Hi all, Im keen to try a BIAB step mash using hot water additions. Ive tried it once before by ramping the mash temp whilst slightly raising the bag, but I found that it took 15-20 minutes to get from 50C up to 66C and was difficult to accurately hit my final mash temp, as the bag was partially hoisted (to avoid burning) which made it difficult to stir the mash thoroughly and meant I had to take a temp reading from the wort outside the bag. When I reached my temp, turned off the gas and lowered the bag and stirred, the mash temp dropped a bit as the grains in the bag absorbed some of the heat from the wort .
So this time I want to try stepping up by adding boiling water. I usually mash in with 37L, and am hoping someone can point me in the direction of a calculator to work out how much boiling water to add to my first 50C step, in order to end up with 37L total @66C??
Ie.. (X litres @ 50C) + (Y Litres @ 100C (boiling water)) = 37 Litres @ 66C..solve for X and Y !
Hoping someone can point me in the right directionIm guessing it would be somewhere around 28L and 9L and will fine tune my volumes over a few brews, but I dont want to use trial and error if there is a simple calculation that will get me close to the mark first time!