Originally Posted by timm747
Right, but then there's the argument that if the water moves to fast it isn't absorbing as much heat. There are discussions about this all over HBT and I have yet to see anything conclusive. All I know is it took 2 hours to cool it down when the pressure was up and I can cut that at least in half if not more by slowing it down. I'm not talking about a trickle. The water is still coming out pretty quick.
I won't beat a dead horse, so I'll just leave it with this: I can guarantee you'll never see a mathematical argument OR a controlled experiment showing that lower flow rates results in faster wort cooling. It's just not possible in this situation where we already have fully developed turbulent flow. Sure you may see pseudo-scientific comments like "the water doesn't have time to absorb the heat" but that's simply gibberish.
It's like trying to argue "my heating element puts out more heat when I use a lower current, because when the current is too high, the electrons don't have enough time to create heat." Also not correct.
As I'm sure we'd both agree, once you get a good flow rate, adding more water doesn't help much. For me 100% flow works hardly better than 50% flow because my cooling water comes out around the same temp at 100% versus 50% flow. So this discussion is largely academic anyway, since I'm sure you and I and everybody else runs enough water that we're all the way up that plateau.