Unfortunately, that would be abysmal. (political statements aside...)
The problem lies in the amount of surface area for the airflow: as a round tube, it's about as small as it can be.
Also, if this is a straight copper pipe, meaning with nothing inside, then there's minimal turbulence of the water.
Now take a look at this guy's mounting posts: nice big aluminium pieces, which would be perfect to add surface area!!!
I'd try slipping in a string of turbulators inside the copper tubes, to disrupt the water flow, improving the heat transfer.
I've said it before, and I'll say it again, if anyone wants to go that route, start collecting cans of pop! You can cut them out to make very nice and effective fins to copper tubing.
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