jessicajames said:
Firstly I am new here, not new to brewing been doing that for 40 years but new to Beer Smith.
Welcome!
I, too, have decades of experience, plus some other credentials.
I was always puzzled about the Equipment Profile, what it meant, what it was for, what it did. Sorry but I still am.
I mash (nowadays) in an insulated bin thingy sparge and boil in a boiler and ferment in a fermenting vessel. Then I ferment for a while and Cask.
This implies that you do not share or collect recipes, and that you've never concerned yourself with consistency. If either were true, then some data about your thingys would be relevant to you.
Efficiency is Output divided by Input pure and simple. Each individual step has it's own efficiency but the overall is what we get for what we put in.
Yes, and no. Overall is EXACTLY what BeerSmith measures since it is targeting the fermenter. However, long standing tradition is to measure in the kettle for mash efficiency. The latter is a process point measurement, not the overall. Since the former is a different measurement point, the how & why bear discussion, which is further proven by the length of the replies.
For instance Boil efficiency is variable dependent upon the diameter of the boil vessel.
This is incomplete. Other factors such as heat power density, btu transfer and ambient humidity are also factors.
Having put 30 odd litres of liquor in there it does not matter how many hops you put in because they are extra and will fill the space at the bottom of the boiler as a filter. They have no effect on efficiency except perhaps to improve it.
I can't agree with you on this. If there is any liquid whatsoever trapped, then it represents a loss of efficiency. Since hops are decidedly more wet after a boil than before, there must be some loss. Again, Brewhouse efficiency accounts for this, mash efficiency does not. Add to that the trub that is best left behind, and the loss is easily measurable.
It's the same with the mash. It dose not matter how much water is absorbed or space taken up by the spent grains because sparge will continue until the runoff is at a low value or enough is collected. I get bored before either.
Perhaps some new brewing books will alleviate the boredom while waiting for a full kettle?

I'm always adding to my brewing library. Ingredients, techniques and overall understanding about the brewing process continue to be studied, discussed and used to make better and better beer.
This exasperated reply is because I cannot see what the fuss is about or the discussion or the parameter in the application.
At it's most basic, it is a way to predict the total amount of grain needed to achieve closely similar results on various systems. Most brewers share recipes and ideas with an eye towards flavor targets, rather than chance. Brewhouse efficiency adapts the results of one brewing system to the capabilities of another.