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Surface tension measurement of refrigerant mixtures R448A and R455A by a differential capillary rise method.

Number: 2016

Author(s) : LIU Y., KONDOU C.

Summary

R448A and R455A are refrigerant mixtures containing hydrofluoroolefins. They exhibit low global warming potential and are anticipated to replace R404A. R448A is a quinary mixture of R32, R125, R134a, R1234ze(E), and R1234yf (26/26/21/7/20% by mass), whereas R455A is a ternary mixture of R32, R1234yf, and R744 (21.5/75.5/3% by mass). In this study, the surface tensions of R448A and R455A were measured using a differential capillary rise method with a total propagated uncertainty of approximately ± 0.1 mNm−1. The temperatures for the measurements for R448 and R455A were 266.3–320.0 and 267.7–332.8 K, respectively. Empirical correlations were derived, and the calculated values were observed to be in agreement with the measured data within margins ±0.16 mNm−1 for R448A and ±0.11 mNm−1 for R455A. The “parachor” of each component was determined, and the surface tensions of R448A and R455A were calculated using the proposed mixing parameters and were compared with the measured data.

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Pages: 8

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Details

  • Original title: Surface tension measurement of refrigerant mixtures R448A and R455A by a differential capillary rise method.
  • Record ID : 30028920
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 6th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2021/09/01
  • DOI: http://dx.doi.org/10.18462/iir.TPTPR.2021.2016
  • Document available for consultation in the library of the IIR headquarters only.

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