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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Evaporation rate
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Old 05-28-2011, 12:09 AM   #1
enohcs
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Default Evaporation rate

Will water evaporate at a constant volume or a constant percent? Real example: my pre boil volume is 10 gallons, I boil for 90 minutes and finish with 7.5 gallons. How many gallons do I need to start with if I want to end with 13 gallons after a 90 minute boil?


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Old 05-28-2011, 12:12 AM   #2
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Seriously??

IF you maintain the same boil rate, use the same amount of energy (either electric or gas) to heat the wort, and the kettle is the same size/shape, then you'll lose 2.5 gallons in 90 minutes no matter what your starting batch size is. So, start with 15.5 gallons of wort to get 13 gallons at the end of the boil...

Pretty basic logic here Bubba...


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Old 05-28-2011, 12:56 AM   #3
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condescension sucks.
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Old 05-28-2011, 02:26 AM   #4
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Quote:
Originally Posted by IronMike View Post
condescension sucks.
Agreed!
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Old 05-28-2011, 02:31 AM   #5
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Quote:
Originally Posted by Golddiggie View Post
Seriously??

IF you maintain the same boil rate, use the same amount of energy (either electric or gas) to heat the wort, and the kettle is the same size/shape, then you'll lose 2.5 gallons in 90 minutes no matter what your starting batch size is. So, start with 15.5 gallons of wort to get 13 gallons at the end of the boil...

Pretty basic logic here Bubba...
Environmental conditions (ambient temperature, humidity, wind, etc) will play a role also.
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Old 05-28-2011, 03:36 AM   #6
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Quote:
Originally Posted by IronMike
condescension sucks.
Major +1


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