Partial boil

[Gasperus]

Hello,
n00b at brewing, but not at drinking beer Brewed few kits with "what i found at home", 40l (10.6g) chiller box, 30l (8g) fermentor and 10l (2.6g) pot. Now I just figured out to do all grain. Going to brew Cream of three crops with just Styrian Golding hops. Bigger pot is comming in few weeks time, so i came up with an idea....

Plan: 20l (5.5g) batch
-boil 4l (1g) water and put it in freezer,
-make mash with 12l (3g) water,
-boil 10l (2.6g) of wart ,
-sparge mash with 6l (1.5g) water and let wort sit for first boil of wart to finish,
-boil second wort with hops as recipe says,
-combine cold water from freezer and first wort and ahter 90min second wort,
-wait to ferment,
-bottle,
-get pissed

Question is if this plan is going to work or there is something important I missed?And thoughts about plan, hop dosage, wort sitting for 90 min, rising the temperature of wort in fermentor after adding second wort, or anything else....

Thanks!

 

[RM-MN]

The more typical way would be to mash, drain into boil pot or bucket, sparge, drain into boil pot and combine with the first amount and boil the whole batch together. If computed correctly and combined for the boil there will not be any extra water added. Any water you add after the boil simply dilutes the beer and the lesser water used for mash and sparge then would leave more sugars behind in the spent grains since you would have more saturated wort that cannot rinse out all the sugars.

If you are limited in what amount you can boil, for sure your way will work but with lowered efficiency of sugar extraction. The 90 minutes that the wort would sit should not be any problem, bacteria don't grow really fast and would be seriously hampered by the heat of the mash or sparge.