When batch sparging the idea to use 2 x equal quantities of liquor. I understand the adjustments that have to made for the 1st batch with the grains retaining mash liquor and the dead space at the bottom of the tun.
What I'd like to know is, the wort lost to the hops (about 3L) and the amount lost to evaporation in the boil; is this collected when batch sparging or do you top up with liquor in the boiler?
I'm hoping to get a barley wine on over the next week and would like to maybe just run off one batch from the mash tun to get the high gravity wort. As its only a 15L brew this may be possible in a 30L mash tun with just over 5kg of grains. If I have to collect extra wort to compensate for the losses at the end of the boil then its debatable if I can do it in one batch as this adds about 7L to the sparge volume.
Quantities for Batch Sparging
