I am honing my equipment profile and getting the Brewhouse efficiencies up. After reading several articles on batch sparging, what I am trying to do is do a two stage batch sparge with equal quantities out of the mash tun, each equal to half the pre-boil volume.
eg: My current recipe has 7.2 gallons into the kettle so I expect to get 3.6 gallons out after the mash and then put another 3.6 gallons into the mash tun to yield a total of 7.2.
I have the mash profile set in BeerSmith to Single infusion, No mash out and the three batch sparge options boxes ticked (Use equal batch sizes, Sparge using batches that fill 100% and Drain mash tun before sparging.)
Beersmith is telling me to mash in with 4.7 gallons which sounds correct given the grain bill size and assuming 0.1gallon/Lb of absorption that should yield exactly 3.6 gallons which is half the pre-boil volume. The problem is that it then tells me to batch sparge with another 4.7 gallons. Since here is little to no absorption after the mash, that will yield an extra 1.1 gallons of wort. I was expecting that figure to be 3.6 gallons.
Am I missing something here? I have tried un-checking the 'Batch sparge using equal volumes' checkbox but I get the same results. It's not a big issue but in every other respect the Beersmith numbers are spot on. I am just trying to gain confidence in the calculations and according to the experts (Denny Conn being one), optimal efficiency is achieved with equal runnings out of the mash tun.
Thanks,
Paul
eg: My current recipe has 7.2 gallons into the kettle so I expect to get 3.6 gallons out after the mash and then put another 3.6 gallons into the mash tun to yield a total of 7.2.
I have the mash profile set in BeerSmith to Single infusion, No mash out and the three batch sparge options boxes ticked (Use equal batch sizes, Sparge using batches that fill 100% and Drain mash tun before sparging.)
Beersmith is telling me to mash in with 4.7 gallons which sounds correct given the grain bill size and assuming 0.1gallon/Lb of absorption that should yield exactly 3.6 gallons which is half the pre-boil volume. The problem is that it then tells me to batch sparge with another 4.7 gallons. Since here is little to no absorption after the mash, that will yield an extra 1.1 gallons of wort. I was expecting that figure to be 3.6 gallons.
Am I missing something here? I have tried un-checking the 'Batch sparge using equal volumes' checkbox but I get the same results. It's not a big issue but in every other respect the Beersmith numbers are spot on. I am just trying to gain confidence in the calculations and according to the experts (Denny Conn being one), optimal efficiency is achieved with equal runnings out of the mash tun.
Thanks,
Paul