Heat Value of Refuse Ultimate analysis Using the chemical makeup of the fuel to approximate its heat value Bib=145c+620H-0)+40s Bu/1b=144C+672H+6.20+41.4S-10.8N where C,H,O,S,and N are the weight percentages(dry basis)of carbon,hydrogen,oxygen,sulfur,and nitrogen,respectively UNEPHeat Value of Refuse Ultimate analysis Using the chemical makeup of the fuel to approximate its heat value where C, H, O, S, and N are the weight percentages (dry basis) of carbon, hydrogen, oxygen, sulfur, and nitrogen, respectively