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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Experiments on Condensation Heat Transfer Characteristics and Flow Regime Inside Microfin Tubes

마이크로핀관내 유동 양식과 응축 열전달 특성 연구

  • 한동혁 (고려대학교 대학원 기계공학과) ;
  • 이규정 (고려대학교 기계공학과)
  • Published : 2001.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Experiments on the condensation heat transfer characteristics inside a smooth and a microfin tube with R410A/R22 are performed in this study. The test tubes 7/9.52 mm in outside diameters and 3m in length are used. Varying the mass flux of the refrigerant and the condensation temperatures, the average heat transfer coefficients and pressure drop are investigated. Most flows in this study are in the annular and/or wavy flow regime. It is shown that the heat transfer is enhanced and the pressure drops are larger in the microfin tube than the smooth tube. From the heat transfer enhancement coefficients and the pressure drops, it is found that the high heat transfer enhancement factors are obtained in the range of small mass flux while the penalty factors are almost equal. Experiments results show that average heat transfer coefficients of R410A is larger than that of R22 and pressure drop of R410A is less than R22.

Keywords

References

  1. Hitachi Cable Review no.4 Development of an Improved Thermofin Tube Shinohara, Y.;Tobe, M
  2. Heat Transfer in Air Conditioning and Refrigeration Equipment v.6 Augumentation of R113 In-Tube Condensation with Microfin Tubes Khanpara, J. C.;Bergles, A. E.;Pate, M. B.;Kohler, J. A.(ed.);Lu, J.W.B.(ed.)
  3. Shindo-Gyzyutsu Kenkyuukai-shi v.29 Heat transfer characteristics of internally grooved tubes Shinohara, Y.;Hori, M.
  4. Journal of Offshore Mechanics and Arctic Engineering v.112 Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal, 12.7mm Microfin Tubes with refrigerant 22 Schlager, L. M.
  5. ASHRAE Transactions v.92 no.2 In tube evaporation and condensation of refrigerant lubraicant mixtures of HFC134a and CFC-12 Eckels,S.J.;Pate,M.B.
  6. Int. J. Heat Transfer v.39 no.9 Advanced Microfin Tubes for Condensation Chamra, L. M.;Webb, R. L.
  7. Int. J. Heat and Mass Transfer v.39 no.12 In-tube evaporation of HCFC-22 in a 9.52mm micro-fin/smooth tube Kuo, C. S.;Wang, C. C.
  8. Experimental Thermal and Fluid Science v.18 Condensation of a refrigerant CFC11 in horizontal microfin of a refrigerant CFC11 in horizontal microfin tubes Shigeru, N.;Hiromasa, K.
  9. Int. J. Refrig. v.23 Heat transfer and pressure drop condensation of refrigerants inside horizontal enhanced tubes Cavallini, A.;Del Col, D.;Doretti, L.;Longo, G. A.;Rossetto, L.
  10. NISTIR 6095 Horizontal convective condensation of alternative refrigerants within a microfin tube Kedzierski,M.A.;Goncalves,J.M.
  11. Int. Refrig. Conf. at Purdue Condensation heat transfer of pure refrigerants in microfin tubes Yu,J.;Koyama,S.
  12. 9th., International Heat Transfer Conference Flow pattern transtion in two-phase flow Taitel, Y.;Dukler, A. E.
  13. Canadian Journal of Chemical Engineering v.60 On the annular to wavy flow pattern transition during condensation inside horizontal tubes Soliman,M.M.
  14. Handbook of Hydraulic Resistance(3rd ed.) Idelchik, I. E.
  15. International Journal of Heat and Mass Transfer v.22 A General Correlation for Heat Transfer During Film Condensation Inside Pipes Shah,S.A.
  16. ASHRAE v.79 Forced convection inside Tubes Traviss, D. P.;Rohsenow, W. M.
  17. 5th International Heat Transfer Conference A Dimensionless Correlation for the Heat Transfer in forced Convective Condensation Cavallini,A.;Zecchin,R.
  18. KSME v.24 Experiments on Condensation Heat Transfer Characteristics inside a microfin Tube with R410A Han,D.H.;Cho,Y.J.;Lee,K.J.;Park,S.S.