Author Topic: Boil of rate - I dont get it  (Read 3293 times)

Offline MikeSkril

  • BeerSmith Apprentice Brewer
  • **
  • Posts: 10
  • BeerSmith 2 Rocks!
Boil of rate - I dont get it
« on: May 17, 2015, 05:43:03 AM »
Hi,

I hope someone can help me understand the boil of setting. Here is what I don't understand:

My batch size is 5.5 gal
Boil time 60 min
I set the boil off rate at 1 gal and I checked 'hourly boil off rate'
End of boil Vol shows 5.72 gal

Why isn't the 'end of boil vol' 5.5 gal?

Now I created exactly the same equipment but I unchecked the hourly rate setting. Now the final volume shows 5.5 gal and the hop quantities are lower.

So what exactly is the 'hourly rate' check mark and how can the volume be greater than 5.5 if boil off is 1 gal and boiling for 60 min? That doesn't work out.

Thanks,


Offline Oginme

  • BeerSmith Grandmaster Brewer
  • *****
  • Posts: 3125
  • Goats, guitars, and a home brew; Life is good!
    • Longvu LaManchas
Re: Boil of rate - I dont get it
« Reply #1 on: May 17, 2015, 06:53:27 AM »
What is your loss to trub?  I don't have my computer in front of me to check, but I think the post boil volume also has expansion due to the temperature calculated in.
Recycle your grains, feed them to a goat!

Offline MikeSkril

  • BeerSmith Apprentice Brewer
  • **
  • Posts: 10
  • BeerSmith 2 Rocks!
Re: Boil of rate - I dont get it
« Reply #2 on: May 17, 2015, 01:57:06 PM »
Thats my profile:






Offline Scott Ickes

  • BeerSmith Grandmaster Brewer
  • *****
  • Posts: 1281
  • Brewing creatively and sharing the results!
Re: Boil of rate - I dont get it
« Reply #3 on: May 17, 2015, 03:49:06 PM »
It's correct.  You'll have 6.72 at the start of the boil.  You'll boil off 1 gallon, leaving you with 5.72 gallons after the boil.  When you cool your wort down after the boil, the volume will shrink by .23 gallons.  6.72 gallons - 1 gallon boil off - .23 gallons shrinkage = 5.49 gallons into the fermenter.   It's right.
Kegs:
 Red IPA
 ESB
 Saison Solera
 Dubel (Aged in Malbec Wine Barrel
Aging:
 80 Shilling (In bourbon barrel)
Bottled
 Peppermint Patty Stout
 Wee Heavy

Scott Ickes
https://creativebrewing.wordpress.com

Offline MikeSkril

  • BeerSmith Apprentice Brewer
  • **
  • Posts: 10
  • BeerSmith 2 Rocks!
Re: Boil of rate - I dont get it
« Reply #4 on: May 17, 2015, 05:28:21 PM »
Yes, it is but it was not in the equipment where I checked 'hourly rate'.

I removed the equipment and added it again and its working now.

Thanks!