International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Convective Boiling of R-l34a in a Bundle of Smooth Tubes

  • Kim, Jung-Oh (Graduate School, University of Inchon) ;
  • Cho, Jin-Pyo (Graduate School, University of Incho) ;
  • Kim, Nae-Hyun (Department of Mechanical Engineering, University of Incho) ;
  • Choi, Kuk-Kwang (Department of Mechanical Engineering, University of Inchon)
  • Published : 2002.06.01
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Abstract

In this study, flow boiling experiments were performed using R-134a on a plain tube bundle. Tests were conducted for the following range of variables; quality from 0.1 to 0.9, mass flux from 8kg/$m^2$s to 26 kg/$m^2$s and heat flux from 10kW/$m^2$ to 40kW/$m^2$. The heat transfer coefficients were strongly dependent on the heat flux. However, they were almost independent on the mass flux or quality. The data are compared with the modified Chen model, which predicted satisfactorily ($\pm$30%) the data. The Original Chen model, however, did not adequately predict the effect of quality. The reason may be attributed to the flow pattern of the present test, where the bubbly flow prevailed for the entire test range. The heat transfer coefficients of the tube bundle were 6~40% higher than those of the single tube pool boiling.

Keywords

References

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