[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(
)
有机朗肯循环热电联产系统的模拟及性能分析
)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
- 有机朗肯循环热电联产系统的模拟及性能分析
- 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.
- 为提高有机朗肯循环(ORC)的热效率, 基于RKS状态方程编制模拟程序对热电联产系统进行模拟研究.其中, 循环工质选用R245fa, 涡旋膨胀机模型依据经验等熵膨胀效率建立, 蒸发器和冷凝器选用板式换热器, 并对单、两相区建立详细的传热模型.该程序模拟了7个热源温度(80, 90, 100, 110, 120, 130, 140 ℃)和8个冷源温度(20, 25, 30, 35, 40, 45, 50, 55 ℃)下的循环工况.结果表明:在无内热交换器ORC中, 当冷热源温差处于70~90 ℃, 最佳循环效率为7.0%~7.3%;当冷源入口温度高于40 ℃, CHP ORC输出生活热水, 且系统效率和热效率分别比非CHP系统增加了29%~56%和87%~90%;内热交换器对CHP ORC系统输出功及效率的改善很小.
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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]