This is going to be complicated but: if you combine a few ideas here you could have something interesting. Take the glycerol solution idea and run it through a counterflow chiller. If you could have that cold solution recirc through a refrigerator or freezer element you could be on to something.
I've seen pro breweries use liquid to air chillers. Pump hot wort through a radiator/heat exchanger with large fans mounted to it. Obviously this is less efficient since water > air but if the goal is to not run water then the best bet would be to recirc the wort through this type of chiller as fast as possible with a strong fan setup on each side of the exchanger in a push/pull.
Paterbiersbier (pils, special roast, caravienne, strisselspalt)
Originally Posted by GilaMinumBeer
Homebrewing as a way to save money is like getting married as a way to always have sex.