MuddyCreek
Well-Known Member
Sorry I haven't had time to answer everything yet. I had to take my wife to the Dr. yesterday. She's been experiencing a bunch of migraines in the last week and we needed to take her in suddenly. Fortunately there's nothing wrong neurologically.
I've been asked a couple questions about scaling, one on PM and another here I think.
To be clear, I've promised I'll be honest from the outset. I'm a newbie to the large-scale brewing scene. So take my answers with a grain of salt, shall we?
My efficiency has been a bit low. I believe there are a number of reasons for this, mostly based on our being underpowered right now. There are some delays in the brewing cycle, most notably between the transfer to BK after mashing and sparging before the boil begins. This is due to our seriously undersized burners which we are still waiting on.
We are also waiting on proper fittings for our chiller. In the meantime I'm using the HLT as a chiller. It works but it's slow. That means it takes an extraordinarily long time to get the boiled wort (after it finally DOES boil,) down to pitching temp.
Of course the chilling situation doesn't really have any effect on our pre-boil efficiency. I've been getting around 75% on the big tanks brewing half batches. I'd like to see a better number obviously. I'm planning on sitting in with another local brewer this weekend and watching him brew to see if I can pick up on anything and maybe find where I'm making some mistakes.
Another part of our overall inefficiency which will just take time to work out and get better with is understanding our tanks and hoses. We haven't hard-plumbed yet because we want to make sure we're happy with where everything is at. So we're moving transfer hoses everywhere, some of which are pretty long and therefore fill up with lots of beer. So at the end of a brew day we end up losing a fair amount of beer in the hoses along with a good chunk in the bottom of the BK and the Mash Tun that didn't quite come out while we were transferring.
So, with our 10 bbl system doing a 1/2 batch we lose 20 or 30 gallons of beer along with what we are going to lose in the fermenters which kinda sucks. You know... The suck. Just stuff we have to learn and get better with as we brew more and more batches. New equipment, that sort of thing.
So, all that said...
Scaling up, I based my scaling on a "guessed" efficiency. I guessed 75% for my first batch because I wanted to be really conservative. I wasn't far off. ;-) I simply scaled up THE GRAIN VALUES from my old tried and true 5 gallon recipes based on the efficiency scale.
As a result I ended up hitting my numbers right on with my first brew. My second was off by a fair bit though and I had to fix it with DME. My third and fourth batches were dead on however. So it seems that method worked alright for me.
So what I'm saying is that I didn't seem to have any problems scaling up my MALT linearly using efficiency and my expected output.
Now, hops is an entirely different critter.
I just used the formulae below to figure out my hops. It seems pretty accurate and compared to the Pro Mash is very close (although Pro Mash comes in just a little lower in IBUs which I personally think is wrong. Don't hate me. I know I'm new...)
You probably recognize this formula, it's pretty standard for calculating IBUs
AAU = Hops AA * Weight
U = Time in boil [Minutes] cross referenced by F [factor determined by wort gravity]
CC = Metric Conversion Constant [75]
V = Volume of boiled wort to which hops is exposed
IBU = (AAU * U * CC) / V
* Note, I use full boils. This calculation doesn't work with the "Hop Tea and Lauter" method. That's a different calculation.
I assume most of you have the table that shows the U(tilizatioin) factors. This works pretty well and showed immediately why some of my pilot system batches were really low on the hops bite. I was just doing linear scaling on an IPA from 5 gallons to 40 and that was really really wrong.
I built a spreadsheet that shows you immediately where you need to up your various values to get the right IBUs you want. It also shows you how to get the right additions from the bittering, flavor and aroma additions to match your original design from the smaller batch.
So, for what it's worth. I hope that answers some questions. I'm still working on efficiency. It seems as though Malt scales fairly well, hops not so much. But, Damn if those math teachers weren't on to something. You really CAN use it in everyday life.
I've been asked a couple questions about scaling, one on PM and another here I think.
To be clear, I've promised I'll be honest from the outset. I'm a newbie to the large-scale brewing scene. So take my answers with a grain of salt, shall we?
My efficiency has been a bit low. I believe there are a number of reasons for this, mostly based on our being underpowered right now. There are some delays in the brewing cycle, most notably between the transfer to BK after mashing and sparging before the boil begins. This is due to our seriously undersized burners which we are still waiting on.
We are also waiting on proper fittings for our chiller. In the meantime I'm using the HLT as a chiller. It works but it's slow. That means it takes an extraordinarily long time to get the boiled wort (after it finally DOES boil,) down to pitching temp.
Of course the chilling situation doesn't really have any effect on our pre-boil efficiency. I've been getting around 75% on the big tanks brewing half batches. I'd like to see a better number obviously. I'm planning on sitting in with another local brewer this weekend and watching him brew to see if I can pick up on anything and maybe find where I'm making some mistakes.
Another part of our overall inefficiency which will just take time to work out and get better with is understanding our tanks and hoses. We haven't hard-plumbed yet because we want to make sure we're happy with where everything is at. So we're moving transfer hoses everywhere, some of which are pretty long and therefore fill up with lots of beer. So at the end of a brew day we end up losing a fair amount of beer in the hoses along with a good chunk in the bottom of the BK and the Mash Tun that didn't quite come out while we were transferring.
So, with our 10 bbl system doing a 1/2 batch we lose 20 or 30 gallons of beer along with what we are going to lose in the fermenters which kinda sucks. You know... The suck. Just stuff we have to learn and get better with as we brew more and more batches. New equipment, that sort of thing.
So, all that said...
Scaling up, I based my scaling on a "guessed" efficiency. I guessed 75% for my first batch because I wanted to be really conservative. I wasn't far off. ;-) I simply scaled up THE GRAIN VALUES from my old tried and true 5 gallon recipes based on the efficiency scale.
As a result I ended up hitting my numbers right on with my first brew. My second was off by a fair bit though and I had to fix it with DME. My third and fourth batches were dead on however. So it seems that method worked alright for me.
So what I'm saying is that I didn't seem to have any problems scaling up my MALT linearly using efficiency and my expected output.
Now, hops is an entirely different critter.
I just used the formulae below to figure out my hops. It seems pretty accurate and compared to the Pro Mash is very close (although Pro Mash comes in just a little lower in IBUs which I personally think is wrong. Don't hate me. I know I'm new...)
You probably recognize this formula, it's pretty standard for calculating IBUs
AAU = Hops AA * Weight
U = Time in boil [Minutes] cross referenced by F [factor determined by wort gravity]
CC = Metric Conversion Constant [75]
V = Volume of boiled wort to which hops is exposed
IBU = (AAU * U * CC) / V
* Note, I use full boils. This calculation doesn't work with the "Hop Tea and Lauter" method. That's a different calculation.
I assume most of you have the table that shows the U(tilizatioin) factors. This works pretty well and showed immediately why some of my pilot system batches were really low on the hops bite. I was just doing linear scaling on an IPA from 5 gallons to 40 and that was really really wrong.
I built a spreadsheet that shows you immediately where you need to up your various values to get the right IBUs you want. It also shows you how to get the right additions from the bittering, flavor and aroma additions to match your original design from the smaller batch.
So, for what it's worth. I hope that answers some questions. I'm still working on efficiency. It seems as though Malt scales fairly well, hops not so much. But, Damn if those math teachers weren't on to something. You really CAN use it in everyday life.