Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance of Short Tube Orifices Using R-410A Near the Critical Region

R-410A 임계영역 운전조건에서 오리피스의 성능특성에 관한 연구

  • Choi, Jong-Min (Department of Mechanical Engineering, Hanbat National University) ;
  • Kim, Yong-Chan (Department of Mechanical Engineering, Korea University)
  • Published : 2005.12.01
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Abstract

An experimental investigation was performed to develop an empirical correlation of R-410A flowing through short tube orifices working near the critical region. Tests were executed by varying upstream pressure from 2,619 kPa to 4,551 kPa, and upstream subcooling from 2.8 and $11.1^{\circ}C$. The experimental data were represented as a function of major operating parameters and short tube diameter. As compared to mass flow trends at normal upstream pressures, flow dependency on upstream subcooling became more significant at high upstream pressures due to a higher density change. Based on the database obtained from this study and literature, an empirical correlation was developed from a power law form of dimensionless parameters generated by the Buckingham Pi theorem. The correlation yielded good agreement with the data. Approximately $92\%$ of the data were correlated within a relative deviation of $5\%$.

Keywords

References

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