It is typically measured with a hydrometer or refractometer in the fermenter when brewing is complete but before fermentation has started. Original gravity is a measure of the sugars dissolved in the water in your unfermented wort. This week we’ll cover how to estimate OG by hand, though in practice most people use brewing software to do the calculation more easily. So original gravity drives both the alcohol content and the residual body of the beer. The original gravity of a beer is a measure of the potential sugars, about 60-75% of which will be converted into alcohol during fermentation. It seems more important to adjust all the other variables like trub loss and evaporation rate than it does BHE.Follow Gravity is a key parameter for beer recipe design. Instead of asking me what I think it will be at the end, I would be more interested in BS telling me how it turned out after the brew is done. I'm already asked by BS for most of the estimated variables that go into BHE. Ultimately I think it bothers me most is that I consider BHE a read only calculation. But a brewer with a highly efficient transfer process and setup can't separate the estimates from his other steps because BHE reigns over all steps. Transfer could end up being different depending on the cooling solution and kettle design not to mention your attitude towards trub in the fermenter. If you divide the process into the 3 steps of mash, boil, and transfer then with BHE you give up the ability to fine tune each step. Yet losses from the boil and transfer steps have nothing to do with mash.Īnd I think that is the key on why it irks me. This includes things like volume losses in steps such as boil and transfer. So we take a estimated value that represents the entire process (mash, boil, transfer) and we apply it to each and every step in that process. The only thing i can figure is the BH efficiency was messing things up. The difference was 3% but it should have been exact. I even went so far as to calculate the max potential of my latest recipe and tried to use the measured gravity and volume amounts to match what BS told me and it didn't work. If you can't tell I'm very frustrated today because I'm trying to fix issues I'm having with mash efficiency with my new system and not being able to get a clear handle on the mash efficiency variable are is driving me crazy. Plus, if the user keeps brewing, it makes it easier to get help and figure things out if they start with mash efficiency. Explaining what a typical mash efficiency value might be is easier to understand than explaining the sweeping effect that BH efficiency will have. The software is confusing enough and to be honest, it is much easier to understand how the numbers work when you limit their impact to the formula. The only argument I can see in using BH efficiency is making it easier for the new user. This can show the user how inaccurate volume calculations will offset the gravity estimates. Estimated volumes and gravity values should also include the efficiency numbers along side. A user should be able to see the max points for each recipe. The points for each recipe can easily be calculated by they are hidden. This includes all the factors that go into the mash efficiency calculation. If mash efficiency were entered by the user I think it would also make sense to bring the other variables related to the mash forward so the user can see them. Mash efficiency is such a key component it deserves to be the value you enter yourself and not something that is backed into. The predicted results shouldn't be from the generic BH efficiency but instead driven from the mash efficiency which sets the tone for the rest of the process. And before anyone can help with that process they need to know all the numbers associated with your mash process.īecause BS lets the user control the BH Efficiency they lose control over the critical mash efficiency. Forums are flooded with questions on the mash process. In this hobby, as soon as someone starts asking questions about their brewing process the first thing they realize is how important the mash process is.
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