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Design of the ORC (organic Rankine cycle) condensation temperature with respect to the expander characteristics for domestic CHP (combined heat and power) applications

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  • Li, Jing
  • Pei, Gang
  • Ji, Jie
  • Bai, Xiaoman
  • Li, Pengcheng
  • Xia, Lijun

Abstract

Domestic CHP (combined heat and power) generation is one new application of the ORC (organic Rankine cycle). An environment temperature fluctuation of 40 °C through the year is common in many areas, where the consumer's demand on heat follows a seasonal cycle. In no demand periods the ORC shall work under lower condensation temperature for more efficient power generation. Off-design operation will be executed, accompanied with a degraded performance of the ORC components especially the expander. The design of the condensation temperature herein becomes crucial. It influences the ORC efficiency in both the CHP and SPG (solo power generation) modes. If the condensation temperature is designed simply based on the CHP mode, the power conversion in the SPG mode will suffer from low expander efficiency. An optimum design of the condensation temperature involves a compromise between the power outputs in the two modes. This paper aims to determine the optimum design condensation temperature for the ORC-CHP system. A new concept, namely the threshold condensation temperature, is introduced and found to be important to the design and operation strategies of the system. The results indicate that via a careful design of the condensation temperature, the annual power output can be increased by 50%.

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  • Li, Jing & Pei, Gang & Ji, Jie & Bai, Xiaoman & Li, Pengcheng & Xia, Lijun, 2014. "Design of the ORC (organic Rankine cycle) condensation temperature with respect to the expander characteristics for domestic CHP (combined heat and power) applications," Energy, Elsevier, vol. 77(C), pages 579-590.
    • Handle: RePEc:eee:energy:v:77:y:2014:i:c:p:579-590
    DOI: 10.1016/j.energy.2014.09.039
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    References listed on IDEAS

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    2. Zhu, Yilin & Li, Weiyi & Sun, Guanzhong & Li, Haojie, 2018. "Thermo-economic analysis based on objective functions of an organic Rankine cycle for waste heat recovery from marine diesel engine," Energy, Elsevier, vol. 158(C), pages 343-356.
    3. Al-Sayyab, Ali Khalid Shaker & Mota-Babiloni, Adrián & Navarro-Esbrí, Joaquín, 2023. "Performance evaluation of modified compound organic Rankine-vapour compression cycle with two cooling levels, heating, and power generation," Applied Energy, Elsevier, vol. 334(C).
    4. 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.
    5. Yari, Mortaza & Ariyanfar, Leyli & Aghdam, Ebrahim Abdi, 2018. "Analysis and performance assessment of a novel ORC based multi-generation system for power, distilled water and heat," Renewable Energy, Elsevier, vol. 119(C), pages 262-281.
    6. Li, Jing & Li, Pengcheng & Pei, Gang & Alvi, Jahan Zeb & Ji, Jie, 2016. "Analysis of a novel solar electricity generation system using cascade Rankine cycle and steam screw expander," Applied Energy, Elsevier, vol. 165(C), pages 627-638.
    7. Li, Ligeng & Tian, Hua & Liu, Peng & Shi, Lingfeng & Shu, Gequn, 2021. "Optimization of CO2 Transcritical Power Cycle (CTPC) for engine waste heat recovery based on split concept," Energy, Elsevier, vol. 229(C).

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