where H = the percentage by weight of hydrogen.
This item is frequently considered as a part of the unaccounted for
loss, where an ultimate analysis of the fuel is not given.
(C) Loss due to heat carried away by dry chimney gases. This is
dependent upon the weight of gas per pound of coal which may be
determined by formula (16), page 158.
Loss in B. t. u. per pound = (T-t)×.24×W.
Where T and t have values as in (33),
.24 = specific heat of chimney gases,
W = weight of dry chimney gas per pound of coal.
(D) Loss due to incomplete combustion of the carbon content of the fuel,
that is, the burning of the carbon to CO instead of CO_{2}.
10,150 CO
Loss in B. t. u. per pound = C×--------- (35)
CO_{2}+CO