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Optimization and exergy analysis of eco-friendly refrigerants in high-efficiency hydrate-based refrigeration systems.

Author(s) : ZHANG W., ZHOU S., GUO K., ZANG Y., JIANG X., QU Z., GAO H., CHEN J.

Type of article: IJR article

Summary

Hydrate-based refrigeration systems (HBRS), valued for their high energy efficiency and environmental friendliness, face optimization challenges requiring insights into multi-parameter interactions and energy flow control. This study systematically quantified the effects of hydrate mass fraction in slurry (0.40–0.90) and mechanical efficiency of pressurized transport equipment (40 % –90 % ) on system performance, overcoming the singleparameter focus of prior research by introducing tetrahydrofuran (THF) and developing four underground water-cooled HBRS configurations (A–D). Aspen Plus simulations and multi-dimensional exergy analysis revealed that at a hydrate mass fraction of 0.60 and 80 % fluid transport efficiency, the coefficient of performance (COP) ranges from 7.96 to 9.01 with HBRS-D achieving a 13.2 % COP improvement via cascade cold energy utilization. Sensitivity analysis identified compressor mechanical efficiency as the primary performance factor, followed by hydrate content and refrigerant pump efficiency. Exergy losses concentrated in hydrate formation/dissociation heat transfer (49 % ), compressor compression (24 %), and refrigerant pump transport (23 %). The system exhibited natural exergy efficiency of 23.32 % –25.40 % and actual exergy efficiency of 20.32 % –22.38 % . These findings established a parameter-system-efficiency optimization model based on exergy loss distribution. The design of key parameters in this study (with a hydrate mass fraction of 60 % and equipment efficiency of 80 %) features significant operability and engineering applicability, providing a solution with both innovativeness and implementation paths for breaking through the bottleneck of traditional refrigeration energy consumption.

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Details

  • Original title: Optimization and exergy analysis of eco-friendly refrigerants in high-efficiency hydrate-based refrigeration systems.
  • Record ID : 30034367
  • 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.2025.08.012

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