Author Topic: Boil length adjustment  (Read 1375 times)

Offline Steely_Brewer

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Boil length adjustment
« on: November 09, 2018, 08:31:33 AM »
Is the OG and beer colour guide suppose to adjust when selecting different boil lengths?
My IBU guide changes up and down but not the OG and colour. Boil length will effect both figures so I guess it should?
Help please!
 ???

Offline Oginme

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Re: Boil length adjustment
« Reply #1 on: November 09, 2018, 09:00:58 AM »
Because of the way the software works, the change in boil length will not affect the ending color or OG.

BeerSmith works by having the user define ending volume into the fermenter and the Brew House Efficiency (BHE) for their process.  This determines the amount of sugars from the grains which makes it to the fermenter.  So if you change the boil length, the program will have the same amount of sugars in the fermenter as before you made the change and will adjust the pre-boil gravity to keep the same gravity into the fermenter. The program will then recalculate the water needed for the additional boil off and add that volume to your starting water volume.

To get around this, take the original recipe and note the pre-boil gravity.  Now, change the boil volume and you will see the gravity change accordingly to account for the change in gravity of the wort coming from the mash steps.  You can then adjust the BHE to obtain the same pre-boil gravity as before you made the boil time change.  While this is not perfect, it will get you in the ball park and you can make a new equipment profile reflecting these changes once you see the results of your brew session.  If you record all the user input information on the 'session' tab, the program will give you the calculation of the actual BHE versus the planned BHE.

The IBU number changes because the calculation (I am assuming you are using the Tinseth model) takes into account the effect of average gravity on the isomerization (utilization) of the hop alpha acids.
Recycle your grains, feed them to a goat!

Offline Steely_Brewer

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Re: Boil length adjustment
« Reply #2 on: November 09, 2018, 10:04:44 AM »

Thanks Oginme. With a few more slow reads, I'm sure I will get my head around it.  ;)


 

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