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Retrofit of lower-GWP alternative R448A into an R404A/R23 ULT freezer.

Number: 1120

Author(s) : GIMÉNEZ-PRADES P., NAVARRO-ESBRÍ J., UDROIU C-M., BARRANGAN-CERVERA A., FORÉS-PALANQUES A., MOTA-BABILONI A.

Summary

This work proposes an experimental assessment of R448A as a lower-GWP alternative to R404A in the hightemperature stage of a R404A/R23 ULT two-stage cascade refrigeration system. Furthermore, the use of capillary tubes and electronic expansion valves is compared. First, the pull-down performance starting from three ambient temperatures (15, 20, and 25 °C) down to –80 °C is analysed. Then, the hysteresis operation with set freezer temperatures of –80, –70, –60, and –50 °C is studied. The pull-down time was higher (38 to 55 min slower) using the capillary tubes compared to the electronic expansion valves. Also, the energy consumption of the hysteresis operation was higher (up to 32.3% higher) using the capillary tubes. A comparable energy consumption and cooling capacity were obtained with R404A/R23 and R448A/R23 using the electronic expansion valves. The highest COP was achieved by R448A/R23 (up to 10.2% higher than R404A/R23). Therefore, the suitability of R448A as a replacement for R404A in ULT refrigeration is confirmed.

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Details

  • Original title: Retrofit of lower-GWP alternative R448A into an R404A/R23 ULT freezer.
  • Record ID : 30034174
  • 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.2024.1120

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