These values were then compared with the measured heating values (Table 3) and illustrated in Fig. 2. It could be observed that the measured heating values were within ±5% errors and correlated well with the calculated heating values.
It could be seen that increasing amounts of glycerin led to the increase of the heating
values and the optimum glycerin-biomass ratio found in this study was 30%.
This value was also in a suitable range of the compressive strength of briquette fuel found in the previous study [14].
The obtained results indicated that the mixture of glycerin and biomass was considered feasible to be further developed as an alternative fuel.