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extract brewing - equipment setup

mtriplett

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Greetings.

A couple questions regarding equipment profile setup for extract brewing (ie, 'type' is selected to extract):

1)  Am I correct that 'brewhouse efficiency' has no effect on OG, IBU, SRM & ABV?
2)  I'm playing around with a couple different profile setups and their effects on batch calculations.  The first is 8.00gal boil volume w/ 2.00 gal boil off and 0.00gal trub loss.  The second is 8.00gal boil volume w/ 1.50gal boil off and 0.50gal trub loss.  Why does the change in ratio between boil off and trub loss (ie, changing 2.00gal:0.00gal to 1.50gal:0.50gal) only affect IBU and SRM but not OG/ABV?  Shouldn't OG/ABV also be affected because the wort is more concentrated in a 2.00gal:0.00gal ratio and less concentrated in a 1.50gal:0.50gal ratio?

Again, this is for extract brewing.

Thanks.
 
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