Simulation and performance analysis of organic Rankine cycle combined heat and power system

被引：1

作者：

School of Energy and Environment, Southeast University, Nanjing ^{[1
]}

210096, China

不详 ^{[2
]}

200233, China

机构：

[1] School of Energy and Environment, Southeast University, Nanjing

[2] Lotusland Renewable Energy Holdings Limited, Shanghai

来源：

J. Southeast Univ. Engl. Ed. | / 4卷 / 489-495期

关键词：

Combined heat and power; Cycle efficiency; Exergy efficiency; Organic Rankine cycle; Thermal efficiency;

D O I：

10.3969/j.issn.1003-7985.2015.04.010

中图分类号：

学科分类号：

摘要：

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. © 2015, Editorial Department of Journal of Southeast University. All right reserved.

引用

页码：489 / 495

页数：6

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