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-   -   What's an accurate evaporation rate for the hour long boil? (http://www.homebrewtalk.com/f36/whats-accurate-evaporation-rate-hour-long-boil-68547/)

Tankard 06-09-2008 12:08 AM

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?

r2eng 06-09-2008 12:11 AM

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

Yooper 06-09-2008 12:12 AM

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.

Chad 06-09-2008 01:58 AM

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

makapol 06-09-2008 02:28 AM

did everyone measure the evaporation at flame out (burner out) or after cooling to room temp, pitch temp?

AnOldUR 06-09-2008 03:05 AM

Quote:

Originally Posted by Brew Dude (Post 706434)
. . . . 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.

Quote:

Originally Posted by Chad (Post 706524)
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 :confused:

stevecaaster 06-09-2008 04:49 AM

Quote:

Originally Posted by AnOldUR (Post 706603)
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 :confused:


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...

jds 06-09-2008 11:18 AM

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.

Bobby_M 06-09-2008 12:45 PM

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.

Tankard 06-16-2008 01:39 AM

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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