Effect of refrigerant mal-distribution in fin-and-tube evaporators on system performance

Martin Ryhl Kærn, Brian Elmegaard, Lars Finn Sloth Larsen

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    Abstract

    Refrigerant mal-distribution in fin-and-tube evaporators for residential air-conditioning (RAC) is investigated numerically in this paper. A model of the system is developed in the object-oriented modeling language Modelica. Themodels of the compressor and expansion valve are static, whereas the condenser is a dynamic moving boundary model. The evaporator model is a dynamic distributed one-dimensional homogeneous equilibrium model, in order to capture the distribution phenomena. Fin-and-tube heat exchangers usually have a complex circuitry, however the evaporator will be simplified to be two straight tubes. The refrigerant mal-distribution is then induced to the evaporator by varying the vapor quality at the inlet to each feeder tube, the pressure drop through each feeder tube and the air-flow across each tube. Finally it is shown that air-flow mal-distribution can be compensated by an intelligent distributor, that ensures equal superheat in both tubes. The refrigerant is R410a.
    Original languageEnglish
    Title of host publicationProceedings of SIMS 50 : Modeling of Energy Technology
    Place of PublicationKgs. Lyngby
    PublisherTechnical University of Denmark
    Publication date2009
    Pages315-322
    ISBN (Print)978-87-89502-88-5
    Publication statusPublished - 2009
    Event50th International Conference of Scandinavian Simulation Society - Fredericia, Denmark
    Duration: 7 Oct 20098 Oct 2009
    Conference number: 50

    Conference

    Conference50th International Conference of Scandinavian Simulation Society
    Number50
    Country/TerritoryDenmark
    CityFredericia
    Period07/10/200908/10/2009

    Keywords

    • Air-conditioning
    • Evaporator
    • Modelica
    • Mal-distribution
    • Modeling

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