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

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

Effects on Refrigerant Maldistribution on the Performance of Evaporator

냉매의 불균일한 분배가 증발기의 성능에 미치는 영향

  • Published : 2004.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

An experimental investigation was conducted to study two-phase flow distribution in a T-type distributor of slit fin-and-tube heat exchanger using R22. A comparison was made between the predictions by previously proposed tube-by-tube method and experimental data for the heat transfer rate of evaporator. Experiments were carried out under the conditions of saturation temperature of 5$^{\circ}C$ and mass flow rate varying from 0.6 to 1.2kg/min. The inlet air has dry bulb temperature of 27$^{\circ}C$, relative humidity of 50% and air velocity varying from 0.63 to 1.71㎧. Experiment show that air velocity increased by 85.2% is need for T-type distributor with four outlet branches than that of two outlet branches under the superheat of 5$^{\circ}C$, which resulted in air-side pressure drop increase of 130% for T-type distributor with four outlet branches as compared to two outlet branches.

Keywords

References

  1. Korean Journal of Air-Conditioning and Refrigeration Engineering v.14 no.9 Two-phase flow characteristics of refrigerant in T-branch with horizontal and vertical inlet tube Tae,S.J.;Cho,K.
  2. Korean Jouranl of Air-Conditioning and Refrigeration Engineering v.15 no.10 Effects of the temperature glide and superheat of R407C on the performance of evaporator Kim,C.D.;Jeon,C.D.;Lee,J.
  3. Refrigeration-Air Conditioning Engineering v.12 no.1 Two phase flow distibution in multi-parallel evaporator tubes (1st report: Non-heating mode) Kim,J.S.
  4. Korean Journal of Air-Conditioning and Refrigeration Engineering v.11 no.5 Characteristics two-phase flow distibution and pressure drop in a horizontal T-type evaporator tube Park,J.H.;Cho,K.;Cho,H.G.
  5. NISTIR 89-4133 EVSIM-An Evaporator Simulation Model Accounting for Refrigerant and One Dimensional Air Distribution Domanski,P.A.
  6. Proceedings of the SAREK '98 Summer Annual Conference Analytical model of dry surface cross-flow fin-tube heat exchanger by tube-by-tube method Youn,B.;Park,H.Y.;Kim,C.H.
  7. International Journal of Refrigeration v.26 An improved method for analyzing a fin and tube evaporator containing a zeotropic mixture refrigerant with air mai-distribution Lee,J.H.;Kwon,Y.C.;Kim,M.H. https://doi.org/10.1016/S0140-7007(03)00023-9
  8. Korean Jouranl of Air-Conditioning and Refrigeration Engineering v.15 no.3 Evaluation of air-side heat transfer and friction characteristics on design conditions of condenser Kim,C.D.;Jeon,C.D.;Lee,J.
  9. Fundamental Handbook (SI) ASHRAE
  10. Thermodynamic and transport properties of refrigerants and refrigerant mixtures databases (REFPROP), Ver. 6.01 McLinden,M.O.;Klein,S.A.;Lemmon,E.W.;Peskin,A.P.
  11. International Journal of Heat and Mass Transfer v.19 no.3 A general correlation for flow boiling in tubes and annuli Gungor,K.E.;Winterton,R.H.S.
  12. International Journal of Heat and Fluid Flow v.17 Single-phase heat transfer and flow friction correlation for micro fin tubes Wang,C.C.;Chiou,C.C.;Lu,D.C. https://doi.org/10.1016/0142-727X(96)00048-3
  13. ASHRAE Transaction v.96 Performance predictions of refrigerant oil mixtures in smooth and internally finned tube, Ⅱ, design equations Schlager,L.M.;Pate,M.B.;Bergles,A.E.
  14. Proc., 30th National Symposia of Japan Condensation heat transfer of refrigerants HFC134a, HCFC123 and HCFC22 in horizontal smooth tube and a horizontal microfin tube Haraguchi,H.;Koyama,S.;Esaki,J.;Fujii,T.
  15. Heat Transfer Engineering v.4 Heat transfer performance of internally finned tube Carnavos,T.C.
  16. ASHRAE Transactions v.2342 Return bend pressure drop in refrigeration system Geary,F.D.
  17. Transaction of ASME v.3 Pressure loses in smooth pipe bends, Basic Engineering Ito,H.
  18. International Journal of Refrigeration v.12 Heat transfer and pressure drop during evaporation and condensation of R-22 in horizontal micro-fin tubes Schlager,L.M.;Pate,M.B.;Bergles,A.E.
  19. International Journal of Refrigeration v.22 An investigation of the airside performance of the slit fin-and-tube heat exchangers Wang,C.C.;Tao,W.H.;Chang,C.J. https://doi.org/10.1016/S0140-7007(99)00031-6
  20. Heating, Ventilating, and Air Conditioning Analysis and Design McQuiston,F.C.;Parker,J.D.
  21. SHASE Transactions (The Society of Heating, Air-conditioning and Sanitary Engineers of Japan) v.44 Natio,N.
  22. Tae, S.J. and Cho, K., 2002, Two-phase flow characteristics of refrigerant in Tbranch with horizontal and vertical inlet tube, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No.9, pp.741-748