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

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2009

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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
StatePublished

Conference

Conference50th International Conference of Scandinavian Simulation Society
Number50
CountryDenmark
CityFredericia
Period07/10/0908/10/09

Keywords

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