Reply by OSU55

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Posted on Air Compressor filter/regulator & LVLP setup

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2658 posts in 2877 days

#1 posted 02-23-2017 12:52 PM

The compressor I have has finned copper lines going from the pump heads to the tank. I assume this is to help dissipate heat? Yes

If the air is cooled as it is entering the tank does that help with regard to reducing moisture content? Yes

My guess is that it’s sort of a closed system past the pump head….right? Yes

Any moisture in the compressed air is still going to be there even if it is cooled. No. As the air is cooled water vapor condenses and falls out of the air as liquid. This is how water gets in the air tank and needs to be drained.

Maybe the cooling helps reduce pressure so that the pump doesn’t have to work so hard? No. More heat transfer occurs the larger the temperature differential. As air is compressed it heats up (heat of compression) and friction of the compressor moving parts adds heat, The air is hottest at the compressor discharge and in the pipe going to the tank. The finning increases the hot surface area (another major player in heat transfer) and increases heat dissipation. Once the hot air gets to the tank it mixes with cooler air, and the lower temperature of the air reduces heat transfer. It’s also expensive to fin the air tank.

Air will “hold” more moisture with temperature, and less moisture with pressure. The compressor adds pressure but also heat, then the air cools in the tank and moisture “falls out” as liquid water in the tank, which then needs to be periodically drained.

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