hashie wrote:I think, from all of this, it would be great if we could have a forum standard for efficiency...
[
I am pretty sure that hashie wrote the above just to stir me up - he knows what a massive problem this is and how I love writing essays on it . The bastard better read every single word I write below ]
Funnily enough, that old thread I copied MHB's quotes from above tried to tackle just this issue of defining efficiency when used without the qualifications, "into kettle," post-boil,' into fermenter,' "into packaging," etc.
No joy there unfortunately and I can't see there being any joy soon for a few reasons...
1. Home brewers generally do not use the term correctly. The term, "efficiency," cannot have a figure applied to it because the term refers to all efficiencies. So, of the following two sentences only one is correct...
a) "Sometimes, not adjusting your mash to the right pH can have a considerable effect on efficiency."
b) "I forgot to adjust my mash for pH and my efficiency dropped by 5%."
The first sentence is correct. Sometimes, not adjusting your mash to the correct pH will lower your efficiency into the kettle (pre-boil) and your efficiency post-boil and your efficiency into the fermenter and your efficiency into packaging.
The second sentence means nothing. If it said, "efficiency into the kettle," or maybe "efficiency into the fermenter," then it would be correct.
So, the word, "efficiency," should be used as a generic term that includes
all efficiencies.
2. "Brewhouse Efficiency" - The above problem occurs because many brewers assume that "effficiency," is short for, "brewhouse efficiency." Even if it was, next time you are having a beer with fellow brewers, ask them what they think brewhouse efficiency really means. I have run polls on this and the answers are frightening. I have corresponded with highly trained brewers on this subject and most of them think it should mean what you get into your kegs or bottles but none of them have been entirely sure. (Is your brewhouse your MLT and kettle or is it your MLT, kettle and fermenter?)
3. The problem is constantly compounded - We all start brewing and think we know what efficiency means. Then we do a few brews from different sources and either start scratching our heads or we don't care about figures or when posting recipes we fudge the figures to make them look right. A lot of brewers will just assume that someone has made an error when posting a recipe (or they have made a measurement error) without even considering the possibility that maybe that brewer has a different interpretation of, "brewhouse efficiency," than they do.
What We Could Do
Immediately solving the above problems is impossible even on a young forum like this. (You'd need to get all members to sign an affadavit upon registering that they promise and cross their heart, never to use the word efficiency or brewhouse efficiency without it meaning...
And that they had read everything else in BIABrewer.info Essentials
)
So, even defining "Brewhouse Efficiency," is not something that is going to happen soon.
Writing the phrases, "Efficiency into kettle,"/"Pre-Boil Efficiency," "Post-Boil Efficiency," Efficiency into Cube," Efficiency into the Ferementer," or "Efficiency into Packaging," takes about the same time to write as the term, "Brewhouse Efficiency."
So, what us more experienced brewers who recognise this big problem can do, on this forum, is always use such phrases. They leave
no room for confusion.
Many brewers, especially new ones, are not even aware of the above problem so when someone does write a post saying, "My efficiency was
x%," we should take the time to let them know that their sentence is incorrect. Better still, maybe there should be a locked thread here that we can all refer such people to?
Useful figures to emphasise when publishing recipes
When you publish a recipe, the two most useful figures you can hand on to other brewers are (apart from your grain and hop bill)...
a) Your volume at the end of the boil.
b) Your original gravity (which stays the same from the end of the boil right through to pitching.)
There is no need to even state an efficiency figure as the above will readily tell other brewers your post-boil efficiency. But, if you did state it, you should clearly write, "Post-Boil Efficiency." (You will need to write this if you publish your grain bill as percentages.)
Providing the above removes all ambiguity. It saves other brewers having to make many guesses. For a start, they won't have to guess what you mean by "efficiency" or "brewhouse efficiency." They also won't have to guess how much kettle trub they have compared to you or fermenter trub (and for no-chillers, cube trub.)
If all experienced brewers did the above, then we would be accelerating new brew's wisdom in this area and then, one day, recipe conversion will take two seconds
.
PP
[Was that long enough hashie? You better have read it slowly and several times too! Anyone who does should be able to become a terminolgy despot just like me
.]