Heat transfer characteristics of R - 407C condensing inside smooth horizontal tubes

냉매 R-407c의 수평평골 응축관내 열전달특성에 관한 연구

  • 오후규 (부경대학교 냉동공조공학과) ;
  • 문정욱 (부경대학교 대학원 내동공조공학과) ;
  • 노건상 (동명전문대학 가스냉동과)
  • Published : 1997.04.01

Abstract

Experimental results for forced convection heat transfer of pure refrigerant and nonrefrigerant mixtures during condensing inside horizontal smooth tubes, double pipe heat exchanger of 7.5 mm ID and 4 000 mm long inside tube, are presented. Pure refrigerant R - 22 and R - 407 c, the mixture of R - 32 + R - 125 + R - 134a (23/25/52, wt %) are used as the test fluids. The ranges of parameters are $114.3{\sim}267.1 kg/(m^2 {\cdot} s)$ of mass velocity, <0$\sim$1.0 of quality. The vapor pressure, vapor temperature and tube wall temperature were measured. Using these data, the local and average heat transfer coefficients for the condensation are obtained. At the same given experimental conditions, the condensation heat transfer coefficients for NARMs R - 407c were lower than those for the pure refrigerant of R - 22. Local heat transfer characteristics for R - 407c were different from pure refrigerant R - 22. The condensaheat transfer coefficients for R - 407c and R - 22 increased with mass velocity. Based on the data a prediction method was presented for the calculation of dimensionless average heat transfer coefficient.

Keywords

References

  1. Intl. J. Ref. v.12 no.9 First Industrial Application of Nonazeotropic Mixture Blaise, J. C.;Dutto, T;Ambrosino, J. L.
  2. ASHRAE Trans v.94 Laboratory Testing of a Heat Pump System Using an R13B1/R152a Refrigerant Mixture Vineyard, E. A.
  3. 日本機械學會熱工學講演會講演論文集 水平管內面形狀改善による非共沸混合冷媒の傳熱性能向上(I)(凝縮熱傳達率の實驗的檢討) 內田麻理;伊藤正昭;工藤光夫
  4. Chem. Eng. Progr. Sym. Ser. v.55 Condensation Heat Transfer within Horizontal Tubes Akers, W. W.;Deans, H. A.;O. K. Crosser
  5. Proc. 6th Intl. Heat Transfer Conf. v.3 A Dimensionless Correlation for Heat Transfer in Forced Convection Condensation Cavallini, A.;Zecchin R.
  6. Intl. J. Heat Mass Transfer v.22 A General Correlation for Heat Transfer during Film Condensation inside Pipes Shah, M. M.
  7. ASHRAE Trans. v.98 Prediction of the Heat Transfer Characteristics of R-22/R-152a/R-114 and R-22R-152a/R-124 Sami, S. M.;Schnotale, J.;Smale, J. G.
  8. 日本機械學會熱工學講演會講演論文集 水平管內面形狀改善による非共沸混合冷媒の傳熱性能向上(I)(凝縮熱傳達率の實驗的檢討) 內田麻理;伊藤正昭;工藤光夫
  9. 日本機械學會熱工學講演會講演論文集 水平管內面形狀改善による非共沸混合冷媒の傳熱性能向上(I)(蒸發熱傳達率の實驗的檢討) 伊藤正昭;內田麻理;工藤光夫
  10. 日本機械學會熱工學講演會論文集 非共沸混合冷媒HFC32/125の水平管內熱傳達特性 蝶子穀;奧山和之;鳥越邦和
  11. 日本機械學會論文集(B編) v.60 no.574 冷媒HCFC 22, HFC 134a, HCFC123の水平平滑管內凝縮(第2報, 局所熱傳達係數に關する實驗式の提案 原口英岡;小山繁;藤井哲
  12. 日本機械學會論文集(B編) v.54 no.502 非共沸混合冷媒R22+R114の水平管內凝縮 小山繁;宮良明男;藤井哲;高松洋;米本和生