Source term of biogas production

Source term of heat production

Sink term of moisture

${\alpha }_b={\displaystyle \sum _{i=1}^{3}f\left(\omega \right)A_i{C}_b{\lambda }_i\left(T\right)\exp \left(-{\lambda }_i\left(T\right)t\right)}$

With; ${\lambda }_i\left(T\right)={\beta }_i\exp \left(-\frac{E_{ai}}{RT}\right)$

${\alpha }_q=\frac{H}{2M_b}{\alpha }_b$

${\alpha }_l=\frac{M_{{\text{H}}_{\text{2}}\text{O}}}{3.4M_b}{\alpha }_b$