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The steady behavior of the supercritical carbon dioxide natural circulation loop

Author

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  • Draskic, Marko
  • Bugeat, Benjamin
  • Pecnik, Rene

Abstract

The steady state behavior of thermodynamically supercritical natural circulation loops (NCLs) is investigated in this work. Experimental steady state results with carbon dioxide are presented for supercritical pressures in the range of 80–120 bar, and temperatures in the range of 20–65 °C. Distinct thermodynamic states are reached by traversing a set of isochors. An equation for the prediction of the steady state of NCLs at supercritical pressures is presented, and its performance is assessed using empirical data. Changes of mass flow rate as a result of independent changes of thermodynamic state, heating rate, driving height and viscous losses are shown to be accurately captured by the proposed equation. Furthermore, close agreement between the predicted and measured mass flow rate is found when the measured equipment losses are taken into account for the comparison. Subsequently, the findings are put forward in aid of the development of safe, novel supercritical natural circulation facilities.

Suggested Citation

  • Draskic, Marko & Bugeat, Benjamin & Pecnik, Rene, 2024. "The steady behavior of the supercritical carbon dioxide natural circulation loop," Energy, Elsevier, vol. 294(C).
    • Handle: RePEc:eee:energy:v:294:y:2024:i:c:s0360544224005073
    DOI: 10.1016/j.energy.2024.130735
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    References listed on IDEAS

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    1. Liu, Guangxu & Huang, Yanping & Wang, Junfeng, 2019. "A new theoretical model of steady-state characteristics of supercritical carbon dioxide natural circulation," Energy, Elsevier, vol. 189(C).
    2. Wahl, Andreas & Mertz, Rainer & Laurien, Eckart & Starflinger, Jörg, 2022. "Heat transfer deterioration in vertical sCO2 cooling in 3 mm tube," Energy, Elsevier, vol. 254(PB).
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