prankster1590
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EDIT: WATERBILL IS WRONG. IGNORE PLEASE
When I calculate my hop additions I use Tinseth. When i add these number to the recipe calculator of brewers friend I always get a lower IBU than what I have calculated by hand.
For example. I wanna brew 20 liters of a lager kind of beer with 23 IBU's. The SG at 20 liters should be 1,0477 or about 124 g/L sugar. I'm gonna use Styrian gold (AA%=3%) as bitter for 60 minutes, East Kent gold (AA%=5%) as flavor for 30 minutes and Hallertau tradition (AA%=4,3%) for 5 minutes.
At the start of the boil I have 24,641 L water and at the end of the boil I have 22,916 L water (7% / hour evaporation rate).
For 60 minutes boiling I have a SG of 1,0337 and a U% of 26,7%
For 30 minutes boiling I have a SG of 1,0401 and a U% of 19,4%
For 5 minutes boiling I have a SG of 1,0414 and a U% of 5%
EDIT: THIS IS ALL WRONG. IGNORE PLEASE.
Tinseth equation I use.
U%= (1,65*0,000125^(sg-1))*((1-e^(-0,04*t(min))/4,15)
The weigh of the hops I have to add is calculated as follows with L being the intended end volume (20L):
W(grams) = (L*IBU)/(AA%*U%*10)
At 60 minutes before end of boiling I add 15,05 IBU of Styrian gold:
w =(20*15,05 )/(0,03*267) = 37,6 grams
At 30 minutes I add 6,37 IBU of East Kent gold
W = (20*6,37)/(0,05*194) = 13,13 grams
At 5 minutes I add 1,612 IBU of Hallertau tradition
W = (20*1,612)/(0,043*50) = 15 grams
15,05+6,37+1,612 = 23 IBU
And this is wat the recipe calculator give me. Only 21,5 IBU's. Why? Should be the same calculation.
When I calculate my hop additions I use Tinseth. When i add these number to the recipe calculator of brewers friend I always get a lower IBU than what I have calculated by hand.
For example. I wanna brew 20 liters of a lager kind of beer with 23 IBU's. The SG at 20 liters should be 1,0477 or about 124 g/L sugar. I'm gonna use Styrian gold (AA%=3%) as bitter for 60 minutes, East Kent gold (AA%=5%) as flavor for 30 minutes and Hallertau tradition (AA%=4,3%) for 5 minutes.
At the start of the boil I have 24,641 L water and at the end of the boil I have 22,916 L water (7% / hour evaporation rate).
For 60 minutes boiling I have a SG of 1,0337 and a U% of 26,7%
For 30 minutes boiling I have a SG of 1,0401 and a U% of 19,4%
For 5 minutes boiling I have a SG of 1,0414 and a U% of 5%
EDIT: THIS IS ALL WRONG. IGNORE PLEASE.
Tinseth equation I use.
U%= (1,65*0,000125^(sg-1))*((1-e^(-0,04*t(min))/4,15)
The weigh of the hops I have to add is calculated as follows with L being the intended end volume (20L):
W(grams) = (L*IBU)/(AA%*U%*10)
At 60 minutes before end of boiling I add 15,05 IBU of Styrian gold:
w =(20*15,05 )/(0,03*267) = 37,6 grams
At 30 minutes I add 6,37 IBU of East Kent gold
W = (20*6,37)/(0,05*194) = 13,13 grams
At 5 minutes I add 1,612 IBU of Hallertau tradition
W = (20*1,612)/(0,043*50) = 15 grams
15,05+6,37+1,612 = 23 IBU
And this is wat the recipe calculator give me. Only 21,5 IBU's. Why? Should be the same calculation.
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