Originally Posted by Chips
Well I've searched the forums far and wide but have had a hard time finding a calculator that will help me figure out my total mash volume.
Basically, I'd like to be able to enter the amount of water in my mash tun and the amount of grains. The calculator would then spit out the total volume.
It'd also be nice to know what volume would be left over after I remove the grains (using a BIAB system) but the first calculation is the most important.
Any links or formulas would be greatly appreciated!
I've been kicking around BiaB recently too, here's how I've been thinking it through (giving it a go this weekend, we'll see how it turns out):
For total volume, you need to figure grain absorption. According to the Aussies I've been reading that's 0.5-0.75 l/kg = 0.5-0.75 l/kg * (1.057 qt/l)*(0.453 kg/lb) = 0.5-0.75*0.48 qt/lb = 0.24-0.36 qt/lb grain absorption.
Now plug your grain weight into the calculator
with a mash thickness in that range. This gives a grain + absorbed water volume.
Add your batch size
Add boil off
Add some for trub loss
That's the total volume in your mash.
For total water, figure the water for grain absorption then add the three items above.
From everything I've been reading, the only fixed quantity here is the batch size...everything else is based on experience in your system. Hope that helps, and if anybody notes any flaws with that I'm sure they won't hesitate to point them out