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Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles

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  • Yu-Ting Wu

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

  • Biao Lei

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

  • Chong-Fang Ma

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

  • Lei Zhao

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

  • Jing-Fu Wang

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

  • Hang Guo

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

  • Yuan-Wei Lu

    (Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

Abstract

The circulation pump in an organic Rankine cycle (ORC) increases the pressure of the liquid working fluid from low condensing pressure to high evaporating pressure, and the expander utilizes the pressure difference to generate work. A portion of the expander output power is used to offset the consumed pumping work, and the rest of the expander power is exactly the net work produced by the ORC system. Because of the relatively great theoretical pumping work and very low efficiency of the circulation pump reported in previous papers, the characteristics of the expander power used for offsetting the pumping work need serious consideration. In particular, the present work examines those characteristics. It is found that the characteristics of the expander power used for offsetting the pumping work are satisfactory only under the condition that the working fluid absorbs sufficient heat in the evaporator and its specific volume at the evaporator outlet is larger than or equal to a threshold value.

Suggested Citation

  • Yu-Ting Wu & Biao Lei & Chong-Fang Ma & Lei Zhao & Jing-Fu Wang & Hang Guo & Yuan-Wei Lu, 2014. "Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles," Energies, MDPI, vol. 7(8), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:8:p:4957-4971:d:38726
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    References listed on IDEAS

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    Cited by:

    1. Gaosheng Li & Hongguang Zhang & Fubin Yang & Songsong Song & Ying Chang & Fei Yu & Jingfu Wang & Baofeng Yao, 2016. "Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System," Energies, MDPI, vol. 9(4), pages 1-18, April.
    2. Yuting Wu & Ruiping Zhi & Biao Lei & Wei Wang & Jingfu Wang & Guoqiang Li & Huan Wang & Chongfang Ma, 2016. "Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions," Energies, MDPI, vol. 9(7), pages 1-17, June.

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