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Mash Temps in BeerSmith (for a Pale Ale recipe)

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idzy

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Not sure if this has been discussed before, but thought I would do some analysis on the impacts of temperature on a single infusion 75 minute mash.

It seems that Beersmith has some strange calculations:
Mash @ 62c 75 mins - ABV 5.0%
Mash @ 63c 75 mins - ABV 5.0%
Mash @ 64c 75 mins - ABV 5.5%
Mash @ 65c 75 mins - ABV 5.3%
Mash @ 66c 75 mins - ABV 5.2%
Mash @ 67c 75 mins - ABV 5.0%
Mash @ 68c 75 mins - ABV 4.9%
Mash @ 69c 75 mins - ABV 4.7%
Mash @ 70c 75 mins - ABV 4.6%
Mash @ 71c 75 mins - ABV 5.0%
Mash @ 72c 75 mins - ABV 5.0%

As you can see there is a massive jump between 63 and 64 in the calculations and 70 and 71.

I also noticed if I added 2 steps @ 62/64 for 38 mins, it would bump the ABV to 5.5%. I also noticed if I changed the steps from 38 mins to 5 mins, the ABV remained @ 5.5%.

Can anyone shed any light?
 

Black n Tan

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idzy said:
Not sure if this has been discussed before, but thought I would do some analysis on the impacts of temperature on a single infusion 75 minute mash.

It seems that Beersmith has some strange calculations:
Mash @ 62c 75 mins - ABV 5.0%
Mash @ 63c 75 mins - ABV 5.0%
Mash @ 64c 75 mins - ABV 5.5%
Mash @ 65c 75 mins - ABV 5.3%
Mash @ 66c 75 mins - ABV 5.2%
Mash @ 67c 75 mins - ABV 5.0%
Mash @ 68c 75 mins - ABV 4.9%
Mash @ 69c 75 mins - ABV 4.7%
Mash @ 70c 75 mins - ABV 4.6%
Mash @ 71c 75 mins - ABV 5.0%
Mash @ 72c 75 mins - ABV 5.0%

As you can see there is a massive jump between 63 and 64 in the calculations and 70 and 71.

I also noticed if I added 2 steps @ 62/64 for 38 mins, it would bump the ABV to 5.5%. I also noticed if I changed the steps from 38 mins to 5 mins, the ABV remained @ 5.5%.

Can anyone shed any light?
Hmmm s-shaped curve: I can't think of a reason for it, but why not send a note to Brad Smith. Sometime when I play around with the 'measured FG' to see the effect on 'apparent attenuation' I can change the FG by several points and the AA remains unchanged which is obviously incorrect. Then if I enter a very different FG and go back to the ones I entered earlier then they change accordingly and are correct: must be a bug in the program. That said I never rely on the attenuation/ABV predictions in beer smith because there are so many factors at play that it is impossible for the software to predict. You are best relying on the apparent attenuation achieved in previous beers for a given mash temp/yeast.
 

idzy

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Thanks BnT, I will email Brad.
 
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