IIR document

Analysis of air flow distribution in refrigeration systems.

Author(s) : BRIX W., JAKOBSEN A., RASMUSSEN B. D., et al.


A simulation model with heat transfer and pressure drop properties based on existing correlations was built to investigate the influence of unevenly distributed air flows on a microchannel evaporator. On the refrigerant side liquid overfeed is used in the evaporator and on the air side only dry air is considered to flow through the evaporator. The simulation model was used to analyze the capacity degradation caused by the airflow nonuniformity. It was found that the cooling capacity of the heat exchanger was decreased by 20% for extreme maldistributions of the airflow. However, for not so severe airflow maldistributions, the degradation of the overall heat transfer coefficient was limited. Finally, the evaporator model was built into a relatively simple refrigeration system model in order to analyse influence of the airflow maldistribution on the total system performance. It was found that the degradation of the COP was only 4% in the extreme case and negligible for all air flow distributions that were not severely non-uniform.

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Pages: ICR07-B2-581


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  • Original title: Analysis of air flow distribution in refrigeration systems.
  • Record ID : 2008-0141
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21


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