Coldbreak Brewing Giveaway - Open to All!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Can you control the evaporation rate in a boil?
Reply
 
Thread Tools
Old 05-26-2012, 04:03 PM   #1
LarryC
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
LarryC's Avatar
Recipes 
 
Join Date: Jun 2009
Location: San Diego, CA
Posts: 746
Liked 12 Times on 11 Posts
Likes Given: 19

Default Can you control the evaporation rate in a boil?

Last year I bought a new 11 gallon SS boil pot. I love this thing because now I have plenty of head space - no more worry on boil overs!

One thing that has changed that I like a little less is my evaporation rate. My older recipes called for about 7.2 gallons of wert to end up with 5.5 gallons into the fermenter. I upped the amount bot about 7.5 gallons of wert to boil and I'm still coming up a bit short (barely 5 gallons after a 90 min. boil on my last recipe).

I know I can change the evap rate in beersmith and get the numbers to work for this set up but I was just wondering - is there a way to reduce the amount of evaporation loss? I maintain a good rolling boil, not an extreme splashing one and I remove the lid as soon as the temp gets to about 200 so I let all the "stuff" boil out that's supposed to but this still seems like a lot of loss to me.

Thoughts - suggestions??


LarryC is offline
 
Reply With Quote
Old 05-26-2012, 04:10 PM   #2
kh54s10
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
kh54s10's Avatar
Recipes 
 
Join Date: Aug 2011
Location: Tiverton, Rhode Island
Posts: 8,018
Liked 875 Times on 729 Posts
Likes Given: 232

Default

An aggressive boil will lose more, a barely rolling boil will loose less. The dimensions of the pot also changes the boil off rate. A wide shallow pot of the same size will boil off more than a tall narrow pot.

Temperature, humidity and possibly the density of the wort will also have an effect.

I would adjust for your average boil off with the BS2 software and make your recipes for that rate instead of trying to control the boil off.


kh54s10 is online now
 
Reply With Quote
Old 05-26-2012, 04:13 PM   #3
brewit2it
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2011
Location: Glendora, CA
Posts: 845
Liked 15 Times on 14 Posts
Likes Given: 7

Default

There's only a few things you can do about it.

-Boil with the lid partially covering but I suppose there is some chance of retaining some DMS.
-Reduce the length of your boil.
-Boil less vigorously.
-Boil somewhere with less wind and higher humidity, like inside for instance but that's not a viable option unless you have some super powerful burner inside like a dedicated wok burner for instance.

You are pretty much stuck with just starting with the larger pre-boil volume if you are set on sticking to 90 minute boils.
__________________
See my cheap new Keezer Build Here:
http://www.homebrewtalk.com/f51/chea...keezer-224848/

Primary: 2 Row IPA
Second Primary: Kolsch-like ale

Keg 1: Blur Moon
Keg 2: Empty
Keg 3: Empty

Bottled: None
brewit2it is offline
 
Reply With Quote
Old 05-26-2012, 04:27 PM   #4
LarryC
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
LarryC's Avatar
Recipes 
 
Join Date: Jun 2009
Location: San Diego, CA
Posts: 746
Liked 12 Times on 11 Posts
Likes Given: 19

Default

Thanks for the feedback folks. I kind of figured "adjust for it - live with it" was going to be the answer but I just figured I'd ask. Just fyi, the 90 minute boil was just for this particular recipe, most of my boils are 60 minutes.

In any case, I still love the big pot. Beats the hell out of my old 26 qt pot!
LarryC is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Evaporation rate for keggle HollisBT General Beer Discussion 22 01-19-2012 10:23 PM
Insane evaporation rate Wino24 General Beer Discussion 9 10-17-2010 03:44 AM
Airlock Evaporation Talloak General Beer Discussion 4 12-09-2009 02:02 PM
How do you rate your homebrew? aliu630 General Beer Discussion 26 01-07-2008 07:40 PM
Temp control or bigger boil? Hop man General Beer Discussion 3 08-06-2007 01:46 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS