![]() ![]() ![]() My main issue is the wide range of pH results from base malts in general and the programs sort of lumping them all into one category. There does seem to be a difference with the way they calculate the acid contributions, but neither is really too far off the mark that it is unusable. At this same acid content of the malt, Bru'n water ended up well below my actual results. In the end, I calculated that increasing the acid content value of the malt to a little above 3% brought the pH prediction from BeerSmith into alignment with my actual results. Overall, it seems like all of the water adjustment tools are lacking somewhat when it comes to the use of acidulated malt. You can see my analysis of a pilsner recipe which I had brewed a couple of times and measured pH with and without acidulated malt on this thread: so I always recommend actually measuring your mash pH and adjusting again if needed. In the real world a lot of factors come into play that we don't really know including the actual acidity of each grain addition, the precise composition of your water, crush of the grain, etc. That being said - these are models folks. When using any model, I do the research first and pick the best one I can find which I did in this case. If you read the paper and understand the chemistry involved, you will see why the other models have problems and why I went with the one I did. I've already had a number of people ask me why didn't I just make my model match the BNW (or EZ Water, or KW or pick your favorite tool)? ![]() This is a pretty significant problem with BNW - not the other tools. In fact it calculates almost double the acidity change (which means half the acid needed) for the particular comparison case with phosphoric that the other water tools or models did. If you go to page 7 you will see the acidity delta in the table changes pretty dramatically with BNW for phosphoric, meaning it will calculate a lot less phosphoric. BeerSmith uses the model described in the paper which does include the effects of acid density: I've discussed this in other threads, but the here's a comparison of the models (page 7). BNW ignores the acid density which has a particularly large effect when using phosphoric acid. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |