request for the function of the minimum water level in the mash tun

[Jazzbeerman]

Hello, it's me again, I have a suggestion. which would make life easier for those who use equipment with a false bottom (filter screen). For example, in my 50 L mash tun, the volume under the screen is 13.5 L! Yes, that's a lot.
Of course, this feature is not mandatory. (but maybe in some future version...) The only significant benefit from it is the elimination of errors in the calculations of the erasure scheme. And yet, knowing the minimum amount of water, it will be possible to see honest information about the ratio of water to grain during a mash.

[matty0ung]

Sorry for the slow response.
I think I see roughly what you're getting at. I didn't understand the bit about the "erasure scheme" though. (Something lost in translation perhaps?) Could you give an example or two about which calculations would be different with the additional information?

[Jazzbeerman]

Hello! Haha, I should have checked my text before translating it!
Yes, talking about the mash profile.
For example, I have a 50L tun, it has a mesh screen (false bottom) for filtering. The screen is at a distance from the bottom, and 13.5L water is placed in this volume. It would be cool if I could enter this volume as required. Then there will be no possible error when there is not enough water, due to the fact that most of it has gone to the bottom of the screen. Now I check it manually. This is just a small suggestion for the convenience of those who use this type of filter in their mash tun.

[mikfire]

Have you looked on the equipment profile?

I believe you can use the lauter deadspace parameter (Equipment profile -> first tab). I used a Blichmann boil kettle with a false bottom in the past. I just checked that profile, and it does have that parameter set. Set that and see if it helps.

If it doesn't, you could also try manually entering the pre-boil volume parameter. In this case I believe "pre-boil" means the total volume of water including all losses to equipment, boil off ,etc. You will need to do some maths, but you will only need to do it once.

If you click on the equipment profile in the tree on the left and edit that, you will need to reassign the equipment to the recipe to see any changes. It is a side effect of how brewtarget works. I would explain, but it is long and not really relevant.

If we do add this parameter, I would suggest it be on the equipment profile.

[Jazzbeerman]

If we do add this parameter, I would suggest it be on the equipment profile.

Hello! It seems yes, that's where it belongs, but I'll try to experiment with the lauter deadspace parameter. Why didn't I do it sooner? Good question! But I believe that dead space is what will be the loss. And in this case, it is the added volume.
P.S. I seem to be doing something wrong. I added lauter deadspace but nothing changed in the calculations. (In the recipe, the equipment was reset to make sure the parameters took effect) This is most likely my mistake, I will continue the experiment. But if a new parameter is added to the equipment section, which is responsible for the additional initial volume of water, it will be very good!

[Jazzbeerman]

In general, I spent a couple of brews, and returned to the problem described, while the next step of mashing was going on. What we managed to find out: the use of the lauter deadspace parameter is not correct in my case (and in general, apparently does not correspond to the task that I entrusted to it).
To more accurately describe the situation, I will take a few screenshots.
So, the lauter deadspace parameter is 0 liters.
When tasked with the first infusion step, the program offers the following:

We see that 7 kilograms of malt occupies 11,886 liters of volume, the collect wort starting position is negative. But we remember that in my case this starting volume should be 11,886+13,2=25,086 liters. But we didn't mark lauter deadspace, right? Let's add it, just in case (suddenly the sql query does not work, or something else), we will restart the program.
We are again trying to set the starting pause, but with equipment that has a lauter deadspace of 13,2 liters.

Hmm... It seems to me, or nothing has changed? The numbers pretty confidently continue to suggest that my mash tun capacity is slightly less than 12 liters. But this, of course, is not the case.

In general, in order to understand what the true ratio of water and grain is, I first have to bring the slider for the amount of water to the required values, and then look - can I add 13.2 liters of water to this amount?
And yes, perhaps my description may be a little confusing - in fact, the volume of the mash tun below the false bottom is not dead - when the mash is drained into the boiler, this volume is also involved, however, during mashing, this volume is physically separated from the grain, due to than, the ratio of water to grain is in fact greater than if the false bottom was absent.
wow, I think I finally managed to form this thought.

P.S. preboil volume for the same reason is not working for me, since all the water involved in the mashing process will merge into the boiler. Here, rather, the premash volume parameter is needed, so to speak)