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Old 04-03-2010, 01:12 PM   #1
RedGlass
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Default BTP Boil Volume

I'm pretty sure this is a really stupid question, but I need to ask it anyway.

When I'm setting up a recipe in BTP, I see a bigger volume going into the kettle than the numbers account for. For example, a "Brewing Classic Styles" recipe has a 7 gallon boil and a 6 gallon final volume...yet when I set my numbers for a 6 gallon final, with 1 gallon evap. per hour and 1 hour boil...it tells me 7.25 should be going into the boil.

I can only think of 3 possible explanations:

1) There is some setting for trub loss or something that I cannot find and I need some guidance.
2) The software is calculating the .25 gal difference because the final volume is at 68*F and the kettle volume is at 212*F (That would really amaze me if there is a .25 gal difference between the temps).
3) I have absolutely lost my mind.

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Old 04-04-2010, 03:20 PM   #2
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Anyone?

Maybe I can simplify since I wasn't very clear in the OP. I set a 6 gal final volume. I set 1 gal evaporation per hour. I set a 1 hour boil. To me, that should make a pre-boil volume of 7 gallons. Beer Tools Pro tells me my volume should be 7.25 gallons. Why?

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Old 04-04-2010, 03:23 PM   #3
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I dont use BTP, but every software has a # for trub loss, it also has a # for loss of volume due to wort shrinkage (after cooling it is about 4% of the volume)

It is compensating for trub and or shrinkage is my only thought, you can adjust those #s somewhere.

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Old 04-04-2010, 04:54 PM   #4
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It's the volume shrinkage. The kettle vol is at 212 and the final is at 68F.

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Old 04-04-2010, 07:10 PM   #5
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Why 212 however? It seems like a volume based upon the temp you fill the kettle makes more sense - 170F or so.

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Old 04-04-2010, 07:14 PM   #6
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Good question

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Old 04-04-2010, 07:19 PM   #7
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In the schedule section, all volume measurements are temperature dependent so it might specify 7.1 gallons of runnings but it will then show something like 7.25 gallons at boil. I think they just had to pick a single temp for the field and went with 212.

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Old 04-04-2010, 07:31 PM   #8
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Thanks all.

Quote:
Originally Posted by samc View Post
Why 212 however? It seems like a volume based upon the temp you fill the kettle makes more sense - 170F or so.
I had the exact same thought, which is what made me ask. I'm still amazed that liquid water expands so much when heated...
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Old 04-05-2010, 01:00 AM   #9
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Think about it this way, if they chose 165F, which would be about right for an all grain brewer, it would exclude extract brewers. 212 is a common temp in the boil kettle for all brewers.

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