cmbrougham
Grandmaster Brewer
Previously, I only did AG mashes in my cooler-based MLT, and the MLT and grain are kept out in my garage, which during the winter puts them both around 35-40dF. In that case, I use the "Adjust Temp for Equipment" checkbox in the Mash tab to account for these temperatures, and to get the strike water at the right temperature for my desired mash temperature. The "Adjust Temp" checkbox seems to utilize both mash tun temperature and grain temperature (both under "Mash Initial Conditions") in calculation of strike temp. So far, so good.
I've done several BIAB batches now, and have consistently been missing (usually by overshooting) my desired mash temp by 1-3dF, depending on how cold the grain was and whether I'm mashing for light, medium or full body. As before, I'm using "Adjust Temp" checkbox along with my grain temp; however, I'm leaving "Mash Tun Temperature" at the default, which I believe is 72dF in the shipping profiles. Really, though, this is incorrect: my mash tun, which is the kettle I'm using to BIAB, is at the same temperature (or near to it) as the water being heated within it.
So, what's the correct way to deal with this? I'd be tempted to call this a bug, since it would seem that the initial MT temperature shouldn't be a factor in calculating strike temp when doing BIAB, but I suppose there are some who do a hybrid-BIAB and use something like a cooler to mash in along with the bag. In my mind, if I've selected the "BIAB Mash with Full Boil" in the Mash Profile designer, the MT temperature should be discounted from the strike temp calculation. I suppose I can fake it by punching in a Mash Tun Temperature that is a few degrees higher than my desired strike temperature, but this seems a bit... dodgy. I actually did this on a BIAB batch I did yesterday, and got much closer to my desired mash temp.
Thoughts are appreciated.
I've done several BIAB batches now, and have consistently been missing (usually by overshooting) my desired mash temp by 1-3dF, depending on how cold the grain was and whether I'm mashing for light, medium or full body. As before, I'm using "Adjust Temp" checkbox along with my grain temp; however, I'm leaving "Mash Tun Temperature" at the default, which I believe is 72dF in the shipping profiles. Really, though, this is incorrect: my mash tun, which is the kettle I'm using to BIAB, is at the same temperature (or near to it) as the water being heated within it.
So, what's the correct way to deal with this? I'd be tempted to call this a bug, since it would seem that the initial MT temperature shouldn't be a factor in calculating strike temp when doing BIAB, but I suppose there are some who do a hybrid-BIAB and use something like a cooler to mash in along with the bag. In my mind, if I've selected the "BIAB Mash with Full Boil" in the Mash Profile designer, the MT temperature should be discounted from the strike temp calculation. I suppose I can fake it by punching in a Mash Tun Temperature that is a few degrees higher than my desired strike temperature, but this seems a bit... dodgy. I actually did this on a BIAB batch I did yesterday, and got much closer to my desired mash temp.
Thoughts are appreciated.