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Performance comparison of an indoor unit of a heat pump with low-GWP alternative refrigerants focusing on R455A and R454C.

Number: 1129

Author(s) : VASU A., CHANG Y. S.

Summary

The phase-out of high-impact refrigerants drives the adoption of low-GWP alternatives, with zeotropic mixtures emerging as promising candidates. However, their adoption introduces new challenges in adapting existing heat pump systems to maintain performance. This study evaluates the thermal performance of nearazeotropic R410A, and low-GWP zeotropic blends R454C, and R455A in a 4-kW indoor heat pump unit using a validated finned-tube heat exchanger simulation for cooling and heating modes. The results show that R455A and R454C exhibit significantly lower HTCs compared to R410A—61.4% and 49.5% in cooling mode, and 84.6% and 64.2% in heating mode, respectively—due to thermophysical property differences, reduced mass flux, and large glide temperature differences (GTD), which cause a cross-parallel flow effect. To mitigate performance losses, circuitry optimization is highlighted as essential. This study emphasizes the need for careful system adaptation to ensure effective integration of low-GWP refrigerants in heat pump applications. 

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Pages: 9 p.

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Details

  • Original title: Performance comparison of an indoor unit of a heat pump with low-GWP alternative refrigerants focusing on R455A and R454C.
  • Record ID : 30034178
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 1st IIR International Conference on Refrigeration Adapting to Rising Temperatures
  • Publication date: 2025/08
  • DOI: http://dx.doi.org/10.18462/iir.adaptation.2024.1129

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