## 3 Results
### The Influence of High Heating Temperature on the Results  
The first examined parameter is the high heating temperature, which is a critical design parameter. Very high temperatures (above 130 \({}^{\circ}\)C) lead to manufacturing restrictions and increased costs. However, according to Figure 4, the increase of this parameter increases electricity production from the ORC for both scenarios (trigeneration and cogeneration). This is a reasonable result in accordance with the \"Carnot rule\", which indicates that greater cycle temperature leads to higher cycle thermodynamic efficiency. Figure 5 also validates the aforementioned analysis. Recall that the data about the trigeneration and cogeneration scenarios appear in Table 1. The ORC performance is higher for the cogeneration scenario because of the lower ambient temperature for this case (winter with \(T_{am}\) = 10 \({}^{\circ}\)C). It is worthwhile mentioning that when the high heating temperature increases from 80 \({}^{\circ}\)C to 200 \({}^{\circ}\)C, the ORC efficiency increases from 7.47% to 21.90% for the trigeneration scenario and from 10.46% to 23.99% for the cogeneration scenario. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameter** & **Symbol** & **Value** \\ \hline \multicolumn{3}{c}{**Heat Pump**} \\ \hline Compressor’s isentropic efficiency & \(\eta_{ls,C}\) & 80\% \\ Temperature difference on the HEX & \(\Delta T_{HEX}\) & 5 K \\ Temperature difference & \(\Delta T\) & 5 K \\ Shaft mechanical efficiency & \(\eta_{m}\) & 99\% \\ Low temperature & \(T_{low}\) & \(-5\) \({}^{\circ}\)C \\ Input temperature from ambient & \(T_{int-am}\) & \(Tam+\Delta T=20\) \({}^{\circ}\)C \\ Medium temperature & \(T_{med}\) & 55 \({}^{\circ}\)C \\ High temperature & \(T_{high}\) & 120 \({}^{\circ}\)C \\ \hline \multicolumn{3}{c}{**Storage Systems**} \\ \hline Cooling stored temperature & \(T_{cool}\) & \(T_{low}-\Delta T=0\) \({}^{\circ}\)C \\ Medium stored temperature & \(T_{heat,m}\) & \(T_{med}-\Delta T=50\) \({}^{\circ}\)C \\ High stored temperature & \(T_{heat,h}\) & \(T_{high}-\Delta T=115\) \({}^{\circ}\)C \\ \hline \multicolumn{3}{c}{**ORC**} \\ \hline Superheating & \(\Delta T_{sh}\) & 5 K \\ Turbine isentropic efficiency & \(\eta_{ls,T}\) & 80\% \\ Pinch point & \(PP\) & 5 K \\ Pump isentropic efficiency & \(\eta_{ls,P}\) & 85\% \\ Saturation temperature & \(T_{sat}\) & (\(T_{heat,h}\)-\(\Delta T_{sh}\)-PP) \({}^{\circ}\)C \\ Electromechanical efficiency & \(\eta_{mg}\) & 97\% \\ Recuperator temperature difference & \(\Delta T_{mc}\) & 5 K \\ Motor-pump efficiency & \(\eta_{motor}\) & 80\% \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Input parameters for the simulation. Figure 4: The impact of high heating temperature on ORC electricity production for both trigeneration and cogeneration scenarios. Figure 5: The impact of high heating temperature on ORC efficiency for both trigeneration and cogeneration scenarios. The next studied parameter is the system exergy efficiency, shown in Figure 6. The exergy efficiency of the trigeneration scenario is maximized for \(T_{heat,h}\) = 115 \({}^{\circ}\)C at 45.28%, while for the cogeneration scenario, it is maximized for \(T_{heat,h}\) = 125 \({}^{\circ}\)C at 45.17%. The global maximum exergy performance of the trigeneration scenario is greater than the respective value of the cogeneration because there is better exploitation of the input electricity when there are three useful outputs. Moreover, it can be said that for temperature levels up to 135 \({}^{\circ}\)C, trigeneration has higher exergy efficiency, but after this limit, the cogeneration scenario is more efficient. Figure 7 depicts the system energy efficiency for both of the examined scenarios. The energy efficiency of the system takes values above 100% because the present system acts, partially, as a heat pump and thus it is thermodynamically possible to achieve these high values. The trigeneration unit has greater energy efficiency than the cogeneration system because in the trigeneration system there are more useful products.