how to calculate hhv of coal?
['FORMULAS FOR CALCULATING THE HEATING VALUE OF COAL AND COAL CHAR: DEVELOPMENT, TESTS AND USES. ... ', 'of the United States.', 'Four formulas were selected for test. They are as follows: ... ', 'Q = 145.44 C + 620.28 H + 40.5 S - 77.54 (0)', 'Boie (11) Q = ... ', '9 = [ ~~', '+ 424.621 [C/3 + H -(0)/8 + s/8]', 'Mott and Spooner (1,13)']