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Structural analysis and optimization of flattened tube gas cooler for transcritical CO2 heat pump systems

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  • Khoshvaght-Aliabadi, M.
  • Ghodrati, P.
  • Rashidi, M.M.
  • Kang, Y.T.

Abstract

The performance of gas cooler is acknowledged as a vital factor in CO2 heat pump systems. Consequently, its optimal design can significantly impact the overall efficiency, attributed to the pronounced changes in thermophysical properties of CO2 during pseudo-critical operating conditions. This research examines, for the first time, various configurations of flattened tubes (FTs) utilized as the conduit for CO2 flow within the gas cooler. It is established that changing the cross-sectional configuration represents an effective approach for enhancing the thermal performance of the gas cooler, resulting in a significant increase of up to 60 % in heat transfer coefficient. All FTs exhibit superior overall performance across most CO2 cooling conditions compared to circular tubes. Regarding the performance index, the overall improvement can be reached up to 31.8 % and 18.6 % under near-critical and trans-critical conditions, respectively. Furthermore, an optimization is conducted using BBD-RSM for a specific alternating FT due to its potential to enhance the thermal performance not only on the CO2 side but also on the cold side of the gas cooler. The analysis highlights the significant positive influence of the minimum axis on the thermal and hydraulic specifications of gas cooler, followed by the transition length.

Suggested Citation

  • Khoshvaght-Aliabadi, M. & Ghodrati, P. & Rashidi, M.M. & Kang, Y.T., 2024. "Structural analysis and optimization of flattened tube gas cooler for transcritical CO2 heat pump systems," Energy, Elsevier, vol. 307(C).
    • Handle: RePEc:eee:energy:v:307:y:2024:i:c:s0360544224023624
    DOI: 10.1016/j.energy.2024.132588
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    References listed on IDEAS

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    1. Yang, Lingxiao & Wang, Xin & Xu, Bo & Chen, Zhenqian, 2025. "Experimental study on combined cooling and heating supply of a transcritical CO2 heat pump based on high-temperature heating optimization," Energy, Elsevier, vol. 337(C).
    2. Pérez-Álvarez, Rafael & Rodríguez-Sánchez, María de los Reyes & Santana, Domingo & Acosta-Iborra, Antonio, 2025. "Hydraulic-thermal-mechanical optimization of a bayonet tube for solar power tower receivers," Energy, Elsevier, vol. 338(C).
    3. Zhao, Wenke & Zhang, Yaning & Sun, Chenyang & Li, Lei & Li, Bingxi & Xu, Jie, 2025. "Thermodynamic analysis of a transcritical CO2 heat pump for heating applications," Energy, Elsevier, vol. 318(C).
    4. Dai, Hongsong & Yang, Chenxu & Zhang, Feng & Liao, Gaoliang & Zhang, Bolun & E, Jiaqiang, 2025. "Transient heat dissipation performance investigation on the battery thermal management system based on S-CO2 immersion cooling," Energy, Elsevier, vol. 318(C).

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