## 5 Result and Discussion
### Exergy Destruction Rate
\(I_{\rm{He}}\) decreases initially; when \(T_{\rm{g1}}\) increases to 603.15 K, the optimal HTL evaporation temperature reaches the upper limit and is unsuitable for \(T_{\rm{g1}}\). \(I_{\rm{He}}\) then increases. Given that the optimal HTL evaporation temperature does not reach the upper limit initially, the variation in \(I_{\rm{Lc}}\) is small. With the increase in \(T_{\rm{g1}}\), \(I_{\rm{Lc}}\) initially decreases and later increases; given the increase in \(I_{\rm{He}}\), \(I_{\rm{Lc}}\) decreases with the increase in \(T_{\rm{g1}}\) when the optimal HTL evaporation temperature reaches the upper limit. An unchanged HTL condensation temperature corresponds to a small variation in \(I_{\rm{Lt}}\). \(I_{\rm{Lt}}\) initially decreases, then increases, and finally decreases with the increase in \(T_{\rm{g1}}\). Considering that \(I_{\rm{He}}\) decreases initially and then increases, \(I_{\rm{ce}}\), \(I_{\rm{Ht}}\), and \(I_{\rm{P}}\) increase initially and later decrease with the increase in \(T_{\rm{g1}}\). When \(T_{\rm{g1}}\) is 523.15-553.15 K, \(I_{\rm{out}}\) is maximal at higher than 16%, and \(I_{\rm{Lc}}\) is the second largest exergy destruction rate. When \(T_{\rm{g1}}\) is 558.15-623.15 K, \(I_{\rm{out}}\) decreases from 15.3% to 8.2% and becomes the second largest exergy destruction rate given the improvement of \(\eta_{\rm{g}}\) by increasing \(T_{\rm{g1}}\); \(I_{\rm{Lc}}\) is maximal at higher than 15%. When \(T_{\rm{g1}}\) is 523.15-598.15 K, \(I_{\rm{He}}\) is the third largest exergy destruction rate. However, when  
Figure 14: Effects of \(T_{\rm{g1}}\) on exergy destruction rate for the cyclopentane system. increases to 603.15 K, \(I_{\rm He}\) rapidly decreases to 4.1% and becomes the sixth largest exergy destruction rate. When \(T_{\rm g1}\) is 603.15-623.15 K, \(I_{\rm ce}\) is the third largest exergy destruction rate at higher than 7.5%. When \(T_{\rm g1}\) is 523.15-553.15 K, \(I_{\rm Lpre}\) is the fourth largest exergy destruction rate at higher than 5%; when \(T_{\rm g1}\) is 573.15-623.15 K, \(I_{\rm Lpre}\) becomes the second smallest exergy destruction rate. Given the increasing heat absorption from exhaust gas with increasing \(T_{\rm g1}\), \(I_{\rm H\rm H}\) is higher than \(I_{\rm L\rm H}\) when \(T_{\rm g1}\) is 583.15-623.15 K. Considering that the optimal HTL condensation temperature is constant, a minimal change in \(I_{\rm L\rm H}\) is observed. \(I_{\rm P}\) is the smallest exergy destruction rates of the system. Figure 16 exhibits that the optimal HTL evaporation temperature does not reach the upper limit when \(T_{\rm g1}\) is 523.15-613.15 K because benzene is used for HTL. Thus, \(\eta_{\rm g}\) is improved by increasing \(T_{\rm g1}\), and \(I_{\rm Hout}\) decreases with the increase in \(T_{\rm g1}\). When \(T_{\rm g1}\) increases to 618.15 K, the optimal HTL evaporation temperature reaches the upper limit, and \(\eta_{\rm g}\) decreases and then \(I_{\rm Hout}\) increases; when \(T_{\rm g1}\) increases to 623.15 K, \(I_{\rm Hout}\) later decreases considering the increase in \(\eta_{\rm g}\). Given the increase in \(\eta_{\rm jw}\), \(I_{\rm Lpre}\) decreases with the increase in \(T_{\rm g1}\). Considering that the optimal HTL evaporation temperature does not reach the upper limit, \(I_{\rm He}\) increases initially and later decreases with the increase in \(T_{\rm g1}\). The variation is small; when \(T_{\rm g1}\) increases to 618.15 K, the optimal HTL evaporation temperature reaches the upper limit, and \(I_{\rm He}\) decreases rapidly. The sudden changes in 618.15-623.15 K for other components are also affected by the value of the HTL evaporation temperature. With the increase in \(T_{\rm g1}\), \(I_{\rm L\rm c}\) and \(I_{\rm L\rm t}\) decrease initially and later increase. \(I_{\rm ce}\), \(I_{\rm H\rm H}\), and \(I_{\rm P}\) increase with \(T_{\rm g1}\). When \(T_{\rm g1}\) is 523.15-588.15 K, \(I_{\rm Hout}\) is the largest exergy destruction rate at higher than 15%.