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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > What's an accurate evaporation rate for the hour long boil?
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Old 06-09-2008, 01:08 AM   #1
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Default What's an accurate evaporation rate for the hour long boil?

I'm tweaking the Beersmith settings and the default evaporation rate is 11%. So I would collect 7 gallons of wort and boil down to 5.5 gallons in an hour. That sounds a bit high. Has anyone ever calculated this based on a turkey fryer setup? I have a 30 qt aluminum pot.

Or, what do you have your Beersmith evaporation rate set at? How close is it, typically?

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Old 06-09-2008, 01:11 AM   #2
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11% is my evap rate on our gas stove in the kitchen.

I took my straight-sided 7 gal kettle and added 3 gals of water, boiled for an hour and measured. Boil off is based upon temp and surface area exposed to the air.

Use this experiment to calculate for beersmith.

Eric

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Old 06-09-2008, 01:12 AM   #3
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I boil off about 6% in an hour in my turkey fryer pot and stove top set up. It really depends on how high your burner is going, and how dry it is in your climate.

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Old 06-09-2008, 02:58 AM   #4
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Mine runs about 9% per hour. Whether I'm using a Bayou Classic SQ14 with 10psi regulator under a keggle or my crappy electric stove under a 32qt pot, it stays pretty consistent.

Chad

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Old 06-09-2008, 03:28 AM   #5
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did everyone measure the evaporation at flame out (burner out) or after cooling to room temp, pitch temp?

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Old 06-09-2008, 04:05 AM   #6
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Quote:
Originally Posted by Brew Dude View Post
. . . . what do you have your Beersmith evaporation rate set at? How close is it, typically?
For my Bayou Classic SQ14 and an 11 gallon aluminum pot I have BS set at 15% for a 5+ gallon batch with .4 gallons lost to trub. When I do a 3+ gallon batch with the same equipment I use 18% evaporation rate and .3 lost to trub.

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Mine runs about 9% per hour. Whether I'm using a Bayou Classic SQ14 with 10psi regulator under a keggle or my crappy electric stove under a 32qt pot, it stays pretty consistent.
Damn! I must be using too strong a boil
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Old 06-09-2008, 05:49 AM   #7
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Quote:
Originally Posted by AnOldUR View Post
For my Bayou Classic SQ14 and an 11 gallon aluminum pot I have BS set at 15% for a 5+ gallon batch

Damn! I must be using too strong a boil

I have the same problem going, I was losing like 19 percent per hour, but that sq14 can get mighty hot, and I always put it on FULL BLAST when i use it, which is a mistake...

from now on I am going to go FULL BLAST until i get a boil, then back off A LOT till just enough flame to keep the boil...
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Old 06-09-2008, 12:18 PM   #8
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I boil off about a gallon per hour (in Denver) from my keggle with a gently rolling boil. It doesn't seem to matter how much wort I have in the keg, so I have to fiddle the numbers to get accurate evaporation rates. That works out to be about 14% for 7 gallons of initial volume.

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Old 06-09-2008, 01:45 PM   #9
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Percent doesn't work for me. Boiloff is usually a fixed amount no matter how much liquid is in the same kettle. I lose about 1.5 gallons in 70 minutes in my keggle regardless if I start with 13 or 8 gallons.

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Old 06-16-2008, 02:39 AM   #10
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I tested my evaporation rate today. I lost a little more than a gallon during the hour long boil (About 1.2 gallons). Do I just divide 1.2 gallons by the amount I started with (7 gallons). That's about 17.1 percent. Does that sound normal?

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