prankster1590
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- Sep 24, 2019
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I was planning on doing a double decoction as experiment. The information about getting the right volumes is a littlebit flimsy. I chose for the following equation.
Vd = volume of decoction
Vm = Total volume of mash
Tt = target temp
T0 = start temp
Tb = temp boiling
a = temp lost during transfer of boiling water to mashtun and warming up the mashtun
But the advice is to use a 1,25 qts/ib water to grist in a decoction. This equation might work for this water to grist ratio but if you would use a ratio of 2,5 qts/ib it would be a different mix with more water which needs a lot of energy to be warmer up. So you would underestimate the volume of boiling decoction to add back to the mashtun. In that case i would have to add coldwater to the mashtun to cool it down. But this means less spargewater. I could adept the a factor in the equation but this would need some trials to estimate the a factor.
So does this make sense? Is there an equation that als includes the water to grist ratio?
Vd = volume of decoction
Vm = Total volume of mash
Tt = target temp
T0 = start temp
Tb = temp boiling
a = temp lost during transfer of boiling water to mashtun and warming up the mashtun
But the advice is to use a 1,25 qts/ib water to grist in a decoction. This equation might work for this water to grist ratio but if you would use a ratio of 2,5 qts/ib it would be a different mix with more water which needs a lot of energy to be warmer up. So you would underestimate the volume of boiling decoction to add back to the mashtun. In that case i would have to add coldwater to the mashtun to cool it down. But this means less spargewater. I could adept the a factor in the equation but this would need some trials to estimate the a factor.
So does this make sense? Is there an equation that als includes the water to grist ratio?