Comprehensive Evaluation Method of ORC System Performance Based on the Multi-Objective Optimization

Abstract:

The choice of evaluating indicator has a most important influence on the performance analysis and optimization of Organic Rankine-cycle (ORC) system. In this paper, the net output power of unit mass of exhaust gas (), the cycle exergy efficiency (), the total waste heat emissions () and the product of exchanger's area and total heat transfer coefficient () are selected as the four key indicators which can reflect the characteristics of ORC system. And then, a comprehensive evaluating indicator of ORC system performance () is obtained according to the theory of multi-objective optimization. Further, a comprehensive evaluation method of ORC system performance based on the multi-objective optimization is put forward in this paper. After that, this method is used to optimize the evaporation temperature which is considered as a key parameter of ORC system performance. According to researches, the results gained by using a single-objective optimization method with only one performance parameter as the indicator, cannot often take a global view of the ORC system performance and sometimes may lead to a deviation. Researches also show that increases firstly and then decreases with the increment of the evaporation temperature, and there exists a value of evaporation temperature to maximize . Through analysis and researches, it can be found that the comprehensive evaluation method of ORC system performance based on the multi-objective optimization provided in this paper gives a synthetic consideration to the requirements from high-efficiency, economy, thermodynamic perfection and environment protection. Moreover, by using this method, the ORC power generation system may be more likely to achieve the best comprehensive performance.

• Periodical: Advanced Materials Research (Volume 997)
• Pages: 721-727
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.997.721
• Online since: August 2014
• Authors: Liang Jiang, Ya Dong Zhu, Victor Jin, Li Jun Yu*
• Keywords: Multi-Objective Optimization (MOP), Organic Rankine-Cycle, Performance Evaluation Method, Waste Heat Power Generation

References

[1] Ze-min Jiang. Ideas for solving the energy source issues in China[J]. China Energy Source, 2008, 30(4): 5-19.

[2] Hua Wang, Hui-tao Wang. Low temperature waste heat power generation organic Rankine cycle technology[M]. Beijing: Science Press, (2010).

[3] Chao He, Chao Liu, Hong Gao, et al. The optimal evaporation temperature and working fluids for subcritical organic Rankine Cycle[J]. Energy，2012，38(1): 136-141.

DOI: 10.1016/j.energy.2011.12.022

[4] Liu B.T., Chien K.H., Wang C.C. Effect of working fluids on organic Rankine cycle for waste heat recovery[J]. Energy, 2004, 29(8): 1207-1217.

DOI: 10.1016/j.energy.2004.01.004

[5] B.V. Reddy, G. Ramkiran, K. Ashok Kumar, et al. Second law analysis of a waste heat recovery steam generator[J]. International Journal of Heat and Mass Transfer, 2002, 45: 1807–1814.

DOI: 10.1016/s0017-9310(01)00293-9

[6] C. Casarosa, A. Franco. Thermodynamic optimization of the operative parameters for the heat recovery in combined plants[J]. International Journal of Applied Thermodynamics, 2001, 4: 43–52.

[7] Khennich M., Galanis N. Thermodynamic analysis and optimization of powercycles using a finite low-temperature heat source, International Journal of Energy Research, 2011, DOI: 10. 1002/er. 1839.

DOI: 10.1002/er.1839

[8] Jiang Liang, Xu Jian, Yu Li-jun. Effects of Regenerator on Performance of Power Generation System Recovering Low-temperature Waste Heat under Supercritical Condition[J]. Journal of Engineering for Thermal Energy and Power, 2013, 28(1): 42-47.

[9] Huan-wen Tang. Introduction to practical mathematical programming[M]. Dalian: Dalian University of Technology publishing house, (1986).