So somebody's not telling the full story. a - said he was getting 69% at a 1.075 brew. Since I'm feeling lazy and not wanting to put much extra brain power to it, what's the prediction on a 1.075 brew?
The only variable is the pre-boil volume. At 5.5 gal, it'll be ~66% efficiency. At 7.5 gal, it's ~76%. Since you aren't compounding it with a second batch, the range is really pretty small.
Just still not following, why would a 5.5 gallon batch of 1.075 have a 66% efficiency and a 7.5 gallon batch a 76% efficiency. Are you assuming using the same amount of grist or something and just adding more and more water?
Maybe I should have asked how long you cool cats boil...I mean we could add enough sparge water to turn it into a massive volume and extract nearly all the sugars and while that could be ran off in record time it would take forever to boil down to a manageable amount.
Somebody help me wrap my brain around all the stats for a 1.075 - 5 gallon finished batch size on a NO-SPARGE (meaning only drain the tun) which would have a 75% efficiency.
Grist is easy since I dictated 75% efficiency, ~13.9 lbs
Water absorption, let's assume 0.12 gal/lb = 1.67 gallons
(1.67 + additional water)
Final volume after runoff
(should equal additional water and the difference between that and 5 gallon will determine the boil time using whomever's system boil off rate)
(I keep seeing 90 min popping up)
Anything else pertinent I left out?