tctenten said:
Carrying over from Ask Wheebz....When I picked up the ingredients yesterday one of the brewers came out and asked if I had any questions and told me that it should finish @ 1.010 - 1.015. I assume he didn't give me any OG numbers because he, nor I, have any idea about my efficiency. If I put all the ingredients into beersmith and go through my process of brewing, I will then be able to figure out my efficiency? I realize I may not wind up with the beer that was intended, or hit the gravity that was intended, but for future brew I will then be able to figure a grain bill if I do want to hit a certain OG. Am I correct in believing this?
Techniques (BIAB vs fly sparging vs decoction vs batch sparging vs false bottom or not) all influence efficiency, as does the mill gap, the temperatures, the age and batch-specific details of that grain etc ...
So, like ... efficiency is a ball-park thing for homebrewers, more dialed in for pro's ... it's more critical to their bottom line that they get much higher efficiencies ...
I am going to guesstimate that your efficiency for full-volume BIAB (no sparge) for an 8.5% ABV viscosity wort of an IPA-type beer will be 62-65%, if you don't squeeze the shit out of the bag (which extracts tannins, don't do it) ...
The way it works, or at least how I did it, is that you brew now ... and you see how far off your gravities turn out to be ...
If you find that you are consistently overshooting your targeted gravity (I have the last two brews), increase your kettle efficiency FOR THAT TYPE OF BEER (ABV, amount of roasted/toasted grains) ...
You will narrow in on this over time ...
I know that my system, when cramped, and I'm asking it to recirc hot liquor that's half way to corn syrup it's so loaded w/ starches (mulberara, miyagi, and bhut), i have trouble even getting 55% efficiency ... because there's a lot of roasted toasted crap without no diastatic (lintner) power, and a lack of fresh water to rinse the grains (no sparge, full volume BIAB) ...
What's happened the last two, is that I didn't raise the efficiency enough for my session-normal beer's the last couple of brew day's ... they're more like 60-65% efficiency ...
Over time I'll know what efficiency to use for beers, from paying attention to how I'm over or undershooting my efficiency when making the recipe ...
In the brew, adding extract or boiling longer will increase gravity ... and adding water with decrease it ...
It's not all just haha cool I get a higher gravity if it puts you out of range of the style, the yeast etc ...
If you end up boiling longer to get gravity, it's worth considering whether the extra maillards will be kool and the gang in that style ... probably not as big of a deal for a dark beer, and probably a mistake on the pilsner end, I'm assuming ...
If you end up adding DME or LME, you want that going in w/ like 15 mins left in the boil, I think I've seen ... basically just enough time to ensure it gets handled in terms of critters/bugs, but probably also so that it's not overly stratified in the liquid matrix ... its worth noting that added extract will often darken your beer, and in the only batch of mine that got any - the Zorg - I was taken aback by how much a single pound of extra light DME darkened the wort ...
That should clear it all up =) ...