Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis

Kuniyasu Matsumoto, Keisuke Ohno, Seiichi Yamaguchi, Kiyoshi Saito

    Research output: Contribution to conferencePaper

    Abstract

    Recently in Japan, it has been popular to install VRF (Variable Refrigerant Flow) heat pump system to office buildings regardless of size and shape, because many Japanese regard it as the virtue to turn off the air conditioner frequently for energy saving if it is not necessary. This system consists of packaged outdoor unit and multi indoor units connected by refrigerant pipe, and there are some merits for users and owners. For example, it is easy to design for planning building system because of standardized system. Moreover, this system contributes to saving energy and to increasing comfort for users, because it can be operated adequate indoor unit as necessary. On the other hand, because refrigerant flow rate changes dynamically depend on load condition, this system needs complicated control system for keeping stable operation under many manipulating elements. For that reason, it is too difficult to find adequate each elements' condition by only experimental study. In order to evaluate VRF system by easy way, we build the numerical simulation model based on law of physics and we research adequate control condition under various sorts of cooling condition. It is said that conventional control method occurs uns table manipulating condition in case of changing load condition. In this report, we reproduce unstable condition of expansion valve by simulation study.

    Original languageEnglish
    Publication statusPublished - 2018 Jan 1
    Event9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018 - Sapporo, Hokkaido, Japan
    Duration: 2018 Jun 102018 Jun 13

    Other

    Other9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018
    CountryJapan
    CitySapporo, Hokkaido
    Period18/6/1018/6/13

    Fingerprint

    refrigerants
    Flow of fluids
    evaluation
    Energy conservation
    Heat pump systems
    simulation
    Office buildings
    Refrigerants
    Physics
    Pipe
    Flow rate
    Cooling
    Control systems
    Planning
    Computer simulation
    heat pumps
    Air
    comfort
    planning
    Japan

    Keywords

    • Expansion valve
    • Heat pump
    • Hunting
    • Simulation
    • VRF

    ASJC Scopus subject areas

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

    Cite this

    Matsumoto, K., Ohno, K., Yamaguchi, S., & Saito, K. (2018). Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis. Paper presented at 9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018, Sapporo, Hokkaido, Japan.

    Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis. / Matsumoto, Kuniyasu; Ohno, Keisuke; Yamaguchi, Seiichi; Saito, Kiyoshi.

    2018. Paper presented at 9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018, Sapporo, Hokkaido, Japan.

    Research output: Contribution to conferencePaper

    Matsumoto, K, Ohno, K, Yamaguchi, S & Saito, K 2018, 'Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis' Paper presented at 9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018, Sapporo, Hokkaido, Japan, 18/6/10 - 18/6/13, .
    Matsumoto K, Ohno K, Yamaguchi S, Saito K. Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis. 2018. Paper presented at 9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018, Sapporo, Hokkaido, Japan.
    Matsumoto, Kuniyasu ; Ohno, Keisuke ; Yamaguchi, Seiichi ; Saito, Kiyoshi. / Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis. Paper presented at 9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018, Sapporo, Hokkaido, Japan.
    @conference{70ed8b76a60c4b80bd3485107baec619,
    title = "Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis",
    abstract = "Recently in Japan, it has been popular to install VRF (Variable Refrigerant Flow) heat pump system to office buildings regardless of size and shape, because many Japanese regard it as the virtue to turn off the air conditioner frequently for energy saving if it is not necessary. This system consists of packaged outdoor unit and multi indoor units connected by refrigerant pipe, and there are some merits for users and owners. For example, it is easy to design for planning building system because of standardized system. Moreover, this system contributes to saving energy and to increasing comfort for users, because it can be operated adequate indoor unit as necessary. On the other hand, because refrigerant flow rate changes dynamically depend on load condition, this system needs complicated control system for keeping stable operation under many manipulating elements. For that reason, it is too difficult to find adequate each elements' condition by only experimental study. In order to evaluate VRF system by easy way, we build the numerical simulation model based on law of physics and we research adequate control condition under various sorts of cooling condition. It is said that conventional control method occurs uns table manipulating condition in case of changing load condition. In this report, we reproduce unstable condition of expansion valve by simulation study.",
    keywords = "Expansion valve, Heat pump, Hunting, Simulation, VRF",
    author = "Kuniyasu Matsumoto and Keisuke Ohno and Seiichi Yamaguchi and Kiyoshi Saito",
    year = "2018",
    month = "1",
    day = "1",
    language = "English",
    note = "9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018 ; Conference date: 10-06-2018 Through 13-06-2018",

    }

    TY - CONF

    T1 - Evaluation of control method of VRF (variable refrigerant flow) system by experimental study and simulation analysis

    AU - Matsumoto, Kuniyasu

    AU - Ohno, Keisuke

    AU - Yamaguchi, Seiichi

    AU - Saito, Kiyoshi

    PY - 2018/1/1

    Y1 - 2018/1/1

    N2 - Recently in Japan, it has been popular to install VRF (Variable Refrigerant Flow) heat pump system to office buildings regardless of size and shape, because many Japanese regard it as the virtue to turn off the air conditioner frequently for energy saving if it is not necessary. This system consists of packaged outdoor unit and multi indoor units connected by refrigerant pipe, and there are some merits for users and owners. For example, it is easy to design for planning building system because of standardized system. Moreover, this system contributes to saving energy and to increasing comfort for users, because it can be operated adequate indoor unit as necessary. On the other hand, because refrigerant flow rate changes dynamically depend on load condition, this system needs complicated control system for keeping stable operation under many manipulating elements. For that reason, it is too difficult to find adequate each elements' condition by only experimental study. In order to evaluate VRF system by easy way, we build the numerical simulation model based on law of physics and we research adequate control condition under various sorts of cooling condition. It is said that conventional control method occurs uns table manipulating condition in case of changing load condition. In this report, we reproduce unstable condition of expansion valve by simulation study.

    AB - Recently in Japan, it has been popular to install VRF (Variable Refrigerant Flow) heat pump system to office buildings regardless of size and shape, because many Japanese regard it as the virtue to turn off the air conditioner frequently for energy saving if it is not necessary. This system consists of packaged outdoor unit and multi indoor units connected by refrigerant pipe, and there are some merits for users and owners. For example, it is easy to design for planning building system because of standardized system. Moreover, this system contributes to saving energy and to increasing comfort for users, because it can be operated adequate indoor unit as necessary. On the other hand, because refrigerant flow rate changes dynamically depend on load condition, this system needs complicated control system for keeping stable operation under many manipulating elements. For that reason, it is too difficult to find adequate each elements' condition by only experimental study. In order to evaluate VRF system by easy way, we build the numerical simulation model based on law of physics and we research adequate control condition under various sorts of cooling condition. It is said that conventional control method occurs uns table manipulating condition in case of changing load condition. In this report, we reproduce unstable condition of expansion valve by simulation study.

    KW - Expansion valve

    KW - Heat pump

    KW - Hunting

    KW - Simulation

    KW - VRF

    UR - http://www.scopus.com/inward/record.url?scp=85058184700&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85058184700&partnerID=8YFLogxK

    M3 - Paper

    AN - SCOPUS:85058184700

    ER -