Hi - I've started using some new equipment, and had some unexpected numbers on my last brew, so I'm trying to dig into the math a bit.
Total Mash Water: 10.13 gal @ 157 F
Grain: 12.24 lb
Grain Absorption: set @ 0.85 fl oz/oz ==> 1.30 gal
BeerSmith tells me that the water available from the mash should be 8.82 gallons - which makes sense I think @ mash temperature (10.13 gal - 1.30 gal = 8.83 gal).
If I take the 8.82 post mash number and adjust it for temperature, I calculate 8.82 gal * (8.17 lb/gal @ 155 / 8.00 lb/gal @ 212) = 9.01 gal preboil.
But then my estimated pre-boil volume is also 8.82 gal. I would have thought that this would have been at boiling temperatures, as the math for boiloff and cooling shrinkage seems to work out exactly.
Ultimately I'm trying to back-calculate a measured grain absorption so that I can adjust, but the temperatures for the volumes have me scratching my head as well.
Can anyone point me in the right direction here?
I've looked through the documentation and forum and had trouble finding an answer. Thanks.
Total Mash Water: 10.13 gal @ 157 F
Grain: 12.24 lb
Grain Absorption: set @ 0.85 fl oz/oz ==> 1.30 gal
BeerSmith tells me that the water available from the mash should be 8.82 gallons - which makes sense I think @ mash temperature (10.13 gal - 1.30 gal = 8.83 gal).
If I take the 8.82 post mash number and adjust it for temperature, I calculate 8.82 gal * (8.17 lb/gal @ 155 / 8.00 lb/gal @ 212) = 9.01 gal preboil.
But then my estimated pre-boil volume is also 8.82 gal. I would have thought that this would have been at boiling temperatures, as the math for boiloff and cooling shrinkage seems to work out exactly.
Ultimately I'm trying to back-calculate a measured grain absorption so that I can adjust, but the temperatures for the volumes have me scratching my head as well.
Can anyone point me in the right direction here?
- Is the "Water Available from Mash" field @ mash temperature?
- Is the "Estimated Pre-Boil Volume" field @ boiling temperature?
- What measurements (at what temperatures) do I need to calculate actual grain absorption?
I've looked through the documentation and forum and had trouble finding an answer. Thanks.