Analyse numérique des caractéristiques de régulation des systèmes de pompe à chaleur à débit de frigorigène variable en se concentrant sur l'effet du détendeur et du ventilateur intérieur

Kuniyasu Matsumoto, Keisuke Ohno, Seiichi Yamaguchi, Kiyoshi Saito

    研究成果: Article

    抄録

    In commercial and office buildings, it has recently become popular to install variable refrigerant flow (VRF) compression-type heat pump systems. In particular, VRF systems with multiple indoor units are being installed in large buildings because such systems have large adjustment capacity. On the other hand, because users of VRF systems can freely choose the number of indoor units to install and can turn indoor units on and off independently, operating conditions are not predictable and it is difficult to find adequate control parameters under wide changes in load. With this background, we are developing a new numerical simulation model based on the laws of physics. Because this model can easily add and delete system elements, we believe that it will be useful for VRF system analysis. In this study, we utilize a numerical simulation model to evaluate both steady and unsteady conditions in VRF systems. In this paper, we focus on the connection between manipulated variables (the expansion valve's open pulse and fan rotational speed) and controlled variables (supply air temperature and the degree of superheating at the evaporator outlet). Moreover, we compare the difference between the performance of a single indoor unit and that of multiple indoor units operating simultaneously. As a result, we can evaluate the dynamic characteristics of manipulated variables and the effect of changing the number of active indoor units, each of which has their own VRF characteristics.

    寄稿の翻訳されたタイトルNumerical analysis of control characteristics of variable refrigerant flow heat-pump systems focusing on the effect of expansion valve and indoor fan
    元の言語French
    ページ(範囲)440-452
    ページ数13
    ジャーナルInternational Journal of Refrigeration
    99
    DOI
    出版物ステータスPublished - 2019 3 1

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    Plant expansion
    Heat pump systems
    Fans
    Numerical analysis
    Flow of fluids
    Office buildings
    Computer simulation
    Evaporators
    Physics
    Systems analysis
    Air

    Keywords

      ASJC Scopus subject areas

      • Building and Construction
      • Mechanical Engineering

      これを引用

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      title = "Analyse num{\'e}rique des caract{\'e}ristiques de r{\'e}gulation des syst{\`e}mes de pompe {\`a} chaleur {\`a} d{\'e}bit de frigorig{\`e}ne variable en se concentrant sur l'effet du d{\'e}tendeur et du ventilateur int{\'e}rieur",
      abstract = "In commercial and office buildings, it has recently become popular to install variable refrigerant flow (VRF) compression-type heat pump systems. In particular, VRF systems with multiple indoor units are being installed in large buildings because such systems have large adjustment capacity. On the other hand, because users of VRF systems can freely choose the number of indoor units to install and can turn indoor units on and off independently, operating conditions are not predictable and it is difficult to find adequate control parameters under wide changes in load. With this background, we are developing a new numerical simulation model based on the laws of physics. Because this model can easily add and delete system elements, we believe that it will be useful for VRF system analysis. In this study, we utilize a numerical simulation model to evaluate both steady and unsteady conditions in VRF systems. In this paper, we focus on the connection between manipulated variables (the expansion valve's open pulse and fan rotational speed) and controlled variables (supply air temperature and the degree of superheating at the evaporator outlet). Moreover, we compare the difference between the performance of a single indoor unit and that of multiple indoor units operating simultaneously. As a result, we can evaluate the dynamic characteristics of manipulated variables and the effect of changing the number of active indoor units, each of which has their own VRF characteristics.",
      keywords = "Energy efficiency, Heat-pump, Simulation, System control, Validation, Variable refrigerant flow (VRF) systems",
      author = "Kuniyasu Matsumoto and Keisuke Ohno and Seiichi Yamaguchi and Kiyoshi Saito",
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      TY - JOUR

      T1 - Analyse numérique des caractéristiques de régulation des systèmes de pompe à chaleur à débit de frigorigène variable en se concentrant sur l'effet du détendeur et du ventilateur intérieur

      AU - Matsumoto, Kuniyasu

      AU - Ohno, Keisuke

      AU - Yamaguchi, Seiichi

      AU - Saito, Kiyoshi

      PY - 2019/3/1

      Y1 - 2019/3/1

      N2 - In commercial and office buildings, it has recently become popular to install variable refrigerant flow (VRF) compression-type heat pump systems. In particular, VRF systems with multiple indoor units are being installed in large buildings because such systems have large adjustment capacity. On the other hand, because users of VRF systems can freely choose the number of indoor units to install and can turn indoor units on and off independently, operating conditions are not predictable and it is difficult to find adequate control parameters under wide changes in load. With this background, we are developing a new numerical simulation model based on the laws of physics. Because this model can easily add and delete system elements, we believe that it will be useful for VRF system analysis. In this study, we utilize a numerical simulation model to evaluate both steady and unsteady conditions in VRF systems. In this paper, we focus on the connection between manipulated variables (the expansion valve's open pulse and fan rotational speed) and controlled variables (supply air temperature and the degree of superheating at the evaporator outlet). Moreover, we compare the difference between the performance of a single indoor unit and that of multiple indoor units operating simultaneously. As a result, we can evaluate the dynamic characteristics of manipulated variables and the effect of changing the number of active indoor units, each of which has their own VRF characteristics.

      AB - In commercial and office buildings, it has recently become popular to install variable refrigerant flow (VRF) compression-type heat pump systems. In particular, VRF systems with multiple indoor units are being installed in large buildings because such systems have large adjustment capacity. On the other hand, because users of VRF systems can freely choose the number of indoor units to install and can turn indoor units on and off independently, operating conditions are not predictable and it is difficult to find adequate control parameters under wide changes in load. With this background, we are developing a new numerical simulation model based on the laws of physics. Because this model can easily add and delete system elements, we believe that it will be useful for VRF system analysis. In this study, we utilize a numerical simulation model to evaluate both steady and unsteady conditions in VRF systems. In this paper, we focus on the connection between manipulated variables (the expansion valve's open pulse and fan rotational speed) and controlled variables (supply air temperature and the degree of superheating at the evaporator outlet). Moreover, we compare the difference between the performance of a single indoor unit and that of multiple indoor units operating simultaneously. As a result, we can evaluate the dynamic characteristics of manipulated variables and the effect of changing the number of active indoor units, each of which has their own VRF characteristics.

      KW - Energy efficiency

      KW - Heat-pump

      KW - Simulation

      KW - System control

      KW - Validation

      KW - Variable refrigerant flow (VRF) systems

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