So what you lose is efficiency, because it will take compressing more intake air to get the same yield of compressed air at a certain pressure/dewpoint.
(this is why you often see a lot of wet storage tanks for air - leaving it in the tank lets a lot of the intake air water condense at the bottom)
Aftercoolers remove a ton of of the water, and so you often get an 20 degree approach temperature.
Removing more than that requires some form of air dryer.
Yeah, I was wondering about that too. But is the water going to be there permanently?
If the input air is quite dry, presumably (total guess) it would pick up some extra water. So you'd need to supply more. And probably not just tap water because of dissolved minerals and so forth - distilled seems like a better idea.
Conversely if the input air is humid, you might end up condensing water out of it, and need to bleed water from the system.
And then you're dissolving particulates in it either way...
All sounds like maintenance work, but maybe not a prohibitive amount of it.
Its also not just water that is collected at the bottom of the air tank, compressor oil also collects. Oil can also be deliberately added by either as a byproduct of compressor design or from separate equipment, into the airstream help lubricate and protect equipment from the moisture, reducing the need to remove the moisture through other means.
One of the devices stopped working between services and the bottom reciever tank half filled with water.
Edit: they're call bleed valves
But 7 bar is ~7 times as much air per cubic centimeter, so that's 14% as much space containing 33% as much water. The partial pressure doesn't drop at a 1:1 ratio.
As a former owner of many water management devices from pet fountains to humidifiers to dehumidifiers, I'm more concerned about the fact that air is full of particulates, and you're going to wash the particulates through a fluid that stays in the pump permanently, so how quickly is the funk going to make that compressor unpleasant to be around?