Research Papers: Gas Turbines: Coal, Biomass, and Alternative Fuels

Performance Analysis of Organic Rankine Cycle With Preliminary Design of Radial Turbo Expander for Binary-Cycle Geothermal Plants

[+] Author and Article Information
Xing Wang

e-mail: wangxing93@163.com

Xiaomin Liu

e-mail: liuxm@mail.xjtu.edu.cn

Chuhua Zhang

e-mail: chzhang@mail.xjtu.edu.cn
School of Energy and Power Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi710049, China

1Corresponding author.

Contributed by the Coal, Biomass and Alternate Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 9, 2013; final manuscript received July 11, 2013; published online September 17, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(11), 111402 (Sep 17, 2013) (8 pages) Paper No: GTP-13-1247; doi: 10.1115/1.4025040 History: Received July 09, 2013; Revised July 11, 2013

In order to produce less emission of greenhouse gases, many studies have been done on the binary-cycle geothermal power plant to obtain better performance. The radial turbo expanders play an important role in the performance of the organic rankine cycle (ORC) for binary-cycle geothermal plants. However, few studies have investigated the effect of parameters of radial turbo expanders on the performance of the ORC. In this paper, a new thermodynamic model of the ORC coupled with the preliminary design of radial turbo expanders is developed. The effects of geothermal water temperature on the ORC performance parameters, such as power output and thermal efficiency are investigated by using the proposed thermodynamic model. The variation of radial turbo expanders’ parameters, such as specific rotational speed with geothermal water temperature is revealed. In the present study, the reasonable efficiency of radial turbo expanders by using the preliminary design is adopted to analyze the performance of the ORC, and an accurate reference about the effect of geothermal source on the parameters of radial turbo expanders is obtained.

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Fig. 1

Schematic diagram of the ORC system

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Fig. 2

Temperature-entropy diagram of the ORC system

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Fig. 3

Work flow diagram for the preliminary design of radial turbo expander

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Fig. 4

Variations of power output of ORC with temperature of geothermal water for R134a and R245fa

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Fig. 5

Variations of relative loss coefficients with temperature of geothermal water for R134a and R245fa

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Fig. 6

Variations of isentropic efficiency of radial turbo expander with temperature of geothermal water for R134a and R245fa

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Fig. 7

Variations of power output and thermal efficiency of ORC with temperature of geothermal water for R134a and R245fa

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Fig. 8

Variations of ρ, μ, and x with temperature of geothermal water for R134a and R245fa

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Fig. 9

Variations of specific speed with temperature of geothermal water for R134a and R245fa

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Fig. 10

Schematic of radial inflow turbine



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