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I'm playing around with recovering heat from condenser water and I have a 3"x10" shotgun hooked up to the hot output from my 6"x48" product condenser. Hot water is going in the top of the 3"x10" and hot water is going out the bottom of the 3"x10". My fermented wash I'm trying to heat up goes in the bottom cold and comes out the top cold. The 3"x10" is extremely hot to the touch.
The 3"x10" seems to be doing next to nothing and I was thinking of getting a 3"x20" shotgun to it, but I'm concerned it will just end up doing twice next to nothing.
I'd really expect more heat exchange to be happening. Obviously the temp of the output wash is going to be highly dependent on the flow rate, but the fact that the condensing water still is blistering hot after leaving the 3"x10" is disappointing. Maybe a shotgun out of copper would be better, but copper is a PITA to keep clean.
I'm thinking a tube in tube heat exchanger might be another option but most of them are pretty ugly (rubber and copper) and not really well suited for hanging in the air.