Pre Boil Water vs Mash Guidelines

Discussion in 'Recipe Editor' started by Frankenbrewer, Jan 8, 2021.

  1. Frankenbrewer

    Frankenbrewer Well-Known Member

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    Since my equipment calcs the pre boli and post boil water amounts, how does this equate the amounts of water in the Mash Guidelines section? Example: In my Robobrew profile I listed 1.5qts/lb for mash. With a 10.5lb grain build that would mean approx. 4 gallons of strike water and roughly 2.8 gallons of sparge water. But after the calculated losses in the equipment profile, my pre boil water will be around 5 gallons. What am I missing? Is this why I am missing my gravity numbers? I hope this isn't too confusing. I cannot get the correct water volume and I'm thinking its because I dont understand the calcs. Help!!!!!!!
     
  2. Silver_Is_Money

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    #2 Silver_Is_Money, Jan 8, 2021
    Last edited: Jan 8, 2021
    Lets say you want to yield 5 gallons:

    10.5 Lbs. Grist x 0.12 = 1.26 gallons absorbed by the grist
    Boil Off = ~1.00 gallons
    Trub Loss = ~0.50 gallons (or perhaps a tad more)
    Additional Aggregate Unrecoverable System Losses Not related to Absorption or Trub or Boil-Off = U

    5 + 1.26 + 1.00 + 0.50 + U = Total Water Required

    Lets presume U = 0.33 gallons of aggregate (overall) unrecoverable system losses are inherent throughout your system and process.

    5 + 1.26 + 1.00 + 0.50 + 0.33 = Total Water Required
    Total Water Required = 8.09 gallons

    8.09 x 0.60 = 4.854 gallons of mash water
    8.09 x 0.40 = 3.236 gallons of sparge water
     
  3. Frankenbrewer

    Frankenbrewer Well-Known Member

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    I'll give it a try on my next batch. Thanks Silver!!
     
  4. Pricelessbrewing

    Pricelessbrewing QA Software Tester
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    Thanks for the quick reply @Silver_Is_Money. If you have any more questions @Frankenbrewer please don't hestitate to ask.

    We have a pretty big update still in the works for improving the mash guidelines, and QWR/volume calculations.
     
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  5. Silver_Is_Money

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    Remember that the 0.33 gallons figure for 'U' is purely hypothetical, and the true value of 'U' for your system and process must be assessed.
     

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