Performance of residential air-conditioning systems with flow maldistribution in fin-and-tube evaporators

Martin Ryhl Kærn, Wiebke Brix, Brian Elmegaard, Lars Finn Sloth Larsen

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    Abstract

    Refrigerant and airflow maldistribution in fin-and-tube evaporators for residential air-conditioning was investigated with numerical modeling. Fin-and-tube heat exchangers usually have a pre-defined circuitry. However, the objective in this study was to perform a generic investigation of each individual maldistribution source in an independent manner. Therefore, the evaporator and the condenser were simplified to be straight tubes for the purposes of this study. The numerical model of the R410A system, its verification and an investigation of individual maldistribution sources are presented in this paper. The maldistribution sources of interest were: inlet liquid/vapor phase distribution, feeder tube bending and airflow distribution. The results show that maldistribution reduced the cooling capacity and the coefficient of performance of the system. In particular, different phase distribution and non-uniform airflow distribution reduced the performance significantly. Different feeder tube bendings only caused a minor decrease in performance.
    Original languageEnglish
    JournalInternational Journal of Refrigeration
    Volume34
    Issue number3
    Pages (from-to)696-706
    ISSN0140-7007
    DOIs
    Publication statusPublished - 2011

    Bibliographical note

    Title in French: Performance des systèmes de conditionnement d’air résidentiels avec une mauvaise distribution de l’écoulement dans les évaporateurs à tubes ailetés
    Post-print: Creative Commons Attribution-Non-Commercial-No Derivatives

    Keywords

    • Air conditioning
    • Simulation
    • Finned tube
    • Cooling
    • Modeling

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