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Gas-liquid distributions of refrigerant flows in multi-pass channels with vertical headers - Influence of heating of branch tubes on liquid distribution characteristics -

Number: 0252

Author(s) : ONODERA A., HATADA T., SAWAHARA F., MORI K., HIROTA M., NISHIMURA A., MARUYAMA N.

Summary

For the gas-liquid two-phase refrigerant flow in the multi-pass channel with a vertical header and horizontal branch tubes that simulates the parallel-flow type heat exchanger used for residential and commercial air conditioners, the influence of evaporation of liquid refrigerant in branch tubes on the gas-liquid distribution characteristics in the channel was experimentally investigated. The test channel had a vertical header with a height of 81.5 mm and 8 horizontal aluminium microchannel branch tubes connected in parallel to the it at a pitch of 10 mm, and all the branch tubes were heated evenly at 20 – 100 W/tube. It was found that excessive liquid distribution to the lowermost branch tube was suppressed, while the amount of liquid distributed to the upper branch tubes increased by heating the branch tubes. As a result, the uniformity of the liquid distribution was improved by the evaporation of liquid refrigerant in branch tubes.

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Pages: 10 p.

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Details

  • Original title: Gas-liquid distributions of refrigerant flows in multi-pass channels with vertical headers - Influence of heating of branch tubes on liquid distribution characteristics -
  • Record ID : 30031590
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0252

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