THERMODYNAMIC ANALYSIS AND COMPARISON OF AN ORC-OFC COMBINED POWER GENERATION SYSTEM asme-orc2015 Tracking Number 15Presentation: Session: Session 18: Advanced architectures Room: 1A Europe Session start: 14:00 Wed 14 Oct 2015 Jianyong Wang wangjy_xjtu@stu.xjtu.edu.cn Affifliation: Xi'an Jiaotong University Jiangfeng Wang jfwang@mail.xjtu.edu.cn Affifliation: Xi'an Jiaotong University Yiping Dai ypdai@mail.xjtu.edu.cn Affifliation: Xi'an Jiaotong University Topics: - System Design and Optimization (Topics), - I prefer Oral Presentation (Presentation Preference) Abstract: In this work, an ORC-OFC combined power generation system is proposed to improve the energy conversion efficiency for low grade heat sources. Mathematical models of the system are established to simulate the system under steady-state conditions. Effects of two key thermodynamic parameters including evaporation pressure and flash pressure on the system performance are examined. The analysis indicates that there exists an optimal evaporation pressure and an optimal flash pressure that yield the maximal net power output and system exergy efficiency for the proposed system. Parameter optimizations by genetic algorithm are conducted for ORC, OFC and the proposed system under same heat source and restrictions, and the optimization results of the three systems are compared, showing that the ORC-OFC combined power generation system, with maximal exergy efficiency reaching 16.70%, performs better than the ORC and the OFC. |