Comparison of Condenser Characteristics Using R407C and R22 on the Same Inlet Temperature Condition

동일한 유입온도조건에서 R407C와 R22 적용 응축기의 특성비교

  • Published : 2003.07.01

Abstract

R407C is considered as an alternative refrigerant to R22 for air conditioners. An experimental investigation was made to study the characteristics of the condensation heat transfer and pressure drop for R407C flowing in a fin-and-tube heat exchanger used for commercial air-conditioning units. Experiments were carried out under the conditions of inlet refrigerant temperature of 6$0^{\circ}C$ and refrigerant mass flux varying from 150 to 250 kg/$m^2$s for refrigerant side. The inlet air has dry bulb temperature of 35$^{\circ}C$ , relative humidity of 50% and air velocity varying from 0.8 to 1.6 m/s. Experiments show that air velocity increased by 25% is needed for R407C than that of R22 for subcooling temperature of 5$^{\circ}C$, which resulted in air-side pressure drop increase of 28.8% for R407C as compared to R22. As a consequence, in order to provide the same design condition of a condenser, the fan requires higher electric-power consumption with R407C than that with R22.

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References

  1. Final Act, United Nations Environment Programme Montreal Protocol on Substance that Deplete the Ozone Layer
  2. korean Journal of Air-Conditioning and Refrigerating Engineering v.14 no.9 An experimental study on condensation characteristics of slit fin-tube heat exchanger using alternative refrigerants,R407C and R410A Jeon,C.D.;Jang,K.K.;Kang,S.H.;Lee,J.
  3. Korean Journal of Air-Conditioning and Refrigerating Engineering v.15 no.3 An experimental study on condensation characteristics at various condensation pressure of R407C Jeon,C.D.;Jang,K.K.;Kim,C.D.;Lee,J.
  4. 33rd National Heat Transfer Symposium of Japan v.2 A study thermal performance of air-cooled heat exchangers using alternative refrigerant Ebisu,T.;Kasai,D.;Torikoshi,K.
  5. Journal of Energy Research v.24 Heat transfer prediction of air-to-refrigerant two-phase flow boiling of alternatives to HCFC-22 inside air/refrigerant enhanced surface tubing Sami,S.M.;Grell,J.
  6. Applied Thermal Engineering v.16 Horizontal flow boiling of R22 and R407C in a 9.52mm micro-fin tube Kuo,C.S.;Wang,C.C.
  7. Korean Journal of Air-Conditioning and Refrigerating Engineering v.13 no.4 Flow boiling heat transfer characteristics of R22 alternative refrigerants in a horizontal smooth tube Han,J.U.;Kim.S.J.;jung,D.S.;Kim,Y.I.
  8. ASHRAE Transaction, Symposia v.16 Experimental study on evaporation and condensation heat transfer enhancement for R-407C using herringbone heat transfer tube Ebisu,T.;Torikoshi.K.
  9. Fundamental Handbook(SI) ASHRAE
  10. Thermodynamic and transport properties of refrigerants and refrigerant mixtures database(REFPROP) Ver.6.01 McLinden,M.O.;Klein,S.A.;Lemmon,E.W.;Peskin,A.P.
  11. Mechanical Engineering v.75 Describing uncertainties in single sample experiments Kline,S.J.;McClintock,F.A.
  12. Int. J. Heat and Fluid Flow v.18 Two-phase heat transfer characteristics for R22/R407C in a 6.5mm smooth tube Wang,C.C.;Chiang,C.S.
  13. International Journal Refrigeration v.24 Experimental investigation on condensation heat transfer and pressure drop of new HFC refrigerants Cavallini,A.;Censi,G;Col,D.;Doretti,L.;Longo,G.A.;Rossetto,L.