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-   -   Home A/C a-coil for a air compressor air dryer? (http://www.hotrodders.com/forum/home-c-coil-air-compressor-air-dryer-227480.html)

kevs79 12-22-2012 11:45 PM

Home A/C a-coil for a air compressor air dryer?
 
I have been reading it is a good idea to cool the air coming from the pump before it goes to the tank and have a water trap after the cooler. Alot of guys have used an automotive evaporator or condenser to cool the air. I have an old a-coil from home unit and was thinking of using it. I was going to plumb it between the pump and tank and have a water trap before it goes into the tank. Also would add a fan to blow into the a-coil just like your furnace does to dissipate the heat. Of course I would have to eliminate the expansion valve on the a-coil to remove that restriction.
Any thoughts?

joe_padavano 12-23-2012 08:29 AM

Quote:

Originally Posted by kevs79 (Post 1626083)
I have been reading it is a good idea to cool the air coming from the pump before it goes to the tank and have a water trap after the cooler. Alot of guys have used an automotive evaporator or condenser to cool the air. I have an old a-coil from home unit and was thinking of using it. I was going to plumb it between the pump and tank and have a water trap before it goes into the tank. Also would add a fan to blow into the a-coil just like your furnace does to dissipate the heat. Of course I would have to eliminate the expansion valve on the a-coil to remove that restriction.
Any thoughts?

The only things I can think of are 1) be sure the coil is internally clean and 2) what's the tube size? If it's too small, it could be a restriction to flow rate.

John long 12-23-2012 08:43 AM

Is the A coil the condenser or the evaporator? I would think the condenser would be more effective though either would be an improvement. You will also need a catch tank for the water that will condense out as the air cools.

John L

kevs79 12-23-2012 08:50 AM

As far as restrictions go, it looks to be ok. It has a 3/8(I think) small line going in and that splits off into smaller 1/4(I think) lines an goes into the core.
The a-coil is the evaporator portion that is in the house above the furnace fan. The condensor is the part outside and would be way too big to mount anywhere. I have that unit also and was going to scrap it.

John long 12-23-2012 09:38 AM

Of course you are right. I engaged my typing finger before I put my brain in gear. I was thinking of automotive unit. I would think the home evaporator would work great. You would need to have a small tank to catch the water before it got to your compressor tank but that should not be too hard to find either. This is something I have also wanted to do. I hope you will post your progress along with a few pictures as you go. Good luck.

John L

kevs79 12-24-2012 04:26 PM

The more I think about it the more i am leaning towards a trans cooler or condensor from a car/truck. The a-coil is so big and takes up alot of room I don't have. I can pick up a trans cooler from the local pick n pull for 10.00 and it would be small enough that it would not take up much room.
I am thinking going up the wall from my compressor to the cooler, then out of the cooler down to a tee w/a leg w/a drain at the end, then back to the tank.

John long 12-24-2012 07:17 PM

Quote:

Originally Posted by kevs79 (Post 1626637)
The more I think about it the more i am leaning towards a trans cooler or condensor from a car/truck. The a-coil is so big and takes up alot of room I don't have. I can pick up a trans cooler from the local pick n pull for 10.00 and it would be small enough that it would not take up much room.
I am thinking going up the wall from my compressor to the cooler, then out of the cooler down to a tee w/a leg w/a drain at the end, then back to the tank.

That will work but I think you may get more water than you think. I would be tempted to pick up a 10 gallon air tank and run through it to catch the condensation.

Please let us know how it works out.

John L

Old Fool 12-26-2012 05:10 AM

Make sure you wash it out real good, a/c or transcooler. They both have had oil in them.

BWS 12-28-2012 06:27 AM

2 Attachment(s)
Got a new camera,see if this works.One is the "infamous" Franzinator....with external cooling coil(total loss system,IOWs 1/4" tubing taps into water supply but instead of tying back in,it simply fills a bucket.Only use this when AC is runnin non-stop.....and the water is simply adj to dribble).

The other pic is a copper coil.Its 3/4 that was simply coiled around a big sander drum or sumthing?Anyway its gonna be installed after comp.....

I need to tig up another expansion chamber on comp outlet...then plumb the above coil in....just need the time to do it....duh.

Good luck with your system.

John long 12-28-2012 08:45 AM

Quote:

Originally Posted by Old Fool (Post 1627077)
Make sure you wash it out real good, a/c or transcooler. They both have had oil in them.

How much pressure is a trans cooler designed to handle?

John L

66GMC 12-31-2012 05:13 PM

http://www.hotrodders.com/journal_ph...2800750910.jpg

This is what I made, and it seems to work very well.
Yes it has ball valves on every vertical drop.

Very little moisture ever makes it to the water trap.

41 kustom 01-06-2013 10:58 AM

Air
 
I did one just like yours 66. I can run my blasting cabinate now that I did. It works great at a good cost.

kevs79 01-06-2013 09:28 PM

Quote:

Originally Posted by 66GMC (Post 1629191)

This is what I made, and it seems to work very well.
Yes it has ball valves on every vertical drop.

Very little moisture ever makes it to the water trap.

Is that 1/2 copper tubing? Are there 4 valves on the wall(1 in each "u" and 1 on each drop at each end?

66GMC 01-07-2013 11:23 AM

Quote:

Originally Posted by kevs79 (Post 1631615)
Is that 1/2 copper tubing? Are there 4 valves on the wall(1 in each "u" and 1 on each drop at each end?

Yes, you're correct on both counts.
http://www.google.ca/url?source=imgl...N6x-mG8oSf_6CA
I used (expensive) ball valves like these ones on each of those 4 locations, and came up with a conglomeration of sweat-on fittings (don't trust compression fittings with 125 PSI) with swivels to allow for dissasembly if needed.
I pretty much cleaned out the local plumbing supply ... :thumbup:

http://s7d5.scene7.com/is/image/Cana...ge=image_na_EN

http://www.google.ca/url?source=imgl...6_UVODOWbZ2wmg
http://s7d5.scene7.com/is/image/Cana...ge=image_na_EN

http://s7d5.scene7.com/is/image/Cana...ge=image_na_EN

http://s7d5.scene7.com/is/image/Cana...ge=image_na_EN

http://www.shoptoit.ca/images/detail...0/81667658.jpg

A little later on, I found some sweat-on mini valves and used them for the outlet drops. Yes, every outlet has a drop and a ball valve so that moisture can be ejected.

Maybe I'll take some more pics after I clean up my messy garage. LOL

66GMC 01-07-2013 12:52 PM

http://www.hotrodders.com/journal_ph...3575877122.jpg
I've just added this, and a few more pics of this to my project journal.


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