Hey all,
Just trying to figure something out here.
For my past 10ish batches I've noticed that my preboil gravity is significantly higher than what Beersmith calculates, yet at the end of the boil I'm getting the correct gravity.
Here's an example batch and what I've entered into Beersmith:
Batch Size - 20L
Boil Volume - 29.5L
Boil Time - 65 mins
Brewhouse efficiency - 66%
Lauter tun deadspace - 2.0L
Evap rate - 19% (Boil off 5.8%)
Lost to boil trub/chiller - 1.5L
Cooling loss - 4% (0.83L)
Preboil gravity - 1.031
OG est - 1.042
___________
So I mash, get 29.0L into the kettle, at 1.037. Boil is done and dusted, transfer 20.0L to fermenter at an OG of 1.042.
At the end of the day it's not a big deal because I'm almost always +-2 gravity points of the estimate for the usual gravity beers I brew. But I'd like to brew some bigger beers and have a better estimate of my gravities. Interesting thing is that when I first started brewing all grain and using Beersmith the pre boil gravities were fine, but after a couple years of equipment changes and adjustments in BS the measurements are way out.
Any ideas how I can fix this up?
Cheers :-D
Just trying to figure something out here.
For my past 10ish batches I've noticed that my preboil gravity is significantly higher than what Beersmith calculates, yet at the end of the boil I'm getting the correct gravity.
Here's an example batch and what I've entered into Beersmith:
Batch Size - 20L
Boil Volume - 29.5L
Boil Time - 65 mins
Brewhouse efficiency - 66%
Lauter tun deadspace - 2.0L
Evap rate - 19% (Boil off 5.8%)
Lost to boil trub/chiller - 1.5L
Cooling loss - 4% (0.83L)
Preboil gravity - 1.031
OG est - 1.042
___________
So I mash, get 29.0L into the kettle, at 1.037. Boil is done and dusted, transfer 20.0L to fermenter at an OG of 1.042.
At the end of the day it's not a big deal because I'm almost always +-2 gravity points of the estimate for the usual gravity beers I brew. But I'd like to brew some bigger beers and have a better estimate of my gravities. Interesting thing is that when I first started brewing all grain and using Beersmith the pre boil gravities were fine, but after a couple years of equipment changes and adjustments in BS the measurements are way out.
Any ideas how I can fix this up?
Cheers :-D