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Regasification of liquid nitrogen in zigzag PCHE under cryogenic conditions: experimental results and correlation assessment.

Author(s) : TIAN Z., JIANG T., PENG H., SONG Z., ZHAO B., SHEN W.

Type of article: IJR article

Summary

In recent years, the LNG vessel market has experienced significant expansion, demonstrating considerable potential. Printed circuit heat exchangers (PCHEs), characterized by exceptional heat transfer efficiency, compact size, and operational capability in cryogenic environments, are highly suitable for application in LNG vessel fuel gas supply systems (FGSS). This study investigates the thermal performance of liquid nitrogen (LN) and a 50 % ethylene glycol aqueous solution (EG) in a zigzag PCHE. Experiments were conducted at 1 MPa, varying the EG inlet temperature (40, 45, 50 ◦C), EG mass flow rate (1023–1780 kg h⁻¹), and LN mass flow rate (90–150 kg h⁻¹). Based on experimental results, the thermal resistance separation method was employed to calculate the Nusselt number (Nu), convective heat transfer coefficient (h), and pressure drop. The findings indicate that increasing the mass flow rates of LN and EG, as well as the EG inlet temperature, enhances the heat transfer capacity of the zigzag PCHE. The pressure drop rises with increasing EG mass flow rate. Additionally, freezing phenomena were examined using temperature measurement plates inside the PCHE. Freezing was observed near the inlet section, leading to reduced heat transfer and increased pressure drop. Increasing the EG mass flow rate and inlet temperature effectively mitigates freezing risks. Finally, new heat transfer and pressure drop correlations for cryogenic PCHEs were proposed, with deviations of the predicted Nu and f within 15 % and 23 %, respectively. This study provides valuable insights for the design and optimization of PCHEs as cryogenic evaporators, establishing a solid foundation for their application in FGSS.

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Pages: 13 p.

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Details

  • Original title: Regasification of liquid nitrogen in zigzag PCHE under cryogenic conditions: experimental results and correlation assessment.
  • Record ID : 30034373
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Publication date: 2025/11
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.08.002

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