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Hazmatt_(The Underdog)

Tue Dec 11 2007, 06:57AM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

If you do construct it as your diagram is drawn, you will have a very difficult time cleaning your grid. Your construction will have to bare this in mind.

Since you are designing a Precipitator, you could go this route, or your could also make a cylindrical mesh around a central electrode whereby you wipe down the outer mesh when its covered in dirt. I would orient the cylinder in the same direction so that your airflow passes through the whole grid.
You could also probably get by with 5-10kv insted of using higher voltages since you don't want to produce much Ozone.

...

Tue Dec 11 2007, 03:21PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

That drawing is pretty much dead on, but there are usually more fins (they are spaced with about 1/4" between them). The number of wires looks about right.

To make the fins cleanable, just mount a piece of metal on the top/bottom, so that the assembly can slide in/ount. Then you just rinse if off in your sink (or dishwasher if you are brave) and let dry.

Marko

Tue Dec 11 2007, 07:49PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Funny about those 'air ionisers' people build consisting of needle arrays sometimes blown over by a fan. I guess those are pretty much useless.

WaveRider

Wed Dec 12 2007, 07:23PM

Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500

Wow! This is a great discussion. It has been a while since I looked at my "cardboard-box" precipitator experiment. Ozone was a problem... I would like to try the ideas presented here...if they can reduce the ozone production while permitting enough ion current for good precipitation...

Is there a reference for the Honeywell structure?

Cheers!

CT2

Wed Dec 19 2007, 11:27PM

Registered Member #180 Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187

I was busy with exams last week but now im on christmas break, whoo hoo! So I started on the new design, went to home depot and got some parts, and then built this.

[

The fins are aluminum sheet metal, just scored it with an exacto knife and folded it to break it. I cut some plexy and used the threaded rod to make the holder. The whole "module" is 8 inches long and fits perfectly inside the top air channel, I would've liked more fins but I ran out of the metal so 4 will have to do. It is easy to remove for cleaning and can be rinsed in the sink, nothing should rust.

I also started on the wires to ionize the air, I'm using 14 AWG wire to attach the thin 36 AWG wire, only problem is as soon as I get 5 of the 6 wires done, they start to break. I have yet to get all wires soldered, I guess 36 is too small, what would you suggest as the best AWG wire for this? Or even a better way to mount these wires?

...

Thu Dec 20 2007, 01:18AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

The ones I have use a fairly heavy duty wire, on the order of 24awg. The wires aren't soldered in, but rather they have a look on the end the hooks up to a spring to keep them tensioned/easily replaceable.

Also, I forgot to mention... The wires have a secondary set of plates running between them ( 1 plate on either side of the wire) to help suck those electrons off the wire. You might want to find a way to add a set of grounded plates ~1" deep between each of the wires.

CT2

Thu Dec 20 2007, 07:01AM

Registered Member #180 Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187

I was actually going to use springs to hold the wires, when I was at home depot they had a whole bunch of springs but they were all too long. If I used a spring there would only be like 3" of wire as opposed to 4.5". I don't really get what you mean about the plates, your saying to put grounded metal plates like this?

...

Thu Dec 20 2007, 03:26PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

Here is a pic of the thing (hehe, need to be cleaned...)

You can see the ion spraying wires, with a plate between each one, and then the bank of precipitation plates behind it. IIRC, it ran off 20-30kv

CT2

Thu Dec 20 2007, 05:39PM

Registered Member #180 Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187

Ahhhhh I see... damn I need more plates haha, I guess I'll only have like 3 HV wires. The box is only 5 inches deep so there isn't alot of room, especially for grounded metal and high voltage. I'll see what I can come up with, I think I'll try and use springs because soldering isn't working. How crucial are those plates between the wires?

...

Fri Dec 21 2007, 12:47AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

I really don't know how much of an effect those plates have on things, you could probably just rig a little piece of Al foil next to the wires and see if it makes any difference.

I was thinking about the tensioning of the wire, could you just use 1 wire and thread it through a plate on the top/bottom. Then you would only need 1 spring (which could probably be rigged with just a piece of heavy copper wire).

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