TY - JOUR
T1 - Optimized performances comparison of organic Rankine cycles for low grade waste heat recovery
AU - Wang, Enhua
AU - Zhang, Hongguang
AU - Fan, Boyuan
AU - Wu, Yuting
PY - 2012/8
Y1 - 2012/8
N2 - An organic Rankine cycle (ORC) can be applied to recover the low-grade waste heat. In this paper, the performances of five different types of ORC are evaluated. These configurations include a simple ORC, an ORC with an internal heat exchanger (IHE), an ORC with an open feed organic fluid heater (OFOH), an ORC with a closed feed organic fluid heater (CFOH), and an ORC with a reheater. First, the feasible working region is defined for an ORC operating together with an internal combustion engine. Subsequently, the thermal efficiency of each ORC is maximized using a genetic algorithm. Finally, the characteristics of each ORC are analyzed and compared using a combination of the first law and second law method. Our analysis indicates that the ORC with an IHE showed the best thermodynamic performance. The ORC with an OFOH and the ORC with a CFOH are sub-optimal while the simple ORC and the ORC with a reheater are the last choice. The effects of the expander inlet pressure, the condenser outlet temperature and the expander isentropic efficiency on system performance of each ORC were also analyzed.
AB - An organic Rankine cycle (ORC) can be applied to recover the low-grade waste heat. In this paper, the performances of five different types of ORC are evaluated. These configurations include a simple ORC, an ORC with an internal heat exchanger (IHE), an ORC with an open feed organic fluid heater (OFOH), an ORC with a closed feed organic fluid heater (CFOH), and an ORC with a reheater. First, the feasible working region is defined for an ORC operating together with an internal combustion engine. Subsequently, the thermal efficiency of each ORC is maximized using a genetic algorithm. Finally, the characteristics of each ORC are analyzed and compared using a combination of the first law and second law method. Our analysis indicates that the ORC with an IHE showed the best thermodynamic performance. The ORC with an OFOH and the ORC with a CFOH are sub-optimal while the simple ORC and the ORC with a reheater are the last choice. The effects of the expander inlet pressure, the condenser outlet temperature and the expander isentropic efficiency on system performance of each ORC were also analyzed.
KW - Genetic algorithm
KW - Internal combustion engine
KW - Organic Rankine cycle
KW - Performance optimization
KW - Waste heat recovery
UR - https://www.scopus.com/pages/publications/84866026758
U2 - 10.1007/s12206-012-0603-4
DO - 10.1007/s12206-012-0603-4
M3 - Article
AN - SCOPUS:84866026758
SN - 1738-494X
VL - 26
SP - 2301
EP - 2312
JO - Journal of Mechanical Science and Technology
JF - Journal of Mechanical Science and Technology
IS - 8
ER -