Dirt cheap DIY shop air dryer set up. - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 02-07-2006, 12:34 AM
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That's cool. I have the same problem with my mickey mouse compressor I built using an old compressor out of a logging truck, and a 240 volt 2 hp fan motor I got for free.

I've got an condenser out of an old Ford air conditioner system. Do you guys think that would work? I hate paying for the disposable water filters at 10 bucks apiece when I use the spray gun, and still have to wrap a rag around the connector when I'm doing a hood. Drips of water really look like crap. I've had to redo 2 because of it (beginner).

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Old 02-07-2006, 04:35 AM
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Quote:
Originally Posted by oldred
First PUT A GUARD ON THAT FAN!
LOL...thats actually on my "to do" list. The first time I fired the compressor up the air flow grabbed a couple of small fan belts from a group of them I had hanging on a nail behind the compressor. Not only did it fling them across the garage it bent the aluminum blades of the fan bad enough I spent the next hour or so straightening them back out.
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  #18 (permalink)  
Old 02-10-2006, 04:14 PM
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Nice setup ! My compressor has a fan that pushes/pulls ? air over the compressor pump I wonder if that would be enough air movement to cool the air if it was you could mount the cooler in front of it how much air volume do you need ??? I suppose that depends on the size of the cooler .
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Old 02-11-2006, 05:36 PM
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Cool.

Now you've got me thinking about doing that kind of setup for myself.

One concern I have is the cfm loss due to the added restriction/friction.
I took fluid mechanics in school but that was 25 years ago.

I have a bead blaster and wouldn't want to degrade the air volume I need for that as well as my DA and other tools.

Anybody done the math on this for a home made system like the one shown?
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  #20 (permalink)  
Old 02-18-2006, 10:01 AM
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I think one reason this setup might be working so well is that it is cooling the air BEFORE entering the tank. Most folks seem to address condensation issues after the tank inline to the tools. Addressing it before entering the tank takes the air at its hottest point and immediately tries to remove some of the heat. The heat exchanger in this model (the tranny cooler and fan) is actually a pretty dang efficient model (admittedly, the air will generally be flowing through there faster than fluid). Have you checked the temperature diff (even with your hand) on the outlet hose form the compressor, as compared to the outlet from the cooler where it enters the tank? I would expect a significant temp difference on the order of 20 to 30 degrees.
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Old 02-24-2006, 01:41 AM
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Quote:
Originally Posted by cab
Have you checked the temperature diff (even with your hand) on the outlet hose form the compressor, as compared to the outlet from the cooler where it enters the tank? I would expect a significant temp difference on the order of 20 to 30 degrees.
Ive checked the in vs out temps with my hand and the inlet line gets too hot to touch right at the cooler inlet while the line on the outlet side is cool to the touch. The outlet line actually stays cold to the touch unless I run the compressor for extended periods when porting heads/sand blasting and such. Ive checked the cooler temps as well by putting my hand on the core then working my way acrosss it and found that the cooler itself is cool to the touch from about the middle all the way over to the side where the outlet is.

Hope that answers your questions or at least somewhat answers them.

jvsapp,

I havent forgotten about getting you those part numbers Ive just been REALLY busy with home projects (aka: wife is remodelling which means Im remodelling) but I will get them for you ASAP.
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Old 02-24-2006, 05:13 AM
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Another one

This guy built his own intercooled air compressor..seems to work for him..

OMT
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  #23 (permalink)  
Old 02-24-2006, 08:10 AM
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The guy that made that is named Tim. I used to sell him propane when I lived in Phoenix. He is a pretty cool guy. He has a fuel injection system that he made himself (built the computer from scratch) for his sand rail. Under boost it gives it alchohol for intercooling and extra fuel.

Its a small world

John
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Old 02-24-2006, 09:54 AM
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no problem man... i understand how the wife's work gotta come first sometimes...
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Old 02-24-2006, 08:30 PM
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Quote:
Originally Posted by OneMoreTime
This guy built his own intercooled air compressor..seems to work for him..

OMT
Thats pretty cool (no pun intended) and his set up turned out a whole lot nicer looking than mine.
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  #26 (permalink)  
Old 02-25-2006, 08:03 AM
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In the link provided by OMT, are those computer fans he is running? Where might one get their hands on similar units (cheap).

Also, I'm a little confused regarding the theory of these inter coolers. When the hot air produced by the compressor passes through the cooler, isn't there a ton of condensation produced? Am I wrong in assuming that most of the condensation that would normally occur along your hose and piping is now occurring in the inter cooler? And if that is the case, don't you have to drain down or get rid of all the condensed water from the cooler fairly frequently?

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  #27 (permalink)  
Old 02-25-2006, 10:30 AM
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Quote:
Originally Posted by cboy
In the link provided by OMT, are those computer fans he is running? Where might one get their hands on similar units (cheap).

Also, I'm a little confused regarding the theory of these inter coolers. When the hot air produced by the compressor passes through the cooler, isn't there a ton of condensation produced? Am I wrong in assuming that most of the condensation that would normally occur along your hose and piping is now occurring in the inter cooler? And if that is the case, don't you have to drain down or get rid of all the condensed water from the cooler fairly frequently?

Dewey
They sure do look like Pentium 4 processor cooling fans. I've seen them on page 363 in the
Princess Auto Surplus section of the catalog.

If you read the whole story on OMT's link, it does explain the theory rather well.

The gist of it (my understanding) is that removing the heat from the air allows the water to drop out before it enters the tank.

The air (containing atmosheric moisture) is very hot coming out of the compressor, and the water is in gaseous form (steam). Cooling the air allows the water to condense so that it can drop out at the first pressure drop, and can be ejected before even entering the tank.

Best of all, this guy has made the ejection of the accumulated moisture an automatic thing by tying the water trap to the unloader valve. Every time the compressor is shut off, the collected moisture is ejected.

Last edited by 66GMC; 02-25-2006 at 10:48 AM.
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  #28 (permalink)  
Old 02-25-2006, 12:16 PM
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Quote:
Originally Posted by 66GMC
Cooling the air allows the water to condense so that it can drop out at the first pressure drop, and can be ejected before even entering the tank.
Best of all, this guy has made the ejection of the accumulated moisture an automatic thing by tying the water trap to the unloader valve. .
Okay, I think I get it. The intercooler does still produce lots of condensation, I just didn't understand where it was going or how it was gotten rid of. Apparently it drips down from the "radiator" into the rather typical looking water separator (glass bottomed) valve. Then it is blown out through the unloader.

The intercooler doesn't prevent the condensation of water, instead it just insures that the condensation takes places at a more appropriate point in the system...and then gets rid of the excess water.
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  #29 (permalink)  
Old 02-25-2006, 03:34 PM
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The setup with the cpu fans has an unloader valve setup on it. When the air pressure gets to the the high setting it blows off a little air from the glass bowl deal, which blows out the water collected. Kinda like the way the big trucks are set up.
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Old 02-26-2006, 01:36 PM
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The idea behind cooling the air is so the water vapor (not steam) can condense into liquid droplets that can collect on cooler pipe walls and drain into collection "drops" or better still be piped into a separator where it will be forced to spin thus using centrifugal force to "sling" the condensed water out to be collected in the reservoir where it can then be drained. I personally prefer to cool the air and separate moisture down stream of the tank where it can be collected in a water separator instead of using the tank as a water trap, it will collect some water anyway but IMO the less water in the tank the better.
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