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Parameter Sensitivity Study for Typical Expander-Based Transcritical CO 2 Refrigeration Cycles

Author

Listed:
  • Bo Zhang

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

  • Liu Chen

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

  • Lang Liu

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

  • Xiaoyan Zhang

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

  • Mei Wang

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

  • Changfa Ji

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

  • KI-IL Song

    (Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China)

Abstract

A sensitivity study was conducted for three typical expander-based transcritical CO 2 cycles with the developed simulation model, and the sensitivities of the maximum coefficient of performance (COP) to the key operating parameters, including the inlet pressure of gas cooler, the temperatures at evaporator inlet and gas cooler outlet, the inter-stage pressure and the isentropic efficiency of expander, were obtained. The results showed that the sensitivity to the gas cooler inlet pressure differs greatly before and after the optimal gas cooler inlet pressure. The sensitivity to the intercooler outlet temperature in the two-stage cycles increases sharply to near zero and then keeps almost constant at intercooler outlet temperature of higher than 45 °C. However, the sensitivity stabilizes near zero when the evaporator inlet temperature is very low of −26.1 °C. In two-stage compression with an intercooler and an expander assisting in driving the first-stage compressor (TEADFC) cycle, an abrupt change in the sensitivity of maximum COP to the inter-stage pressure was observed, but disappeared after intercooler outlet temperature exceeds 50 °C. The sensitivity of maximum COP to the expander isentropic efficiency increases almost linearly with the expander isentropic efficiency.

Suggested Citation

  • Bo Zhang & Liu Chen & Lang Liu & Xiaoyan Zhang & Mei Wang & Changfa Ji & KI-IL Song, 2018. "Parameter Sensitivity Study for Typical Expander-Based Transcritical CO 2 Refrigeration Cycles," Energies, MDPI, vol. 11(5), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1279-:d:146916
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    References listed on IDEAS

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    1. Yang, Jun Lan & Ma, Yi Tai & Liu, Sheng Chun, 2007. "Performance investigation of transcritical carbon dioxide two-stage compression cycle with expander," Energy, Elsevier, vol. 32(3), pages 237-245.
    2. Yang, Jun Lan & Ma, Yi Tai & Li, Min Xia & Guan, Hai Qing, 2005. "Exergy analysis of transcritical carbon dioxide refrigeration cycle with an expander," Energy, Elsevier, vol. 30(7), pages 1162-1175.
    3. Hu, Jing & Li, Minxia & Zhao, Li & Xia, Borui & Ma, Yitai, 2015. "Improvement and experimental research of CO2 two-rolling piston expander," Energy, Elsevier, vol. 93(P2), pages 2199-2207.
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    Cited by:

    1. Juanli Ma & Ahmad Mhanna & Neil Juan & Monica Brands & Alan S. Fung, 2019. "Effects of Intercooling and Inter-Stage Heat Recovery on the Performance of Two-Stage Transcritical CO 2 Cycles for Residential Heating Applications," Energies, MDPI, vol. 12(24), pages 1-15, December.
    2. Ignacio López Paniagua & Ángel Jiménez Álvaro & Javier Rodríguez Martín & Celina González Fernández & Rafael Nieto Carlier, 2019. "Comparison of Transcritical CO 2 and Conventional Refrigerant Heat Pump Water Heaters for Domestic Applications," Energies, MDPI, vol. 12(3), pages 1-17, February.
    3. Konrad, Mary Elizabeth & MacDonald, Brendan D., 2023. "Cold climate air source heat pumps: Industry progress and thermodynamic analysis of market-available residential units," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).

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