Optimization of Solar Rankine Cycle by Exergy Analysis and Genetic Algorithm
Nowadays, solar energy is used for energy purposes such as the use of thermal energy for domestic, industrial and power applications, as well as the conversion of the sunlight into electricity by photovoltaic cells. In this study, the thermodynamic simulation of the solar Rankin cycle with phase change material (paraffin) was first studied. Then energy and exergy analyses were performed. For optimization, a single and multi-objective genetic optimization algorithm to maximize thermal and exergy efficiency was used. The parameters discussed in this paper included the effects of input pressure on turbines, input mass flow to turbines, the surface of converters and collector angles on thermal and exergy efficiency. In the organic Rankin cycle, where solar energy is used as input energy, the fluid selection is considered as a necessary factor to achieve reliable and efficient operation. Therefore, silicon oil is selected for a high-temperature cycle and water for a low-temperature cycle as an operating fluid. The results showed that increasing the mass flow to turbines 1 and 2 would increase thermal efficiency, while it reduces and increases the exergy efficiency in turbines 1 and 2, respectively. Increasing the inlet pressure to the turbine 1 decreases the thermal and exergy efficiency, and increasing the inlet pressure to the turbine 2 increases the thermal efficiency and exergy efficiency. Also, increasing the angle of the collector increased thermal efficiency and exergy. The thermal efficiency of the system was 22.3% which improves to 33.2 and 27.2% in single-objective and multi-objective optimization, respectively. Also, the exergy efficiency of the system was 1.33% which has been improved to 1.719 and 1.529% in single-objective and multi-objective optimization, respectively. These results showed that the thermal and exergy efficiency in a single-objective optimization is greater than the multi-objective optimization.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3461974Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 310
 S. E. Hosseini, A. M. Andwari, M. A. Wahid, G. Bagheri, S. Ehsan, A. Mahmoudzadeh, and M. Abdul, “A review on green energy potentials in Iran,” Renew. Sustain. Energy Rev., vol. 27, pp. 533–545, Nov. 2013.
 M. Vafaeipour, S. Hashemkhani Zolfani, M. H. Morshed Varzandeh, A. Derakhti, and M. Keshavarz Eshkalag, “Assessment of regions priority for implementation of solar projects in Iran: New application of a hybrid multi-criteria decision making approach,” Energy Convers. Manag., vol. 86, pp. 653–663, Oct. 2014.
 R. Hosseini, M. Soltani, and G. Valizadeh, “Technical and economic assessment of the integrated solar combined cycle power plants in Iran,” Renew. Energy, vol. 30, no. 10, pp. 1541–1555, Aug. 2005.
 G. Franchini, A. Perdichizzi, S. Ravelli and G. Barigozzi, “A comparative study between parabolic trough and solar tower technologies in Solar Rankine Cycle and Integrated Solar Combined Cycle plants”, Sol Energy, vol. 98, pp. 302–14, Dec. 2013.
 B. Twomey, P. A. Jacobs and H. Gurgenci, “Dynamic performance estimation of small-scale solar cogeneration with an organic Rankine cycle using a scroll expander”, Appl Therm Eng, vol. 51, pp. 1307–16, Mar. 2013.
 C. Tzivanidis, E. Bellos and K. A. Antonopoulos, “Energetic and financial investigation of a stand-alone solar-thermal Organic Rankine Cycle power plant”, Energy Convers Manag, vol. 126, pp. 421-33, Oct. 2016.
 O. Aboelwafaa, K. F. Seif-Eddeen, S. Ahmed and M. I. Ibrahim, “A review on solar Rankine cycles: Working fluids, applications, and cycle Modifications”, Renew. Sustain. Energy Rev, vol. 82, pp. 868–885, Feb. 2018.
 S. H. R. Mishra and Y. Khan, “Exergy and energy analysis of modified organic Rankine cycle for reduction of global warming and ozone depletion”, IJREI, vol. 1, no. 3, pp. 1-12, Jan. 2017.
 Z. Ahmed, K. D. Mahanta, “Optimization of an organic Rankine cycle in energy recovery from exhaust gases of a diesel engine”, IJMET, vol. 5, no. 12, pp. 97-109, Dec. 2014.
 E. Ghasemian and M. A. Ehyaei, “Evaluation and optimization of organic Rankine cycle (ORC) with algorithms NSGA-II, MOPSO, and MOEA for eight coolant fluids”, Int J Energy Environ Eng, vol. 9, pp. 39-57, Oct. 2017.
 L. Jing, P. Gang and J. Jie, “Optimization of low temperature solar thermal electric generation with Organic Rankine Cycle in different areas”, Appl. Energy, vol. 87, pp. 3355-65, Nov. 2010.
 P. Gang, L. Jing and J. Jie, “Design and analysis of a novel low-temperature solar thermal electric system with two-stage collectors and heat storage units”, Renew Energy, vol. 36, pp. 2324–33, Sep. 2011.
 W. J. Yang, C. H. Kuo and O. Aydin, “A hybrid power generation system: solar-driven Rankine engine-hydrogen storage”, Int J Energy Res, vol. 25, pp. 1107–25, Jun. 2001.
 S. A. Kalogirou, “Solar thermal collectors and applications”, Prog. Energy Combust. Sci., Vol. 30, no. 3, Apr. 2004.
 A. Mokhtari, A. Koppel, G. Scutari, and A. Ribeiro, “Large-scale nonconvexstochastic optimization by doubly stochastic successive convex approximation”, in Acoustics, Speech and Signal Processing (ICASSP), 2017 IEEE International Conference on, pp. 4701–4705.
 T. L. Bergman, A. S. Lavine, F. P. Incropera, D. P. Dewitt, D.P., 2011. Fundamentals of Heat and Mass Transfer, sixth ed. John Wiley Publications, New Jersey, 2011.
 H. Hajabdollahi, "Evaluation of cooling and thermal energy storage tanks in optimization of multi-generation system", J. Energy Storage, Vol. 4, pp. 1-13, Dec. 2015.
 Y. A. Cengel, M. A. Boles, “thermodynamics: an engineering approach”, 4th ed. New York, NY: McGraw-Hill, 2002.