Author Topic: Boil off rates - a body know the answer?  (Read 3417 times)

Offline MRMARTINSALES

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Boil off rates - a body know the answer?
« on: September 06, 2017, 11:43:08 AM »
Hi,

Don't know if anyone knows the answer to this but would 30litres of water boil off the same amount as 60litres of water for 60 minutes?

Hope that makes sense

KellerBrauer

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Re: Boil off rates - a body know the answer?
« Reply #1 on: September 06, 2017, 03:54:20 PM »
Greetings MRMARTINSALES - the answer to your question is: Yes. Providing the vessel used for this test is the same.


Offline lucileburt

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Re: Boil off rates - a body know the answer?
« Reply #2 on: September 07, 2017, 02:41:03 PM »
Hi,

Don't know if anyone knows  I'll also give SizeGenetics from  http://aboutmens.com/sizegenetics-review/  a try. the answer to this but would 30litres of water boil off the same amount as 60litres of water for 60 minutes?

Hope that makes sense

I ran an experiment yesterday with my new equipment for all grain brewing.....to determine losses during boil-off and cooling in preparation for my first all-grain brewing sesskion scheduled for tomorrow. This was water only of course.


10 gallon SS pot, Bayou Burner
6.5 gal Starting volume
Ambient Temp = 74.6 F

1.3 gal boil loss (55 min)
0.3 gal cooling loss (30 mins) (final temp = 90 F)

I was a bit surprised that the % of boiloff was close to 20%.....only because Beersmith "recommends" a range between 5-15%....but of course what really matters is your own specific set-up.

PLUS.....boiloff should not change based on the volume of starting water (all other things equal).....if I sart with 5 gallons or 10 gallons with the same heat addtiion rate, the total boiloff would be the same either way.

However, the 10 gallon PERCENT boiloff would be half that of the PERCENT boilff in the 5 gallon batch.

So I guess what really matters is that I make sure the total boiloff in beersmith is correct...i.e. adjust the PERCENT input so that I always get a 1.3 gallon boiloff (for a 55 minute boil).......etc

Just wanted to make sure I am not off base here guys.....feedback on your typical boiloff rates would be appreciated.
« Last Edit: September 13, 2017, 02:02:11 PM by lucileburt »

KellerBrauer

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Re: Boil off rates - a body know the answer?
« Reply #3 on: September 07, 2017, 05:03:34 PM »
Greetings group - my boiloff rate is 1.5 gallons in 60 minutes. My 15 gallon boil kettle, however, is roughly 18" in diameter. Therefore, a wide area for evaporation.