Seems to me the same effect could be had by whirlpooling with a CFC for the first few minutes...I can output 50-60 degree wort from the CFC, colder if I wanted to prechill the cooling water...every gallon of 60 degree wort going back in to the kettle via the whirlpool would create 2 couple of gallons of 120ish, which would so by the time half the kettle is recirculated the temp would be down around 120, probably below 100 given the constant sliding scale you'd be dealing with, as the kettle cools coming out colder still at the cfc.
Might be worth building the recirculate arm to see how it would work.
I've done a little recirculating while cooling a couple of times, but only cowboy style with the hose run back in to the kettle.
Reading the article more closely, he does mention using a CFC / whirlpool combo but claims you can't hit exact temps with a cfc...I beg to differ. If you control your water output flow rate, as well as your wort input flow rate, you can nail any temp you want, right down to your water input temp. If you need a lower than source water final temp, then you can do as he suggests and pre-chill your cooling water with ice or even a combo of ice and rock salt. You dotn't even need a pump for your cooling water that has been pre-chilled if you have a keg or two to spare.
Regardless, what he's doing clearly does work, I just think that his claims about CFC's or Plate Chillers is off base.
After the MO is over, I'll look at a little build and demonstrate to see if I'm right.
JQ
