cha ngo
Well-Known Member
Hello,
I have been doing fly-sparge AG brewing a while now and tomorrow I am giving batch sparging a go. This is in the hope of saving time. Currently a brew day for me and my buddy is a good 8 hours plus doing back-to-back ten gallon batches (overlapping some operations to decrease the total amount of time). My hope is to knock this down to around 5 hours. We plan on doing one humongous mash with a full 56 lbs of grain and batch sparging into two keggles.
I think I have the water amounts down properly, but am hoping one of you big-brain batch sparging gurus will double check me on it. Here is the spreadsheet:
23.00 Vb = total volume to be sparged to boiler (gal)
0.13 Ra = absorption rate of the grain (gal/lbs) (note: 0.13 is a good approximation)
0.31 Mt = mash thickness during conversion (gal/lbs)
56.00 Wn = weight of grain of the standard recipe (lbs)
20.00 Vr: Recipe Volume (gal)
76.00 Gr: recipe Gravity (gravity points, i.e. 1.046 = 46)
0.30 "R", the required mash thickness at runoff (gal/lb)
1.00 "S", the grain scale-up factor
56.00 "Wg", the total weight of grain needed for the batch-sparge version (lbs)
17.36 "Mv", Volume of mash water for conversion (gal)
-0.80 "Av", Addition volume of water needed to bring to first runoff volume (gal)
16.56 "Vm", the total volume of mash water that has been added to achieve "R" at the first runoff (gal)
11.50 "V1", the first runoff volume (gal)
80.94 "G1", the gravity of the first runoff
11.50 "Vs", the required volume of "sparge" water (if batch-sparge brewing)
40.37 "G2", the second runoff gravity (if batch-sparge brewing)
21.04 "Vt", the total mash-tun capacity required to hold all the grain and water (gal)
I get a little concerned because the amount of water to add to the mash for the first running is a negative number!? Is this normal?
I have been doing fly-sparge AG brewing a while now and tomorrow I am giving batch sparging a go. This is in the hope of saving time. Currently a brew day for me and my buddy is a good 8 hours plus doing back-to-back ten gallon batches (overlapping some operations to decrease the total amount of time). My hope is to knock this down to around 5 hours. We plan on doing one humongous mash with a full 56 lbs of grain and batch sparging into two keggles.
I think I have the water amounts down properly, but am hoping one of you big-brain batch sparging gurus will double check me on it. Here is the spreadsheet:
23.00 Vb = total volume to be sparged to boiler (gal)
0.13 Ra = absorption rate of the grain (gal/lbs) (note: 0.13 is a good approximation)
0.31 Mt = mash thickness during conversion (gal/lbs)
56.00 Wn = weight of grain of the standard recipe (lbs)
20.00 Vr: Recipe Volume (gal)
76.00 Gr: recipe Gravity (gravity points, i.e. 1.046 = 46)
0.30 "R", the required mash thickness at runoff (gal/lb)
1.00 "S", the grain scale-up factor
56.00 "Wg", the total weight of grain needed for the batch-sparge version (lbs)
17.36 "Mv", Volume of mash water for conversion (gal)
-0.80 "Av", Addition volume of water needed to bring to first runoff volume (gal)
16.56 "Vm", the total volume of mash water that has been added to achieve "R" at the first runoff (gal)
11.50 "V1", the first runoff volume (gal)
80.94 "G1", the gravity of the first runoff
11.50 "Vs", the required volume of "sparge" water (if batch-sparge brewing)
40.37 "G2", the second runoff gravity (if batch-sparge brewing)
21.04 "Vt", the total mash-tun capacity required to hold all the grain and water (gal)
I get a little concerned because the amount of water to add to the mash for the first running is a negative number!? Is this normal?