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Modelling of heat transfer in supercritical pressure recuperators

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  • Mikielewicz, Dariusz
  • Mikielewicz, Jarosław

Abstract

In the paper presented is analysis of convective flow heat transfer at supercritical pressure in channels of heat exchanger working in the thermodynamic cycle. The modelling is based on the division of the flow into three regions, namely the heavy fluid, a two phase flow consisting of the heavy and light fluids and finally the light fluid flow. Modelling is concentrated on the region of simultaneous flow of two fluids divided into the zones with the light and heavy fluids. These agents are considered with averaged thermophysical properties in each region. The surface separating the two zones with respective fluids is assumed to feature the pseudocritical temperature. The problem is solved using a previously developed theoretical model based on considerations of energy dissipation in the flow. The fundamental hypothesis in the model is the fact that heat transfer is considered as being dependent on two contributions of energy dissipation, one stemming from the shearing pseudo two-phase flow of the heavy and light fluids, whereas the second contribution comes from the energy dissipation due to exchange of mass between the heavy and light fluids. The results of calculations have been compared with some experimental data from literature showing a good consistency.

Suggested Citation

  • Mikielewicz, Dariusz & Mikielewicz, Jarosław, 2020. "Modelling of heat transfer in supercritical pressure recuperators," Energy, Elsevier, vol. 207(C).
    • Handle: RePEc:eee:energy:v:207:y:2020:i:c:s036054422031358x
    DOI: 10.1016/j.energy.2020.118251
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    References listed on IDEAS

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    1. Can Cai & Xiaochuan Wang & Shaohua Mao & Yong Kang & Yiyuan Lu & Xiangdong Han & Wenchuan Liu, 2017. "Heat Transfer Characteristics and Prediction Model of Supercritical Carbon Dioxide (SC-CO 2 ) in a Vertical Tube," Energies, MDPI, vol. 10(11), pages 1-21, November.
    2. Sarkar, Jahar, 2015. "Review and future trends of supercritical CO2 Rankine cycle for low-grade heat conversion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 48(C), pages 434-451.
    3. Huang, Dan & Wu, Zan & Sunden, Bengt & Li, Wei, 2016. "A brief review on convection heat transfer of fluids at supercritical pressures in tubes and the recent progress," Applied Energy, Elsevier, vol. 162(C), pages 494-505.
    4. Yang, Yongping & Wang, Ligang & Dong, Changqing & Xu, Gang & Morosuk, Tatiana & Tsatsaronis, George, 2013. "Comprehensive exergy-based evaluation and parametric study of a coal-fired ultra-supercritical power plant," Applied Energy, Elsevier, vol. 112(C), pages 1087-1099.
    5. Sarkar, Jahar, 2009. "Second law analysis of supercritical CO2 recompression Brayton cycle," Energy, Elsevier, vol. 34(9), pages 1172-1178.
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    Cited by:

    1. Mikielewicz, Dariusz & Mikielewicz, Jarosław, 2022. "Analysis of Organic Rankine Cycle efficiency and vapor generator heat transfer surface in function of the reduced pressure," Energy, Elsevier, vol. 261(PB).

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