Efficiency

[Big Monk]

What are some typical efficiencies for no sparge mashes that members here are experiencing?

[Techbrau]

For conversion, I get about 36-37 gravity points per pound of grain per gallon of water.

Losses in my system are about 0.1 gallons per pound of grain for absorption, and 0.12 gallons of deadspace in my mash tun.

I target a final volume post boil of 4 gallons and a boiloff of 10%. So given a desired OG, I work backwards and solve a little system of two equations to figure out how much grain and strike water I need to use. Efficiency goes down with increasing gravity in my system.

[Big Monk]

The reason I ask is because I typically have Mash Efficiency as a user inputted variable in my spreadsheet.

I recently coded in the following equation to try it out:

Conversion η*0.93*(Pre-boil Volume/(Pre-boil Volume + Absorption))

I'm assuming that given the no sparge and the higher water to grist ratio I can assume >= 95% conversion efficiency.

I'm going to try it out. Seems that 1.036-1.091 wort would yield ~62-78% Mash η. This seems a bit high to me but I have to forget my typical homebrew programming and realize that high conversion η combined with good extraction from recirculation doesn't put this outside the realm of possibility.

Obviously I'm just pencil whipping here but just wanted to get some advice/practical experience from you guys.

[Bryan R]

I get anywhere from 63-73% based of mash schedule and base malts( brewhouse). Always excellent conversion with the no sparge.(With decoction I saw as high as 108%)

[Big Monk]

[Brody]

Attached my efficiency calc from my last Helles

[Big Monk]

Thanks for that. It's nice to have another data point.

[Bryan R]

[Brody]

[Big Monk]

I don't planning on brewing anything bigger than a Doppelbock and Imperial Stout lager. I'm thinking 17-18 °P on those beers. Other than that it will be 13 °P or less.