Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30076
First and Second Analysis on the Reheat Organic Rankine Cycle

Authors: E. Moradimaram, H. Sayehvand

Abstract:

In recent years the increasing use of fossil fuels has led to various environmental problems including urban pollution, ozone layer depletion and acid rains. Moreover, with the increased number of industrial centers and higher consumption of these fuels, the end point of the fossil energy reserves has become more evident. Considering the environmental pollution caused by fossil fuels and their limited availability, renewable sources can be considered as the main substitute for non-renewable resources. One of these resources is the Organic Rankine Cycles (ORCs). These cycles while having high safety, have low maintenance requirements. Combining the ORCs with other systems, such as ejector and reheater will increase overall cycle efficiency. In this study, ejector and reheater are used to improve the thermal efficiency (ηth), exergy efficiency (η_ex) and net output power (w_net); therefore, the ORCs with reheater (RORCs) are proposed. A computational program has been developed to calculate the thermodynamic parameters required in Engineering Equations Solver (EES). In this program, the analysis of the first and second law in RORC is conducted, and a comparison is made between them and the ORCs with Ejector (EORC). R245fa is selected as the working fluid and water is chosen as low temperature heat source with a temperature of 95 °C and a mass transfer rate of 1 kg/s. The pressures of the second evaporator and reheater are optimized in terms of maximum exergy efficiency. The environment is at 298.15 k and at 101.325 kpa. The results indicate that the thermodynamic parameters in the RORC have improved compared to EORC.

Keywords: Organic rankine cycle, organic rankine cycle with reheater, organic rankine cycle with ejector, exergy efficiency.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3298942

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 125

References:


[1] F. Heberle, M. Preibinger, D. Bruggemann, 2012. Zeotropic mixtures as working fluids in Organic Rankine Cycles for low-enthalpy geothermal resources, Renewable Energy, Vol. 37, No. 1, pp. 264-370.
[2] Q. Chen, J. Xu, H. Chen, 2012. A new design method for Organic Rankine Cycles with constraint of inlet and outlet heat carrier fluid temperatures coupling with the heat source , Applied Energy , Vol. 98, , pp.562-573.
[3] M. Chys, M. van den Broek, B. Vanslambrouck, M. De Paepe, 2012. Potential of zeotropic mixtures as working fluids in organic Rankine cycles, Energy,Vol. 44, No. 1, pp. 623-632.
[4] W. Li, X. Feng, L. J. Yu, J. Xu, 2011, Effects of evaporating temperature and internal heat exchanger on organic Rankine cycle. Applied Thermal Engineering, Vol. 31, No. 17-18, pp. 4014-4023.
[5] Drescher, U. & Brüggemann, D., 2007. Fluid selection for the Organic Rankine Cycle (ORC) in biomass power and heat plants. Applied Thermal Engineering, 27(1), pp.223–228.
[6] Alireza Javanshir, Nenad Sarunac, Zahra Razzaghpanah, 2017. Thermodynamic analysis of a regenerative organic Rankine cycle using dry fluids. Applied Thermal Engineering,
[7] Roy J.P., Mishra M.K., Misra A, 2012. Parametric optimization and performance analysis a regenerative Organic Rankine Cycle using R-123 for waste heat recovery. Energy, 35, 5049–5062.
[8] Hanzhi Wang, Huashan Li, Lingbao Wang, Xianbiao Bu, 2017. Thermodynamic Analysis of Organic Rankine Cycle with Hydrofluoroethers as Working Fluids. Energy Procedia, 105 1889 – 1894.
[9] Milad Ashouri, Mohammad H. Ahmadi, S. Mohsen Pourkiaei, Fatemeh Razi Astaraei, Roghaye Ghasempour, Tingzhen Ming, Javid Haj Hemati, 2017. Exergy and Exergo-economic analysis and optimization of a solar double pressure organic Rankine cycle. Thermal Science and Engineering Progress,
[10] Long Shao, Jie Zhu, Xiangrui Meng, Xinli Wei, Xinling Ma, 2017. Experimental study of an organic Rankine cycle system with radial inflow turbine and R123. Applied Thermal Engineering.
[11] Roshaan Mudasar, Faraz Aziz, Man-Hoe Kim, 2017. Thermodynamic analysis of organic Rankine cycle used for flue gases from biogas combustion, Energy Conversion and Management 153 627–640.
[12] Kuo-Cheng Pang, Shih-Chi Chen, Tzu-Chen Hung, Yong-Qiang Feng, Shih-Cheng Yang, Kin-Wah Wong, Jaw-Ren Lin, 2017. Experimental study on organic Rankine cycle utilizing R245fa, R123 and their mixtures to investigate the maximum power generation from low-grade heat, Energy
[13] Maria E. Mondejar, Jesper G. Andersen, Maria Regidor, Stefano Riva, Georgios Kontogergis, Giacome Persico and Fredrik Haglind, 2017 Prospects of the use of nanofluids as working fluids for organic Rankine cycle power system, Energy Procedia, 129 160-167.
[14] Mago, P, Charma, L.M., Srinivasan, K., Somayaji, C., 2008. An examination of regenerative organic Rankine cycles using dry fluids, Applied Thermal Engineering, Vol. 28, No. 8-9, pp. 998-1007.
[15] Gu, ZL, Sato H., 2001. Optimization of cyclic parameters of a supercritical cycle for geothermal power generation. Energy Convers Manage; 42(12):1409–16.
[16] Wang, D.X., Ling, X., Peng, H., Liu, L., Tao, L.L., 2013. Efficiency and optimal performance evaluation of organic Rankine cycle for low grade waste heat power generation. Energy, 1–10.
[17] Mikielewicz, D., Mikielewicz, J., 2010. A thermodynamic criterion for selection of working fluid for subcritical and supercritical domestic micro CHP, Applied Thermal Engineering, Vol. 30, No. 16, pp. 2357 2362.
[18] Sun, F. et al., 2012. Optimization design and exergy analysis of organic rankine cycle in ocean thermal energy conversion. Applied Ocean Research, 35, 38–46.
[19] Li, X.G., Zhao, C.C., Hu, X.C., 2012. Thermodynamic analysis of Organic Rankine Cycle with Ejector.Sol. Energy, 42, 342–349.
[20] Li, L., Ge, T, Y., Tassou, S,A., 2017. Experimental study on a small-scale R245fa organic Rankine cycle system for low-grade thermal energy recovery, Energy Procedia, 105 1827 – 1832
[21] Xinlei Zhou., Ping Cuia., Xiaoying Wang., Lixia He., 2017. Thermal Investigations into an Organic Rankine Cycle (ORC) System Utilizing Low Grade Waste Heat Sources, Procedia Engineering 205 4142–4148.