Water as a coolant in compressors

Hey all. Been reading and learning a lot about compressors. Heat seems to be the major concern with these units. In all my reading of those that use water as a coolant medium, I've seen no mention of adding a surfactant to the water. Is no one using a surfactant? Why not?

I can see why you wouldn't if you have a system, like I read about recently, that you run an intake line from one side of a filled kitchen sink and the out put line to the other side of the sink. But running surfactant treated distilled water would transfer and carry the most heat away from a compressors internals, in a closed system. Or even, if you were using a 5 gallon bucket as your coolant reservoir. I think, in that scenario, I'd have a dedicated bucket with treated distilled water that was only used for that purpose. After use, put the lid on the bucket and save it for next time.

A surfactant breaks down the surface tension of water and allows it to coat the surfaces it's in contact with much better than water alone. Adding it to water that is used to cool, pick up and transfer heat away from an air compressors internals seems a no-brainer.

I've used one for years, in everything that uses water as a coolant. Works wonderful in keeping my big bore 2 stroke water cooled dirtbike engine in check. My surfactant of choice is Red Line Watter Wetter. Can be had at several different automotive stores. One bottle will treat everything you have that's water cooled.

With all the posts I see of folks giving the temperature readings they're seeing from their compressors, I'd be interested to see some folks do a temp readings comparison test, with and without surfactant treatment.

Thoughts?
 
Recently read of a question asking about using an automotive coolant (read anti-freeze) in compressors. Plain water has better cooling properties than anti-freeze. Anti-freeze is meant to prevent water left in a cooling jacket from freezing and the damaging effects of that. So unless your compressor retains water in the system after use and it's stored in freezing temps, I would say no to using it.

Anti-freeze also has lubricating properties for seals and such. So does the surfactant I mentioned above.

 
Some interesting things I have seen and read about. My Omega Turbo 2 compressor specifically stated not to use DI water. Also I run the pump system until the compressor outlet air temp is back down to ambient room temp. No issues so far and I fill a Great White portable tank frequently and I have two large steel tanks that about 4.5 ft high (don't know the cubic ft size) without any issues. I added the purple ice and antifreeze as recommend by the manual to the bottled drinking water in the system. 
 
I would not use DI water in your system at all. Water likes to have lots of ions in it and removing them means it will go and grab ions from the metal surfaces it comes in contact with which in the case of the YH means the aluminum cylinder block and walls. I had a student once use DI water in one of the 4.5kW Neslab recirculating chillers in lab - he thought distilled water was the same as DI water and used it instead. Changed it every 6 months with a fresh batch and I never knew it. Until one day he asked me why the chiller wasn't chilling. We emptied the water to replace it (which is how I realized he was using DI water instead of distilled) and it was yellow-green - the DI water had corroded the copper heat exchange coils to the point where pinholes had opened up in the copper tubing, letting refrigerant out into the chilled water loop (and yes, into the machines).

I recommend using distilled water or even tap water - a surfactant certainly doesn't hurt and neither does an algacide. But honestly, there isn't much surface area being cooled here - that's why I think the effect of the surfactant is probably minimal. There aren't any capillary side channels or fins or other sudden changes in cross-sectional area in the flow, nor are there any sharp corners or eddy points - I think it's mostly just straight circular channels. I haven't seen any difference with and without surfactant, though honestly haven't done any careful studies on it. Keeping the cooling channels straight and simple is probably why they don't work more effectively - but at this point I agree with that particular design decision because it saves on machine costs and probably avoids extra connectors and seals, and at least so far, it works fine for topping off a 6.8L tank from 3000psi to 4500psi. Just my $0.02.
 
"Hookster"Some interesting things I have seen and read about. My Omega Turbo 2 compressor specifically stated not to use DI water. Also I run the pump system until the compressor outlet air temp is back down to ambient room temp. No issues so far and I fill a Great White portable tank frequently and I have two large steel tanks that about 4.5 ft high (don't know the cubic ft size) without any issues. I added the purple ice and antifreeze as recommend by the manual to the bottled drinking water in the system.
I am looking forward to getting my Yong Heng compressor in the near future and want to set it up right. Can you tell me why using distilled water is not recommended for use. Bill
 
"prfssrlee"Trailfyder42 - I run a surfactant in mine, and also an algicide.Haven't noticed any difference in the system, but as you say, it certainly doesn't hurt any.
prfsslee can you tell me or provide a link to the algacide you are using. I was looking at algacides on Amazon for pools it they look mighty concentrated. I like the idea of not have to be constantly changing the water whether it is supposed to be bottled water or distilled. Bill
 
@Trailryder - You are right! That's why I told the story of my student who didn't realize there was such a huge difference between 14 MOhm water and distilled. As I suggested above, use distilled, not DI.

@AirgunBill - This is the bottle. If I remember, about $7 from the local Pet Supply store. Just a couple of drops so that's a lifetime supply right there.
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