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11 Effect of superheating on ORC performance Normally it is true that having more inlet turbine temperature means more cycle efficiency. In some cycles with wet fluid (Refer to A2‐ definition of terms), super heating is essential in order to keep the expansion in vapor phase and to prevent wet expansion and erosion in turbine. Since most ORCs use dry fluids, having excessive superheating is proven to have negative effect on maximum working pressure, saturation temperature and performance of the cycle. This is shown in Yiping Dai, Jiangfeng Wang, Lin Gao (2009).43 To reassess their findings and to check consistency of established EES model with previous findings, result of investigation is plotted and shown in Figure 22. This figure is in good consistency with previous findings and indicates that excessive superheating have negative effect on total efficiency of ORC. (Please refer to appendix for definition of Dry, wet, isentropic fluids and pinch point temperature). For calculating total efficiency (thermal efficiency) in the model, equation 1 is used. Wnet means net produced power from cycle and Qeva stands for heat input from heat source to evaporator. Equation 1: Figure 22: Superheating effect on total efficiency and work out put 43 Yiping Dai, Jiangfeng Wang, Lin Gao. Parametric optimization and comparative study of organic Rankine cycle (ORC) for low grade waste heat recovery. Energy conversion management 2009; 50: 576‐582. 51PDF Image | Exergy
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