Beer Smith trub loss and efficiency

[jtp137]

I understand that mash efficiency and brew house efficiency is different but i cant make sense of beer smith

I have a efficiency in beer smith of 70%. If my post boil volume is 6.5 gallons and I leave 1 gallon of trub in the kettle i will have 5.5 gallons in fermentor. Beer smith gives this an OG of 1.076

I dont really know if it will be an entire 1 gallon worth of trub in the kettle so i changed the trub loss to 0.5 gallons i kept the post boil amount the same so why did beersmith change the OG to 1.083 when I changed the trub loss to 0.5 gallons and the batch volume to 6 gallons

If my post boil is the same amount how does the OG change? I dont care how much I leave in the kettle the OG after boil should be the same


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[brewfun]

Mash efficiency is what makes it into the kettle. You're applying the rule that more volume = less OG. In that scenario, you're logic is sound.

BeerSmith uses brewhouse efficiency as a measure of how much sugar makes it into the fermenter and can become beer.

Based on your description, I'm not tracking with your results. To get close to the 1.083 gravity your reporting, I have to be at a 5 gallon batch with 0.5 gallons trub.

Changing to 0.5 trub and a 6 gallon yield predicts OG 1.070 because the Brewhouse efficiency is closer to the full kettle volume.