I'm having some trouble getting consistent results with the beersmith boil off tool.
For my system I have 9% boil off per hour. So If I'm aiming for a 6 Gallon batch with an OG of 1.092 I have a preboil volume of 7.42 gallons. I adjust the boil off/evaporation rate in the details tab.
Well, I would like to know what my preboil gravity should be so that I can hit my OG post boil. I open up the Boil Off tool to get the numbers. I enter in the starting volume at 7.42 gallons and my evaporation rate at 9%, boil time is set to 60 minutes. A few things are wrong: the final volume it is giving me is 6.48, .48 higher than what it should be. The starting gravity reads 1.080 (in order to give me a OG of 1.092 post boil). So I adjust the evaporation percentage - turns out it needs to be set at 16% in order to have the correct final volume of wort (5.98 gallons). Now, the post boil gravity is messed, it reads 1.099, so I adjust starting gravity to 1.074 in order to make the numbers line up again.
Why are my evaporation percentages so different?
For my system I have 9% boil off per hour. So If I'm aiming for a 6 Gallon batch with an OG of 1.092 I have a preboil volume of 7.42 gallons. I adjust the boil off/evaporation rate in the details tab.
Well, I would like to know what my preboil gravity should be so that I can hit my OG post boil. I open up the Boil Off tool to get the numbers. I enter in the starting volume at 7.42 gallons and my evaporation rate at 9%, boil time is set to 60 minutes. A few things are wrong: the final volume it is giving me is 6.48, .48 higher than what it should be. The starting gravity reads 1.080 (in order to give me a OG of 1.092 post boil). So I adjust the evaporation percentage - turns out it needs to be set at 16% in order to have the correct final volume of wort (5.98 gallons). Now, the post boil gravity is messed, it reads 1.099, so I adjust starting gravity to 1.074 in order to make the numbers line up again.
Why are my evaporation percentages so different?