Grainfather - deadspace

[MarkF_2703]

I get almost the same:

Pre-boil = (23 +2.5)/.96 = 26.56(post-boil before shrinkage) + 4.5 = 31.06L
Mash volume = 17L
Sparge = 31.06 - 17 + (5 x 1.1) = 19.56

Total liquor = 17 + 19.56 = 36.56L

We are a liter adrift for some reason, not sure I follow the /.96 bit? I am working on a 50ml evap per minute which should equate to 3l an hour in the boil, so I can have the boil time as a variable on the spreadsheet. I am working the 4% shrinkage out after the evaporation of 3.5litres, was never good at maths at school and that was an awful long time ago.

(23+2.5)*4% gives shrinkage of 1.02 litres plus 3.5 evap so 23+2.5+1.02+3.5=30.02 I may be confused here

Any minute now I am going to feel a right idiot

Yes, the 0.96 is the shrinkage. It shrinks from 26.56 to 25.5. So the shrinkage is 1.06L

Ah okay, see where we differ now, I have 3.5 litre evaporation for a 70 min boil working on 3 litres per hour evap rate.

Thanks Dave