Brushless DC Motor Control using ATmega32M1 Quite by accident, I came across this app note: Brushless DC Motor Control using ATmega32M1 Looks like the ATmega32M1 is similar to the processor used by the Arduino community plus a Power Stage Controller. -AC_Hacker Attached Thumbnails

07-17-10, 07:48 PM	#94
jrandom_EE Lurking Renovator Join Date: Jun 2010 Posts: 4 Thanks: 0 Thanked 1 Time in 1 Post	Sorry AC Hacker, I'm not familiar with US wiring, so I wouldn't want to speculate on how to wire it up correctly. I'm also not really a power EE, and haven't done anything in that area since university anyway. I'd be just googling the same as you.

07-17-10, 08:26 PM	#95
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	There is some stuff around on the web.. Is there a switch in that fan unit? One that opens, when the fan motor starts running? I had one of those flying balls centrifugal gizmos on an old oil burner motor once. It broke one night at 3AM.. I drilled two small holes in some spring thing that held one of the weights and tied them together with a paper clip.. It worked for years, until the system was replaced.. Connecting the CSIR Motor for a Change of Rotation http://i110.photobucket.com/albums/n...ack/baldor.jpg http://img.photobucket.com/albums/v4...nut/SBLMTR.jpg igor.chudov.com/manuals/ElectricMotors.pdf

09-02-10, 12:58 PM	#98
laderload Lurking Renovator Join Date: Sep 2010 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	Hi, i am new to this great group and i would like to thank you all for your contributions and thoughtful work. also i did not find the usual off topic sliding on private or ego issues thank you Dave Meinert for sharing your work and showing us that this is feasable and working. i am going to start building these weeks and would like to ask if any of the "plastic " versions have been finished and are working? is there anyone who tried the metal version in comparison? also, did someone experiment with the old AC/dehumidifiers (the surface is great, but just not even for both streams, due to the water-air mechanism )? thank you very much for your help laderload