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Water (R-718) as a refrigerant for high-temperature heat pumps: opportunities, challenges, and future directions.

Auteurs : ELWARDANY M., REDDY Y. S. K., NASSIF N.

Type d'article : Article de périodique, Synthèse

Résumé

High-temperature heat pumps (HTHPs) using water (R-718) as a refrigerant are gaining attention as a sustainable and energy-efficient solution for industrial heating processes. This review analysis recent progress in the development of R-718-based HTHPs, focusing on theoretical modeling, simulation studies, and experimental advancements. Simulation results indicate that these systems especially those employing twin-screw or centrifugal compressors can achieve coefficients of performance (COPs) between 1.3 and 6.10 for output temperatures ranging from 130 °C to 250 °C, corresponding to temperature lifts of approximately 20 K to 100 K. Cascade configurations combining R-718 with low-GWP refrigerants such as R600 or R1234ze(Z) have demonstrated effective temperature lifts of up to 180 K with COPs between 1.5 and 4.5. Experimental studies support these findings, showing that R-718-based systems outperform traditional refrigerants such as hydrocarbons, hydrofluoroolefins (HFOs), and hydrofluorocarbons (HFCs) under high-temperature conditions (above 100 °C). Overall, R-718-based HTHPs offer a clean, efficient, and reliable option for industrial heating, making them a promising technology for reducing carbon emissions in high-temperature processes.

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Pages : 34 p.

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Détails

  • Titre original : Water (R-718) as a refrigerant for high-temperature heat pumps: opportunities, challenges, and future directions.
  • Identifiant de la fiche : 30035345
  • Langues : Anglais
  • Sujet : Technologie
  • Source : Applied Thermal Engineering - vol.304 - Part 2
  • Date d'édition : 09/2026
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2026.132756

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