In a double coil, which coil is cold water in?

[jackspratski]

Should the cold water in go in the inner or outer coil?

Thanks

[Monkeyman88]

I could be wrong, but I don't think it matters with a double coil.

[jackspratski]

Can anyone else chime in? Doesn't matter?

[Yummyrum]

I dont think it matters a lot.I have mine however going into inner coil first because it worked better n my case with the coolant hose routing .
I think it might matter if the outer coil was touching the condenser housing and if there wasnt a gap between turns...but thats my gut feeling.
My dual coil condenser has had no problems fully refuxing up to 2200watts so I've never had need to investigate further

[still_stirrin]

OK jacksprat,

Vapor condenses on the surface of the coils, either inner or outer coil....or both.

In fact, the outer coil has more surface area than the inner coil, so it will cause greater mass of vapor to condense than the inner coil. But the outer coil will also heat up quicker for the same reason...it's pulling a proportionally greater amount of heat out of the vapor.

But the motive force for the heat transfer is the temperature difference. So, you want the cooling water temperature to always be less than the vapor temperature regardless whether it's the inner or outer coil.

Bottom line here...it doesn't matter if you run the cold water in the outer or the inner coil first as long as it exits below the hot vapor's temperature.

Adust the water flow rate so it pulls the most heat out that the coil can extract....size matters here!
ss

[masonsjax]

There was some test data posted in a thread about the corrugated SS tubing often used as condensers in the CCVM design. The results showed a huge difference in performance sending the water one way vs the other. I can't remember which was the more efficient direction though. I'll post a link if I can find it.

[Monkeyman88]

There was some test data posted in a thread about the corrugated SS tubing often used as condensers in the CCVM design. The results showed a huge difference in performance sending the water one way vs the other. I can't remember which was the more efficient direction though. I'll post a link if I can find it.

That was for a single coil. Using a single coil is different to a double. Better to have a single go in the top of the coil and out the straight line in the center.