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Old 07-06-2009, 07:32 PM   #11
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I consistently boil off one gallon/hour regardless of starting volume.

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Old 07-06-2009, 09:20 PM   #12
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Boil off rate should be about the same. BOIL OVER rate may go up.....

David

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Old 07-06-2009, 09:32 PM   #13
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I will have 25% headspace in the kettle and have the option of using fermcap, boil over rate will be minimal at best

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Old 07-06-2009, 09:42 PM   #14
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Quote:
Originally Posted by hukdizzle View Post
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.
Not sure, but it sounds like you're missing the point that is being made here. The boil off rate in BeerSmith is useless. Boil off has to be measured in gallons per hour, not a percentage of the volume. If you boil off 1-1/2 gallon with a five gallon batch, you'll boil off 1-1/2 gallons with a ten gallon batch. That means that the percentage you use in BeerSmith will be about half. Adjust that percentage number until it gives you the same volume boiled off as you get with a five gallon batch.

This is assuming a constant intensity of boil and you'll have to apply more heat to the larger batch to achieve that. But from the sound of it you may be boiling a bit too hard as is. You're not just going full bore with your burner, are you?
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Old 07-07-2009, 12:47 AM   #15
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The "boil off %" thing just needs to die. It's flat-out wrong, yet it keeps getting perpetuated in calculators like Beer Smith.

Every system is different - even with the same size kettle. Hell, even location (altitude) makes a big difference. Only way to accurately determine YOUR gal/hr boil off rate is to test it.

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Old 07-07-2009, 03:00 AM   #16
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Originally Posted by AnOldUR View Post
Not sure, but it sounds like you're missing the point that is being made here. The boil off rate in BeerSmith is useless. Boil off has to be measured in gallons per hour, not a percentage of the volume. If you boil off 1-1/2 gallon with a five gallon batch, you'll boil off 1-1/2 gallons with a ten gallon batch. That means that the percentage you use in BeerSmith will be about half. Adjust that percentage number until it gives you the same volume boiled off as you get with a five gallon batch.

This is assuming a constant intensity of boil and you'll have to apply more heat to the larger batch to achieve that. But from the sound of it you may be boiling a bit too hard as is. You're not just going full bore with your burner, are you?
Makes complete sense now, thanks for that I am hard headed haha.

I am running my boils all out which is more than likely a waste of propane but I did it to have a constant output of heat/propane.
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Old 07-07-2009, 10:02 AM   #17
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I am running my boils all out which is more than likely a waste of propane but I did it to have a constant output of heat/propane.
I'm a fan of a good rolling boil, but don't go crazy. I have a Bayou SQ14 and a 15 gallon pot. Even when boiling 10+ gallons, I will back off the heat once hot break is achieved.
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