[1] Liu Yulan, Cao Zheng, Chen Jiufa, Xiong Jian, et al. Simulation and performance analysis of organic Rankine cyclecombined heat and power system [J]. Journal of Southeast University (English Edition), 2015, 31 (4): 489-495. [doi:10.3969/j.issn.1003-7985.2015.04.010]

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Simulation and performance analysis of organic Rankine cyclecombined heat and power system()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

31

Issue:

2015 4

Page:

489-495

Research Field:

Energy and Power Engineering

Publishing date:

2015-12-30

Info

Title:

Simulation and performance analysis of organic Rankine cyclecombined heat and power system

Author(s):

Liu Yulan¹;  Cao Zheng¹;  Chen Jiufa¹;  Xiong Jian²

¹School of Energy and Environment, Southeast University, Nanjing 210096, China
²Lotusland Renewable Energy Holdings Limited, Shanghai 200233, China

Keywords:

organic Rankine cycle;  combined heat and power;  cycle efficiency;  exergy efficiency;  thermal efficiency

PACS:

TK21

DOI:

10.3969/j.issn.1003-7985.2015.04.010

Abstract:

To improve the overall thermal efficiency of the organic Rankine cycle(ORC), a simulation study was carried out for a combined heat and power(CHP)system, using the Redlich-Kuang-Soave(RKS)equation of state. In the system, R245fa was selected as the working fluid. A scroll expander was modeled with empirical isentropic expansion efficiency. Plate heat exchangers were selected as the evaporator and the condenser, and detailed heat transfer models were programmed for both one-phase and two-phase regions. Simulations were carried out at seven different heat source temperatures(80, 90, 100, 110, 120, 130, 140 ℃)in combination with eight different heat sink temperatures(20, 25, 30, 35, 40, 45, 50, 55 ℃). Results show that in the ORC without an internal heat exchanger(IHE), the optimum cycle efficiencies are in the range of 7.0% to 7.3% when the temperature differences between the heat source and heat sink are in the range of 70 to 90 ℃. Simulations on CHP reveal that domestic hot water can be produced when the heat sink inlet temperature is higher than 40 ℃, and the corresponding exergy efficiency and overall thermal efficiency are 29% to 56% and 87% to 90% higher than those in the non-CHP ORC, respectively. It is found that the IHE has little effect on the improvement of work output and efficiencies for the CHP ORC.

References:

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Memo

Memo:

Biographies: Liu Yulan(1990—), female, graduate; Chen Jiufa(corresponding author), male, doctor, professor, chen.jiufa@126.com.
Foundation item: Special Fund for Industry, University and Research Cooperation(No.2011DFR61130).
Citation: Liu Yulan, Cao Zheng, Chen Jiufa, et al.Simulation and performance analysis of organic Rankine cycle combined heat and power system[J].Journal of Southeast University(English Edition), 2015, 31(4):489-495.[doi:10.3969/j.issn.1003-7985.2015.04.010]

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