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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