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Old 07-06-2009, 04:59 PM   #1
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Default Boil off on 11 gal batches?

Need some help on my boil off figures for going to 10 gallon batches.

Currently I am using a setup where I am boiling off roughly 35.75% of volume off in a 90 minute boil to end up with a 5.5 gallon final cold volume. These boils are starting off at 8.56 gallons pre boil due to the liquid surface area width of my BK which is quite large due to how wide it is.

Now with all of that said I am going to make a jump to 10 gallon batches here soon and utilizing the same equipment figures in Beersmith gives me almost a 15 gallon pre boil volume which seems extremely large but right on point with the current boil off values. My only concern here is the fact that I am dealing with a larger volume of liquid and it may not boil as vigorously as the smaller 5.5 gallon batch. Should I use two different equipment profiles for the larger sized batches? I have no problem boiling this larger amount of liquid having a 20gal BK but I am concerned that these figures will be incorrect due to dealing with a larger amount of wort.

Thoughts?


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Old 07-06-2009, 05:05 PM   #2
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Fill system with 10 gallons of water and boil it for 90 minutes.

If the factor changes set-up another equipment profile.


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Old 07-06-2009, 05:13 PM   #3
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I would think that if 3.01 G boiled off on a 5 G batch, 3.01 G would boil off on an equally vigorous boil of an 11G batch. Not so much a percentage. Can someone explain this?

Climate and boil consistent, should boil off the same amount of water in the same amount of time, not the same percentage of water.

This is just my thought and assumption.
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Old 07-06-2009, 05:38 PM   #4
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I would think that if 3.01 G boiled off on a 5 G batch, 3.01 G would boil off on an equally vigorous boil of an 11G batch. Not so much a percentage. Can someone explain this?
I agree that the boil off rate is more of a constant than a percentage IF you are using the same boil kettle for both. The surface area and boil strength are the biggest factors to boil off rate, though outside temp and humidity are also factors. So if you boil at the same strength with the same surface area then the amount of liquid boiled off would be the same. The total liquid volume would not be a determining factor. At least that is how I understand it.
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Old 07-06-2009, 05:40 PM   #5
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Originally Posted by IrregularPulse View Post
I would think that if 3.01 G boiled off on a 5 G batch, 3.01 G would boil off on an equally vigorous boil of an 11G batch. Not so much a percentage. Can someone explain this?

Climate and boil consistent, should boil off the same amount of water in the same amount of time, not the same percentage of water.

This is just my thought and assumption.
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I agree that the boil off rate is more of a constant than a percentage IF you are using the same boil kettle for both. The surface area and boil strength are the biggest factors to boil off rate, though outside temp and humidity are also factors. So if you boil at the same strength with the same surface area then the amount of liquid boiled off would be the same. The total liquid volume would not be a determining factor. At least that is how I understand it.
Yep, I agree. Since the surface area is the same, you should have the same boil off. Not as a percentage, but as a volume. If you boil off 1.5 gallons an hour with 5 gallons, in the same pot you will boil off 1.5 gallons an hour with 10 gallons alos.
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Old 07-06-2009, 05:42 PM   #6
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The boil off rate (measured in gallons/hour, not percent volume/hour) may actually decline slightly since 11 gallons will require more energy to sustain a boil.
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Old 07-06-2009, 05:45 PM   #7
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The boil off rate (measured in gallons/hour, not percent volume/hour) may actually decline slightly since 11 gallons will require more energy to sustain a boil.
Yes. And, if you are in fact boiling off 35% an hour I'd wager you could also stand to put less energy into your boils.
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Old 07-06-2009, 05:55 PM   #8
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The boil off rate (measured in gallons/hour, not percent volume/hour) may actually decline slightly since 11 gallons will require more energy to sustain a boil.
What kind of volume are you talking about as "slight"? anything noticeable the casual brewer?

I tend to not take as good of notes as I always say I'm going to and always stress about volumes.
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Old 07-06-2009, 06:42 PM   #9
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I'm not certain, since there are so many variables at play. The volume increase is significant enough to warrant a trial run to recalculate the boil off rate.
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Old 07-06-2009, 07:29 PM   #10
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Quote:
Originally Posted by Yuri_Rage View Post
The boil off rate (measured in gallons/hour, not percent volume/hour) may actually decline slightly since 11 gallons will require more energy to sustain a boil.
This is exactly what I am talking about. I am thinking that the boil off rate will be slightly lower due to the fact that the liquid will not boil as vigorously being larger. This is the same exact kettle and setup I use for 5.5 gal batches.

This marginal percentage that Yuri was referring to may actually be calculated with BeerSmith, when I figure up the boil off estimation that I get in Beersmith for a 10 gallon batch starting with a pre boil volume of 14.95 gallons I get a 33.12% boil off rate over the course of 90 minutes.

Estimated boil off for 5.5 gal batch: 35.75%

Estimated boil off for 10 gal batch: 33.12%

Looks like BS factored in a 2.63% loss of boil off.



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