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. 2020 Dec 2;6(12):e05607. doi: 10.1016/j.heliyon.2020.e05607

Table 9.

Indirect calculation of higher heating value (HHV) [MJ/kg] by proximate analysis. Source: Authors.

Correlation of Sheng and Azevedo Heating value Correlation coefficient
19.9140.2324%Ash 18.607 0.625