Study on the pressure drop of ternary refrigerant R-407c during condensation inside horizontal micro-fin tubes

3성분 혼합냉매 R-407c의 수평 마이크로핀관내 응축압력강하에 관한 연구

  • 정재천 (부경대학교 대학원 냉동공조공학과)
  • Published : 1998.03.01

Abstract

Experimental results for forced convection condensationof Refrigerant-22 and ternary Refrigerant-407c(HFC-32/125/134a 23/25/52 wt%) considered as a substitute R-22 inside horizontal micor-fin tubes are presented. The test section was horizontal double-tubed counterflow condenser with a length 4000 mm micro-fin tube having 9.53 mm OD., 0.2 mm fin height and 60 fins. The refrigerants R-22 and R-407c were cooled by a coolant circulated in a surrounding annulus. The range of parameters of mass velocity was varied from 102.1 to 301.0kg/($\textrm{m}^{2}.s$) with inlet quality 1.0. Both refrigerant R-22 and its alternative refrigerant R-407c were tested within the same range of parameters. At the given experimental conditions for R-22 and R-407c the pressure drops for R-407c were considerably higher than those for R-22 at micro-fin tubes. Over the mass velocity range tested the PF(penalty factor)was lower than the increasing ratio of heat transfer area by fins. Based on the data correlation was proposed for predicting the frictional pressure drops for R-22 and R-407c for a duration of condensation inside a horizontal micro-fin tube.

Keywords

References

  1. DOE/ORNL Heat Pump Conf. Proc. Evaluation of Nonazeotropic Refrigerant Mixtures for Capacity ModulationD Vineyard, E. A.;Sand, J. K.
  2. ASHRAE Trans. v.94 Evaporation and Condensation of Refrigerant-Oil Mixtures in a Smooth Tube and a Micro-fin Tube Schlager, L. M.;Pate, M. B.;Bergles, A. E.
  3. Intl. J. Ref. v.13 no.7 Condensation Heat Transfer of Binary Refrigerant Mixtures of R22 and R114 inside a Horizontal Tube with Internal Sprial Grooves Koyama, S.;Miyara, A.;Takamatus, H.;Fujii, T.
  4. 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全熱性能向上(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
  5. ASHRAE Trans. v.97 Effect of Oil on Heat Transfer and Pressure Drop duting Condensation of Refrigerant-113 inside Smooth and Internally Finned Tubes Sur, B.;Azer, N. Z.
  6. ASHRAE Trans. v.98 Predictin of the Heat Transfer Characteristics of R-22/R-152a/R-114 and R-22/R-152a/R124 Sami, S. M.;Schnotale, J.;Smale, J. G.
  7. 第29回 空氣調和 冷凍聯合講演會講演論文集 非共沸混合冷媒HFC-32/125/134a の傳熱促進に關す硏究る 筮至子穀;戶田一美;奧山和之;鳥越邦和
  8. 한국박용기관학회지 v.20 no.4 냉매 R-22, R-407c의 수평평활관내 압력강하에 관한 연구 노건상;오후규;권옥배
  9. NIST Standard Reference Database 23 NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database(REFPROP) ver -5.0- M. Huber;J. Gallagher, M.;McLinden;G. Morrison
  10. 한국박용기관학회 v.21 no.2 냉매 R-407c의 수평평활 응축관내 열전달특성에 관한 연구 노건상;문정욱;오후규
  11. Refrigeration v.59 no.683 Recent Development of Heat Transfer Tubes for Refrigeration and Air Conditioning(in Japanese) Hozumi, H.;Ito, Y.;Shinohara, Y.
  12. ASHRAE Trans. v.92 An Experimental Investigatin of Pressure Drop in Forced-Convectiobn Condensation and Evaporation of Oil-Refrigerant Mixtures Tichy, J. A.;Duque-Rivera, J.;Macken, N. A.;Duval, W. M. B.
  13. ASHRAE Trans. v.96 A General Pressure Drop Correlation for Condensaton insied Internally Finned Tubes Kaushik, N.;Azer, N. Z.
  14. ASHRAE Trans. v.97 An Analytical Pressure Drop Prediction Model for Condensation inside Longitudinally Finned Tubes Sur, B.;Azer, N. Z.
  15. J. Heat Transfer v.90 A General Heat Transfer Correlation for Annular Flow Condensation Soliman, M.;Schuster, J. R.;Berenson, P. J.
  16. ASHRAE Trans. v.78 Local Heat Transfer Coefficients during Annular Flow Condensation Azer, N. Z.;Abis, L. V.;Soliman, H. M.
  17. 日本機械學會論文集(B編) v.42 no.363 冷媒R-11の平管內凝縮 (第1報, 流動樣式およぴ壓歷降下) 藤井哲;本田博司;長田孝志;藤井不夫;野律滋
  18. Trans. of the JAR v.6 no.1 Condensation of Non-Azeotropic Refrigerant Blends of R114 and R113 in a Horizontal Anuulus with an Enhanced Inner Tube(in Japanese) Nozu, S.;Honda, H.;Aoyama, T.;Shibukuwa, K.