Maybe this is a BeerSmith question, but I figured I'd toss it out here and see if anyone found a way to get these numbers closer - I hate having to use multiple tools.
However, BS2 knows how big the GF's capacity is (set at 29.9L in the included addon), so one would think it should be able to include that as part of the calculation. The GF numbers add up to much smaller total volumes than the BeerSmith numbers do, so perhaps that's the source of the problem. What I haven't been able to get is the difference between the Grainfather sparge calculator and the BeerSmith sparge calculator. For myself, I was able to follow some recommendations (like setting deadspace to 0) to get very close between predicted and actual. Those values were found by solving for dead space from knowing the mass of grain used and the mash/sparge water output. I also have seen several profiles floating around with varying levels of accuracy. Ive been messing with the grainfather website and something Ive noticed is that based on their 110v mash/sparge calculator the dead space in the tun is 0.914gal and the behind the scenes mash thickness is 1.297qts/.
For a 5kg grain bill, this is: (5 × 2.7) + 3. Because the RoboBrew and Grainfather have very similar dimensions, the physics of the recirculating mash are very similar. I know that BeerSmith2 has a Grainfather equipment profile plugin. Instructions for the Grainfather use a slightly more complicated formula.
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