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An experimental and numerical investigation of HC-600a flow through electronic expansion valves for small refrigerating appliances.

Number: pap. n. 187

Author(s) : KNABBEN F. T., MELO C.

Summary

The present work analyzed the isobutane flow through electronic valves with hydraulic diameters smaller than 0.19mm. Three valves were firstly tested with nitrogen in order to obtain the equivalent capillary tubes. The most promising valves were then tested with isobutane under domestic refrigeration conditions. To this end, a test bench capable of operating with condensation and
evaporation temperatures respectively between 25 and 45°C and -28 and -10°C was constructed. In order to check for choked flow occurrence, complete mass flow curves were additionally obtained for several opening ratios. It was found that the valves are nearly insensible to the sub-cooling degree and that the flow is choked under all practical conditions. Finally, a semi-empirical mathematical model based on a correlation for the flow coefficient was proposed and fitted with a reduced number of points. A reasonable agreement was observed with approximately 94% of the 138 points within a 15% error band.

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Details

  • Original title: An experimental and numerical investigation of HC-600a flow through electronic expansion valves for small refrigerating appliances.
  • Record ID : 30026395
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0187

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