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

Translated title of the contribution: Numerical analysis of control characteristics of variable refrigerant flow heat-pump systems focusing on the effect of expansion valve and indoor fan

Kuniyasu Matsumoto, Keisuke Ohno, Seiichi Yamaguchi, Kiyoshi Saito

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    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.

    Translated title of the contributionNumerical analysis of control characteristics of variable refrigerant flow heat-pump systems focusing on the effect of expansion valve and indoor fan
    Original languageFrench
    Pages (from-to)440-452
    Number of pages13
    JournalInternational Journal of Refrigeration
    Volume99
    DOIs
    Publication statusPublished - 2019 Mar 1

    Keywords

    • Energy efficiency
    • Heat-pump
    • Simulation
    • System control
    • Validation
    • Variable refrigerant flow (VRF) systems

    ASJC Scopus subject areas

    • Building and Construction
    • Mechanical Engineering

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