Comparative assessment of heat pump cycle operated with R32/R1234ze(E) and R32/R1234yf mixtures

Hideki Kojima, Sho Fukuda, Chieko Kondou, Nobuo Takata, Shigeru Koyama

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

    2 Citations (Scopus)

    Abstract

    This study measures the COPs of R32/R1234ze(E) and R32/R1234yf with GWPs of approximately 285 and 190 with a vapour compression cycle under two heating modes, where the heat sink water change temperature 10 K and 25 K. At a temperature change of 10 K, the COPs of mixtures are significantly lower than that of R410A. At a temperature change of 25 K, the COPs of mixtures are generally comparable to that of R410A. When the temperature change in heat sink fluid is large, the larger temperature glide of the combination R32/R1234e(E) is somewhat advantageous to reduce the irreversible loss in condenser. The smaller volumetric capacity of refrigerant mixture significantly increases the volumetric flow rate and the irreversible loss in the compressor at higher heating loads. The pinch point of R410A appeared in the condenser caused excess pressure rising and increased compressor loss at a temperature change of 25 K.

    Original languageEnglish
    Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
    PublisherInternational Institute of Refrigeration
    Pages2449-2456
    Number of pages8
    ISBN (Electronic)9782362150128
    DOIs
    Publication statusPublished - Jan 1 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

    Other

    Other24th IIR International Congress of Refrigeration, ICR 2015
    CountryJapan
    CityYokohama
    Period8/16/158/22/15

    Fingerprint

    heat pumps
    Pumps
    cycles
    condensers
    heat sinks
    Heat sinks
    compressors
    Temperature
    temperature
    Compressors
    Heating
    heating
    refrigerants
    Refrigerants
    Hot Temperature
    flow velocity
    Vapors
    Flow rate
    vapors
    Fluids

    All Science Journal Classification (ASJC) codes

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

    Cite this

    Kojima, H., Fukuda, S., Kondou, C., Takata, N., & Koyama, S. (2015). Comparative assessment of heat pump cycle operated with R32/R1234ze(E) and R32/R1234yf mixtures. In 24th IIR International Congress of Refrigeration, ICR 2015 (pp. 2449-2456). (Refrigeration Science and Technology). International Institute of Refrigeration. https://doi.org/10.18462/iir.icr.2015.0221

    Comparative assessment of heat pump cycle operated with R32/R1234ze(E) and R32/R1234yf mixtures. / Kojima, Hideki; Fukuda, Sho; Kondou, Chieko; Takata, Nobuo; Koyama, Shigeru.

    24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, 2015. p. 2449-2456 (Refrigeration Science and Technology).

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

    Kojima, H, Fukuda, S, Kondou, C, Takata, N & Koyama, S 2015, Comparative assessment of heat pump cycle operated with R32/R1234ze(E) and R32/R1234yf mixtures. in 24th IIR International Congress of Refrigeration, ICR 2015. Refrigeration Science and Technology, International Institute of Refrigeration, pp. 2449-2456, 24th IIR International Congress of Refrigeration, ICR 2015, Yokohama, Japan, 8/16/15. https://doi.org/10.18462/iir.icr.2015.0221
    Kojima H, Fukuda S, Kondou C, Takata N, Koyama S. Comparative assessment of heat pump cycle operated with R32/R1234ze(E) and R32/R1234yf mixtures. In 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration. 2015. p. 2449-2456. (Refrigeration Science and Technology). https://doi.org/10.18462/iir.icr.2015.0221
    Kojima, Hideki ; Fukuda, Sho ; Kondou, Chieko ; Takata, Nobuo ; Koyama, Shigeru. / Comparative assessment of heat pump cycle operated with R32/R1234ze(E) and R32/R1234yf mixtures. 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, 2015. pp. 2449-2456 (Refrigeration Science and Technology).
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    abstract = "This study measures the COPs of R32/R1234ze(E) and R32/R1234yf with GWPs of approximately 285 and 190 with a vapour compression cycle under two heating modes, where the heat sink water change temperature 10 K and 25 K. At a temperature change of 10 K, the COPs of mixtures are significantly lower than that of R410A. At a temperature change of 25 K, the COPs of mixtures are generally comparable to that of R410A. When the temperature change in heat sink fluid is large, the larger temperature glide of the combination R32/R1234e(E) is somewhat advantageous to reduce the irreversible loss in condenser. The smaller volumetric capacity of refrigerant mixture significantly increases the volumetric flow rate and the irreversible loss in the compressor at higher heating loads. The pinch point of R410A appeared in the condenser caused excess pressure rising and increased compressor loss at a temperature change of 25 K.",
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    AB - This study measures the COPs of R32/R1234ze(E) and R32/R1234yf with GWPs of approximately 285 and 190 with a vapour compression cycle under two heating modes, where the heat sink water change temperature 10 K and 25 K. At a temperature change of 10 K, the COPs of mixtures are significantly lower than that of R410A. At a temperature change of 25 K, the COPs of mixtures are generally comparable to that of R410A. When the temperature change in heat sink fluid is large, the larger temperature glide of the combination R32/R1234e(E) is somewhat advantageous to reduce the irreversible loss in condenser. The smaller volumetric capacity of refrigerant mixture significantly increases the volumetric flow rate and the irreversible loss in the compressor at higher heating loads. The pinch point of R410A appeared in the condenser caused excess pressure rising and increased compressor loss at a temperature change of 25 K.

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