First post. Looks like a comfortable place here.
On to the experiment: Chill 12 gallons of wort from boiling to 65F with as few gallons of water possible.
Method Using a recirc through my IC and a old wore out cooler-tun and frozen PET bottles.
Four gallons for the recirc and...
Five Blue packs
I figure all the above comes to around 85# ice equivalent. I'll refreeze everything except the recirc water.
The upside is that I save water usage- which can be considerable with an IC. Downside? Takes longer. I also had to resort to the blue paks at the very end. More like insurance since it was already below 70F. However, pitching temp for the S-04 ended up being 62F!
Preliminary conclusions: I would feel a little more comfortable with a couple extra 3L. Or I could waste a little water just dropping the wort down to 150F or so then do the recirc. That would shorten the duration as well.
This has real potential IMO