Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil

Masafumi Katsuta, Shinya Kishi, Naoyuki Miyachi, Takahiro Oshiro, Ryouichi Takai

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

    Abstract

    This paper describes evaporating heat transfer characteristics of a refrigeration cycle. Using R744 as working refrigerant, the effect of the oil mixing rate on the thermal and hydraulic characteristics were investigated. The main test section was a stainless tube an ID of 3.0 mm and the length of 500 mm, which was directly heated by electricity from an electric pole. Further, in order to visualize the flow pattern of the mixture of refrigerant and oil, we placed behind the evaporator sight glass made of acrylic block of 3.0 mm in ID and 135mm in length. Throughout experiments, it was recognized that oil was a significant factor of the heat transfer deterioration and of the increase of pressure drop. In addition, it was observed that the transition of the flow pattern was accelerated as oil concentration increases. Finally, it was concluded that the transition of the flow pattern was influenced by the mass flux and the oil concentration.

    Original languageEnglish
    Title of host publication4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
    PublisherNational Taipei University of Technology
    Pages305-310
    Number of pages6
    ISBN (Print)9868509610, 9789868509610
    Publication statusPublished - 2009
    Event4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei
    Duration: 2009 May 202009 May 22

    Other

    Other4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
    CityTaipei
    Period09/5/2009/5/22

    Fingerprint

    Refrigerants
    Flow patterns
    Oils
    Heat transfer
    Evaporators
    Refrigeration
    Acrylics
    Pressure drop
    Deterioration
    Poles
    Mass transfer
    Electricity
    Hydraulics
    Glass
    Experiments

    Keywords

    • Dryout
    • Flow pattern
    • Heat transfer
    • Lubricant
    • Pressure drop

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)

    Cite this

    Katsuta, M., Kishi, S., Miyachi, N., Oshiro, T., & Takai, R. (2009). Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil. In 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 (pp. 305-310). National Taipei University of Technology.

    Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil. / Katsuta, Masafumi; Kishi, Shinya; Miyachi, Naoyuki; Oshiro, Takahiro; Takai, Ryouichi.

    4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009. National Taipei University of Technology, 2009. p. 305-310.

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

    Katsuta, M, Kishi, S, Miyachi, N, Oshiro, T & Takai, R 2009, Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil. in 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009. National Taipei University of Technology, pp. 305-310, 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009, Taipei, 09/5/20.
    Katsuta M, Kishi S, Miyachi N, Oshiro T, Takai R. Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil. In 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009. National Taipei University of Technology. 2009. p. 305-310
    Katsuta, Masafumi ; Kishi, Shinya ; Miyachi, Naoyuki ; Oshiro, Takahiro ; Takai, Ryouichi. / Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil. 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009. National Taipei University of Technology, 2009. pp. 305-310
    @inproceedings{953265052008478d9540467017d1c96b,
    title = "Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil",
    abstract = "This paper describes evaporating heat transfer characteristics of a refrigeration cycle. Using R744 as working refrigerant, the effect of the oil mixing rate on the thermal and hydraulic characteristics were investigated. The main test section was a stainless tube an ID of 3.0 mm and the length of 500 mm, which was directly heated by electricity from an electric pole. Further, in order to visualize the flow pattern of the mixture of refrigerant and oil, we placed behind the evaporator sight glass made of acrylic block of 3.0 mm in ID and 135mm in length. Throughout experiments, it was recognized that oil was a significant factor of the heat transfer deterioration and of the increase of pressure drop. In addition, it was observed that the transition of the flow pattern was accelerated as oil concentration increases. Finally, it was concluded that the transition of the flow pattern was influenced by the mass flux and the oil concentration.",
    keywords = "Dryout, Flow pattern, Heat transfer, Lubricant, Pressure drop",
    author = "Masafumi Katsuta and Shinya Kishi and Naoyuki Miyachi and Takahiro Oshiro and Ryouichi Takai",
    year = "2009",
    language = "English",
    isbn = "9868509610",
    pages = "305--310",
    booktitle = "4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009",
    publisher = "National Taipei University of Technology",

    }

    TY - GEN

    T1 - Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil

    AU - Katsuta, Masafumi

    AU - Kishi, Shinya

    AU - Miyachi, Naoyuki

    AU - Oshiro, Takahiro

    AU - Takai, Ryouichi

    PY - 2009

    Y1 - 2009

    N2 - This paper describes evaporating heat transfer characteristics of a refrigeration cycle. Using R744 as working refrigerant, the effect of the oil mixing rate on the thermal and hydraulic characteristics were investigated. The main test section was a stainless tube an ID of 3.0 mm and the length of 500 mm, which was directly heated by electricity from an electric pole. Further, in order to visualize the flow pattern of the mixture of refrigerant and oil, we placed behind the evaporator sight glass made of acrylic block of 3.0 mm in ID and 135mm in length. Throughout experiments, it was recognized that oil was a significant factor of the heat transfer deterioration and of the increase of pressure drop. In addition, it was observed that the transition of the flow pattern was accelerated as oil concentration increases. Finally, it was concluded that the transition of the flow pattern was influenced by the mass flux and the oil concentration.

    AB - This paper describes evaporating heat transfer characteristics of a refrigeration cycle. Using R744 as working refrigerant, the effect of the oil mixing rate on the thermal and hydraulic characteristics were investigated. The main test section was a stainless tube an ID of 3.0 mm and the length of 500 mm, which was directly heated by electricity from an electric pole. Further, in order to visualize the flow pattern of the mixture of refrigerant and oil, we placed behind the evaporator sight glass made of acrylic block of 3.0 mm in ID and 135mm in length. Throughout experiments, it was recognized that oil was a significant factor of the heat transfer deterioration and of the increase of pressure drop. In addition, it was observed that the transition of the flow pattern was accelerated as oil concentration increases. Finally, it was concluded that the transition of the flow pattern was influenced by the mass flux and the oil concentration.

    KW - Dryout

    KW - Flow pattern

    KW - Heat transfer

    KW - Lubricant

    KW - Pressure drop

    UR - http://www.scopus.com/inward/record.url?scp=84907417189&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84907417189&partnerID=8YFLogxK

    M3 - Conference contribution

    AN - SCOPUS:84907417189

    SN - 9868509610

    SN - 9789868509610

    SP - 305

    EP - 310

    BT - 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009

    PB - National Taipei University of Technology

    ER -