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

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

Flow Condensation Heat Transfer Coefficients of R22 Alternative Refrigerants in Plain and Microfin Tubes of 6.0 mm Inside Diameter

내경 6 mm 평관과 마이크로 핀관 내에서 R22 대체냉매의 흐름응축 열전달계수

  • Published : 2004.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Flow condensation heat transfer coefficients (HTCs) of R22, R134a, R407C, and R410A were measured on horizontal plain and microfin tubes. The experimental apparatus was composed of three main parts; a refrigerant loop, a water loop and a water/glycol loop. The test section in the refrigerant loop was made of both a plain and a microfin copper tube of 6.0∼6.16 mm inside diameter and 1.0 m length. Refrigerants were cooled by passing cold water through an annulus surrounding the test section. Tests were performed at a fixed refrigerant saturation temperature of 4$0^{\circ}C$ with mass fluxes of 100, 200, and 300 kg/m2s. Test results showed that at similar mass flux the flow condensation HTCs of R134a were similar to those of R22 for both plain and microfin tubes. On the other hand, HTCs of R407C were lower than those of R22 by 4∼16% and 16∼42% for plain and microfin tubes respectively. And HTCs of R410A were similar to those of R22 for a plain tube but lower than those of R22 by 3∼9% for a microfin tube. Heat transfer enhancement factors of a microfin tube were 1.3∼1.9.

Keywords

References

  1. Montreal Protocol on Substances that Deplete the Ozone Layer United Nations Environment Programme
  2. Condensation of fluorcarbon and other refrigerants: a state-of-the-art review(ARI report) Thome,J.R.
  3. Korean Journal of Air-Conditioning and Refrigeration Engineering v.14 no.2 Flow condensation heat transfer coefficients of pure refrigerants Kim,S.J.;Song,K.H.;Jung,D.
  4. Korean Journal of Air-Conditioning and Refrigeration Engineering v.14 no.8 Flow condensation heat transfer of R22, R134a, R407C, and R410A in plain and microfin tubes Cho,Y.M.;Park,K.H.;Song,K.H.;Jung,D.
  5. Mechanical Engineering v.75 Describing uncertainties in single sample experiments Kline,S.J.;McClintock,F.A.
  6. Process Heat Transfer Hewitt,G.F.;Shires,G.L.;Bott,T.R.
  7. ASHRAE Trans. v.97 Evaporation and condensation of HFC-134a and CFC-12 in a smooth and a microfin tube Eckels,S.J.;Pate,M.B.
  8. Chem. Eng. Prog. Symp. Ser. v.56 Condensation inside a horizontal tube Akers,W.W.;Rosson,H.F.
  9. J. Heat Transfer v.90 A general heat transfer correlation for annular flow condensation Soliman,H.M.;Schuster,J.R.;Berenson,P.J.
  10. ASHRAE Trans. v.79 Forced convection condensation in tubes: A heat transfer correlation for condenser design Traviss,D.P.;Rohsenow,W.M.;Baron,A.B.
  11. Proceedings of the Fifth International Heat Transfer Conference v.3 A dimensionless correlation for heat transfer in forced convection condensation Cavallini,A.;Zecchin,R.
  12. International Journal of Heat Mass Transfer v.22 A general correlation for heat transfer during film condensation in-side pipes Shah,M.M. https://doi.org/10.1016/0017-9310(79)90058-9
  13. ASHRAE Trans. An experimental investigation of forced convection condensation during annular flow inside a horizontal tube Tandon,T.N.;Varma,H.K.;Gupta,C.P.
  14. Int. J. of Refrigeration v.18 no.3 Heat transfer during convection condensation inside horizontal tube Tandon,T.N.;Varma,H.K.;Gupta,C.P. https://doi.org/10.1016/0140-7007(95)90316-R
  15. ASME J. Heat Transfer v.120 Condensation in smooth horizontal tubes Dobson,M.K.;Chato,J.C. https://doi.org/10.1115/1.2830043