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Numerical simuation of two-phase flow distribution in a vertically installed refrigerant distributor.

Number: No 022

Author(s) : CHOI S., LEE H., JEONG J.

Summary

If two-phase flow occurs in the Variable Refrigerant Flow (VRF) system air conditioner, the distribution characteristic may be changed, and uneven distribution problem will occur. In addition, changing the orientation of the refrigerant distributor from horizontal to vertical in order to reduce the installation space, this uneven distribution becomes even worse. In this study, computational fluid dynamics (CFD) simulation is used to calculate uneven distribution of two-phase flow in a vertically installed distributor and to analyze the factors affecting the uneven distribution by analyzing the internal flow. CFD results are validated by the previous experimental results. Due to the momentum difference, liquid phase flows toward the end of the header and the gas phase flows near the inlet. Uneven distribution is exacerbated as the void fraction increased. The geometry of the header is modified to improve the non-uniform distribution and the result are compared with the existing data.

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Pages: 9 p.

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Details

  • Original title: Numerical simuation of two-phase flow distribution in a vertically installed refrigerant distributor.
  • Record ID : 30029921
  • Languages: English
  • Subject: Technology
  • Source: 13th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
  • Publication date: 2021/08/31

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