Experimental investigation of condensation heat transfer and pressure drop of R22, R410A and R407C in mini-tubes

Condensation heat transfer and pressure drop of R22, R410A and R407C were investigated experimen- tally in two single round stainless steel tubes with inner diameter of 1.088 mm and 1.289 mm. Conden- sation heat transfer coefficients and two phase pressure drop were measured at the saturation temperatures of 30 C and 40 C. The mass flux varies from 300 to 600 kg/m 2 s and the vapor quality 0.1-0.9. The effects of mass flux and vapor quality were investigated and the results indicate that conden- sation heat transfer coefficients increase with mass flux and vapor quality, increasing faster in the high vapor quality region. The experimental data was compared with the correlations based on experimental data from large diameter tubes (dh > 3 mm), such as the Shah and Akers correlations et al. Almost all the correlations overestimated the present experimental data, but Wang correlation and Yan and Lin corre- lation which were developed based on the experimental data from mini-tubes predicted present data reasonably well. Condensation heat transfer coefficients and two phase pressure drop of R22 and R407C are equivalent but both higher than those of R410A. As a substitute for R22, R410A has more advantages than R407C in view of the characteristics of condensation heat transfer and pressure drop.

[1]  Moo Hwan Kim,et al.  An experimental study of condensation heat transfer inside a mini-channel with a new measurement technique , 2004 .

[2]  Geoffrey F. Hewitt,et al.  Two-Phase Flow and Heat Transfer , 2019, Fundamentals of Multiphase Heat Transfer and Flow.

[3]  Srinivas Garimella,et al.  Condensation Pressure Drop in Circular Microchannels , 2005 .

[4]  C. J. Baroczy,et al.  CORRELATION OF LIQUID FRACTION IN TWO-PHASE FLOW WITH APPLICATION TO LIQUID METALS , 1963 .

[5]  S. Garimella,et al.  Measurement and Modeling of Condensation Heat Transfer Coefficients in Circular Microchannels , 2006 .

[6]  John R. Thome,et al.  Condensation in Plain Horizontal Tubes: Recent Advances in Modeling of Heat Transfer to Pure Fluids and Mixtures , 2005 .

[7]  R. Webb,et al.  Friction pressure drop of R-12 in small hydraulic diameter extruded aluminum tubes with and without micro-fins , 1996 .

[8]  R. Lockhart.  Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes , 1949 .

[9]  M. Shah.  A general correlation for heat transfer during film condensation inside pipes , 1979 .

[10]  D. Kenning.  Liquid—vapor phase-change phenomena , 1993 .

[11]  Ralph L. Webb,et al.  A New Equivalent Reynolds Number Model for Condensation in Smooth Tubes , 1998 .

[12]  Anthony M. Jacobi,et al.  AN ASSESSMENT OF THE STATE OF THE ART, AND POTENTIAL DESIGN IMPROVEMENTS, FOR FLAT-TUBE HEAT EXCHANGERS IN AIR CONDITIONING AND REFRIGERATION APPLICATIONS - PHASE I , 2001 .

[13]  R. Webb,et al.  Condensation of R-12 in small hydraulic diameter extruded aluminum tubes with and without micro-fins , 1996 .

[14]  V. Gnielinski.  New equations for heat and mass transfer in turbulent pipe and channel flow , 1976 .

[15]  S. J. Kline,et al.  Describing Uncertainties in Single-Sample Experiments , 1953 .

[16]  R. Pease,et al.  High-performance heat sinking for VLSI , 1981, IEEE Electron Device Letters.

[17]  Srinivas Garimella,et al.  An Expermentally Validated Model for Two-Phase Pressure Drop in the Intermittent Flow Regime for Noncircular Microchannels , 2002 .

[18]  David F. Fletcher,et al.  Local condensation heat transfer rates in fine passages , 2003 .

[19]  Srinivas Garimella,et al.  Two-phase flow regimes in round, square and rectangular tubes during condensation of refrigerant R134a , 2003 .

[20]  J. Thome,et al.  Condensation in horizontal tubes, part 2: new heat transfer model based on flow regimes , 2003 .

[21]  Moo Hwan Kim,et al.  An Experimental Study of Flow Condensation Heat Transfer Inside Circular and Rectangular Mini-Channels , 2005 .

[22]  B. S. Petukhov.  Heat Transfer and Friction in Turbulent Pipe Flow with Variable Physical Properties , 1970 .

[23]  Srinivas Garimella,et al.  Characterization of two-phase flow patterns in small diameter round and rectangular tubes , 1999 .

[24]  L. Friedel.  Improved Friction Pressure Drop Correlation for Horizontal and Vertical Two-Phase Pipe Flow , 1979 .

[25]  J. Chato,et al.  Condensation in Smooth Horizontal Tubes , 1998 .

[26]  W. Wang,et al.  A condensation heat transfer correlation for millimeter-scale tubing with flow regime transition , 2002 .

[27]  H. Müller-Steinhagen,et al.  A simple friction pressure drop correlation for two-phase flow in pipes , 1986 .

[28]  J. Thome,et al.  Two-Phase Flow Pattern Map for Evaporation in Horizontal Tubes: Latest Version , 2003 .