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What is your evaporation rate?

Post #1 made 14 years ago
by BIABrewer
I was hoping to collect some more figures on kettle evaporation rates to see if the exisitng evaporation formula used in The Calculator needs any improvement.

If possible, can you please post the following in this thread...

1. Your average internal kettle diameter and type. (For keg users, see picture below and estimate.)
2. How much wort you evaporated off during the boil. (Start of boil volume minus end of boil volume.)
3. The duration of your boil. (eg 60 minutes, 90 minutes etc.)
4. Any notes on how confident you are of your figures. (For example, if they are based on mesurements from one brew, you'd note this.)

Many thanks,
Pat
Keg diameter.jpg
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Last edited by BIABrewer on 12 Nov 2011, 03:09, edited 4 times in total.

Post #2 made 14 years ago
by BIABrewer
Here's an example post though you can use metric or US...
45 cm stock pot

9.7 litres boiled off over 90 minutes

Note: This is based on the average of 6 brews I measured.
Last edited by BIABrewer on 12 Nov 2011, 03:16, edited 4 times in total.

Post #4 made 14 years ago
by hashie
50 litre keggle, 37cm Ø.
My last brew; 33.5 pre boil, 26.5 post boil = 7 litre boil off over 90 minutes.

This tends to be my average + or - 0.5 litres over 90 minutes, depending on relative humidity.

Notes taken on over 100 brews.
"It's beer Jim, but not as we know it."

Post #5 made 14 years ago
by thughes
Just started keeping records:

40cm kettle dia

brew #1: 4.7 l/hr
brew #2: 5.1 l/hr

avg: 4.9 litre/hr
WWBBD?
    • SVA Brewer With Over 100 Brews From United States of America

Post #6 made 14 years ago
by stux
40x40cm pot 50L

7-7.5L/hr at 100C

Circa 250M above sealevel
Last edited by stux on 14 Nov 2011, 06:37, edited 1 time in total.
Fermenting: -
Cubed: -
Stirplate: -
On Tap: NS Summer Ale III (WY1272), Landlord III (WY1469), Fighter's 70/- II (WY1272), Roast Porter (WY1028), Cider, Soda
Next: Munich Helles III

5/7/12

Post #7 made 14 years ago
by Yeasty
Pot: 45cm
Boil: 90m
Boil off: 7.42L avg over last 6 brews. ADMIN NOTE: Have confirmed that this is total evaporation rather than evaporaion per hour.
Last edited by Yeasty on 12 Nov 2011, 21:46, edited 4 times in total.
Why is everyone talking about "Cheese"
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Post #8 made 14 years ago
by Yeasty
Latest brew.

7L over 90 min boil,

Good breeze from the west, damp autumn day although sun shining.


Location N 53*35.098' W 002*24.110'

Elevation 90m (Top of stock pot)

:thumbs:

Yeasty
Why is everyone talking about "Cheese"
    • SVA Brewer With Over 50 Brews From Great Britain

Post #9 made 14 years ago
by thughes
thughes wrote:Just started keeping records:

40cm kettle dia

brew #1: 4.7 l/hr
brew #2: 5.1 l/hr

avg: 4.9 litre/hr
Brewed again yesterday, 4.7 l/hr for an avg over 3 sessions of 4.8 l/hr. Stay tuned for updates as they become available.
Last edited by thughes on 13 Nov 2011, 23:51, edited 4 times in total.
WWBBD?
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Post #10 made 14 years ago
by joshua
Good Day, Due to the atmosphere in South Tennessee, I need to "dipstick" the boil off, Small Batch has 3L to boil off, 34 minutes to 85 minutes. 1800 watt heater. Hops??? FWH only.
Honest Officer, I swear to Drunk, I am Not God.
    • SVA Brewer With Over 100 Brews From United States of America

Post #12 made 14 years ago
by shibolet
my pot is SQUARE (!). so i have trouble enough with the Calculator as is :dunno:

width 32cm X length 40cm = surface area of 1280 cm^2

i am sorry to say i don't keep good records regarding my boil off rates (or anything else for that matter).
but i would estimate its around 5 liters for a 40-45 liter batch.
Cube:
fermenter: Sourdough Spelt Ale, Classic Lambic, Oud Brune, Barrel Aged Belgian Dubbel
Kegs: Bob's Black IPA, Blanc Blond, Soda...
to be brewed:

Post #13 made 14 years ago
by Zelig
Sorry but my experience about it is not very significant.
I did only one brew, I have a strange shaped pot (wider at the top and narrow at the bottom) and using my stove burner I can't get a really good "rolling boil". In fact my evaporation was 1 liter less than what expected from the calculator (5 instead of 6).
Anyway I think that it'll be important to have a customizable parameter in the new calculator, so everyone can adjust it based on individual experince with it's own equipment!
    • SVA Brewer With Over 50 Brews From Italy

Post #14 made 14 years ago
by Pat
Thanks very much for the above. Please keep the figures coming :salute:

The new calculator does have over-ride buttons for things like evaporation rate, efficiency, and trub losses so all will be good there Zelig :)
Are you a "Goodwill Brewer?" Pay forward and Buy Some BIPs ;)

Post #15 made 14 years ago
by nik
56 L insulated SS pot staight sided 39,90 cm diam.
My evaporation for 90 min boil is about 7,5 liters average
Calculators states 5,35 per hour and 8 liters for 90 min
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Post #16 made 14 years ago
by Hippy
Usually get around 11L evaporation from a 49.8 cm diameter 98L pot with a preboil volume of around 68L on a 90min boil, with an Italian spiral gas burner. My other rig however, which is a 40L birko urn with an exposed element, has always been spot on to the calculator's figures.

Post #17 made 14 years ago
by Mad_Scientist
1. 16" with a 12" cut-out on an American 15.5 gallon Sanke beer keg
picture; http://www.flickr.com/photos/madscienti ... 863958775/
2. 1 to 1.1 gallon
3. 60 minutes
4. I have dialed in my volumes over my last 8 BIAB brews,
i.e. knowing my starting volume of water,
grain weight, grain absorption and bag squeezing,
measuring starting 'brew length' via a sight tube,
propane flame height and sound,
Beer Tools Pro software,
and measuring knock-out 'brew length' via a sight tube.
    • SVA Brewer With Over 100 Brews From United States of America

Post #19 made 14 years ago
by mordantly
Lylo wrote:Mad_Scientist,do you have any tips on sparkling up your kegs?The look great!I am running low on elbow grease aka bartenders friend.

all i use is barkeeper friend OR brasso and elbow grease... i would like to get some buffing pads for my angle grinder. all my corny kegs got a GOOD polishing when i enslaved them and boy do they look pretty friggin nice still!


as for evaporation, i always get between a quart and a gallon over 60 minute boils in my sanke keg with ~12" hole.. my nat gas burner has been "converted" to LP as my house is on it and i recently downsized the orifice and got a much more blue flame in the area of flow i use so i need to nail down a consistent flame setting and lid position.
Last edited by mordantly on 17 Nov 2011, 12:33, edited 4 times in total.
MoRdAnTlY [Mr. Wolf '91 - '11]

Post #20 made 14 years ago
by McCue
I adjust the boil rate to evaporate as close to 1 gal / hour as possible. My boils are usually 60 min though I'll occasionally do a 90 or 120 min if the recipe calls for it. My kettle is 8 gal, inner diameter is 14 inches.

Post #21 made 14 years ago
by dicko
I use a 40L Crown Urn and do a 90 min boil.

Average boil off is 3.4 litres per hour.
Figure calculated from 11 BIAB brews.
On Tap: ESB,Oatmeal Stout, APA
Primary: APA x 2
Cubed: Nowt

26/07/12

Post #23 made 14 years ago
by Mad_Scientist
Lylo wrote:Mad_Scientist,do you have any tips on sparkling up your kegs?The look great!I am running low on elbow grease aka bartenders friend.
Are you referring to these two here; http://www.flickr.com/photos/madscienti" onclick="window.open(this.href);return false; ... 217054265/
those are my two Italian kegs I bought new in 2006. I have 5 other used kegs I got this year, rich man poor man kinda thing...
Last edited by Mad_Scientist on 01 Dec 2011, 07:18, edited 4 times in total.
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