Surface tension of low GWP refrigerants R1234ze(Z) and R1233zd(E)

Chieko Kondou, Ryuichi Nagata, Noriko Nii, Shigeru Koyama, Yukihiro Higashi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    R1234ze(Z) and R1233zd(E) are very recently under consideration as a potential candidate to replace R245fa that is widely used in organic Rankine cycles and high-temperature industrial heat pumps. The capillary constant and surface tension of saturated R1234ze(Z) and R1233zd(E) were measured across the temperature range from 274 K to 350 K using a measuring apparatus based on the differential capillary rise method. The measurement uncertainty in the surface tension was typically 0.3 mN m-1. The experimental surface tension was well represented by a van der Waals type equation expressing the temperature dependence as, ω= 59.90 (1 - Tr)1.237 for R245fa, ω= 56.57 (1 - Tr) 1.220 for R1234ze(Z), and ω= 61.95 (1 - Tr) 1.277 for R1233zd(E), where, ω and Tr are the surface tension in mNm-1 and the reduced temperature, Tr = T/Tcrit. The critical temperatures Tcrit are given as 427.01 K for R245fa, 423.27 K for R1234ze(Z) by Higashi et al. (2015), and 438.75 K for R1233zd(E) by Hulse et al. (2012). The constants and exponents are empirically determined by the least square mean method. The above correlations represent the experimental surface tension within ±0.13, ±0.21 mN m1, and ±0.05 mN m-1 for R245fa, R1234ze(Z), and R1233zd(E), respectively.

    Original languageEnglish
    Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
    PublisherInternational Institute of Refrigeration
    Number of pages8
    ISBN (Electronic)9782362150128
    Publication statusPublished - 2015
    Event24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
    Duration: Aug 16 2015Aug 22 2015

    Publication series

    NameRefrigeration Science and Technology
    ISSN (Print)0151-1637


    Other24th IIR International Congress of Refrigeration, ICR 2015

    All Science Journal Classification (ASJC) codes

    • Control and Systems Engineering
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Condensed Matter Physics


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