## 3 Results  
Using the iterative method, the values of the minimum temperatures of the exhaust gases were calculated, which allowed the dehydrogenation process of the two LOHC+ to be triggered. The following Tables 6 and 7 show the obtained values of temperature \(T_{exh}\) and the values of \(c_{p,exh}\) (which were previously expressed as a function of the unknown parameter \(T_{exh}\)), as well as the enthalpies exploited in the balance for different LOHC+ compounds. The specific heat values are acquired after obtaining the \(T_{exh}\) value, which satisfies the heat balance equation. From the numerical values of the tables, it can be noted that the \(T_{exh}\) necessary for the dehydrogenation of H18-DBT are higher than those for dehydrogenation of H12-NEC; this could also be understood from the difference between the enthalpies of the dehydrogenation of the two compounds. Another critical observation lies in the fact that the \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Parameters**} & **Case 1** & **Case 2** & **Case 3** & **Case 4** \\  & **(100\% H\({}_{2}\))** & **(75\% H\({}_{2}\) + 25\% & **(50\% H\({}_{2}\) +50\% & **(25\% H\({}_{2}\) + 75\% \\  & & **CH\({}_{4}\))** & **CH\({}_{4}\))** & **CH\({}_{4}\))** \\ \hline \(c_{p,exh}\) & 1.606 kJ/(kg K) & 1.301 kJ/(kg K) & 1.324 kJ/(kg K) & 1.280 kJ/(kg K) \\ \hline \(T_{exh}\) & 1150 K & 875 K & 710 K & 630 K \\ \hline \(\Delta\)_h_= \(c_{p,exh}\)\({}^{*}\Delta T\) & 926.56 kJ/kg & 392.84 kJ/kg & 181.237 kJ/kg & 72.75 kJ/kg \\ \hline \(T_{exh}\) = 573.15 K, \(\Delta\)_h\({}_{exh}\)_ = 65.4 kJ/mol H\({}_{2}\) (32,700 kJ/kg H\({}_{2}\)). & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Calculated values for H18-DBT. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Parameters**} & **Case 1** & **Case 2** & **Case 3** & **Case 4** \\  & **(100\% H\({}_{2}\))** & **(75\% H\({}_{2}\) + 25\% & **(50\% H\({}_{2}\) + 50\% & **(25\% H\({}_{2}\) + 75\% \\  & & **CH\({}_{4}\))** & **CH\({}_{4}\))** & **CH\({}_{4}\))** \\ \hline \(c_{p,exh}\) & 1.547 kJ/(kg K) & 1.271 kJ/(kg K) & 1.302 kJ/(kg K) & 1.263 kJ/(kg K) \\ \hline \(T_{exh}\) & 990 K & 770 K & 640 K & 575 K \\ \hline \(\Delta\)_h_ = \(c_{p,exh}\)\({}^{*}\Delta T\) & 706.79 kJ/kg & 301.135 kJ/kg & 139.16 kJ/kg & 52.866 kJ/kg \\ \hline \(\overline{T_{exh}}\) & 533.15 K, \(\Delta\)_h\({}_{exh}\)_ = 50 kJ/mol H\({}_{2}\) (25,000 kJ/kg H\({}_{2}\)). & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Calculated values for H12-NEC. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Parameter**} & **Value** & **Parameter** & **Value** & **Parameter** & **Value** \\ \hline \(Vf_{\text{H}_{2}}\) & 0.25 & HCV & 59.1 MJ/kg & \(T_{mix}\) & 20\({}^{\circ}\) \\ \(Vf_{\text{CO}}\) & 0 & LCV & 52.8 MJ/kg & \(P_{air,gasline}\) & 1.225 kg/m\({}^{3}\) \\ \(Vf_{\text{CH}_{4}}\) & 0.75 & \(K_{gas}/\alpha_{s}\) & 2.951 & \(P_{air,gas}\) & 1.053 kg/m\({}^{3}\) \\ \(Vf_{\text{N}_{2}}\) & 0 & \(K_{gasline}/\alpha_{s}\) & 3 & \(p\) & 1 atm \\ \(Vf_{\text{CO}_{2}}\) & 0 & \(\alpha_{s}\) & 17.893 & \(P_{air,partial}\) & 0.8975 bar \\ Syngas & 0.5580 kg/m\({}^{3}\) & \(X_{syngas/total}\) & 0.114 & \(P_{icy,syngas}/P_{i,gasline}\) & 0.845 \\ Density & & & & & \\ \hline \hline \end{tabular} \(Vf=\) Volume fraction, HCV = Higher Calorific Value, LCV = Lower Calorific Value, \(X=\) Mole Ratio.  
\end{table} 
Table 5: Data for Case 4. \(T_{exh}\) decrease as the volumetric fraction of CH\({}_{4}\) increases; in the case of H18-DBT, starting from a value of 1150 K (100% H\({}_{2}\)) and arriving at a minimum of 630 K (25% H\({}_{2}\)), while choosing H12-NEC as the compound, the values will be, respectively, 990 K (100% H\({}_{2}\)) and 575 K (25% H\({}_{2}\)). In this regard, it is possible to draw a graph that precisely describes the trend of \(T_{exh}\) as a function of the volumetric fraction of H\({}_{2}\). Figure 2 shows the calculated \(T_{exh}\) values for H18-DBT and H12-NEC with changes in the hydrogen ratio.