zazbnf
Senior Member
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- Dec 22, 2010
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How was the bourbon?
I'm still not clear why because the barrels didn't contract as much they got a lower abv. I can understand the more mellow part since that would mean the barrels didn't release as much of the oak and bourbon. Furthermore, if it got colder than usual, wouldn't that actually mean the barrels contracted more? Having to heat up the cellar sounds like they were trying to get the barrels to not contract. It could be he meant the barrels didn't evaporate as much, but again it doesn't make sense as decreased evaporation should result in maintaining a higher abv.
When the temperature gets warm, the oak opens up allowing beer to soak into the wood. When it gets cold the wood contracts forcing the beer back out. The more frequently this happens, the more barrel profile is imparted. I am assuming they meant there were less cycles of expansion/contraction when they said didn't contract as much. As for the ABV, There are 2 factors that could influence this after it got to the barrel.
1. The volume of alcohol left in the barrels when they were filled. If they were filled in cold weather, the wood would have contracted leaving less bourbon behind in the wood for the beer.
2. Humidity. In high humidity the primary evaporation from the barrels "the angels share" is alcohol which would decrease the abv. However, if the humidity in the barrel room was very low, the angels share would be mostly water therefore increasing the abv.