Happy HolidaySs Giveaway - Winners Re-Re-Re-Re-Re-Drawn - 24 hours to Claim!

Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > General Beer Discussion > Can you control the evaporation rate in a boil?
Reply
 
LinkBack Thread Tools
Old 05-26-2012, 05:03 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 Quick reply to this message
Old 05-26-2012, 05:10 PM   #2
kh54s10
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2011
Location: Tiverton, Rhode Island
Posts: 7,160
Liked 680 Times on 577 Posts
Likes Given: 173

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 offline
 
Reply With Quote Quick reply to this message
Old 05-26-2012, 05:13 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 Quick reply to this message
Old 05-26-2012, 05:27 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 Quick reply to this message
Reply



Quick Reply
Message:
Options
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 04:44 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 02:46 PM



Newest Threads

LATEST SPONSOR DEALS