First-wort-hop utilisation bonus, as a multiplier on a full-boil addition.
FWH is modelled as a boil addition for the entire boil, times 1.10. This is
the convention BeerSmith and Brewer's Friend use, itself derived from the
1995 Brauwelt trials that reported ~10 % more measured bitterness from
first-wort hopping than from an equivalent 60-minute addition.
First-wort-hop utilisation bonus, as a multiplier on a full-boil addition.
FWH is modelled as a boil addition for the entire boil, times 1.10. This is the convention BeerSmith and Brewer's Friend use, itself derived from the 1995 Brauwelt trials that reported ~10 % more measured bitterness from first-wort hopping than from an equivalent 60-minute addition.