The paper presents the results of experimental heat transfer and pressure drop during condensation of the single component refrigerant R134a and zeotropic mixtures R404A, R407C, and R410A in tube minichannels of internal diameter from the range 0.31-3.30 mm. The local values and the average of heat transfer coefficient and pressure drop in the whole range of the change in mass quality were measured. On the basis of the obtained test results there was illustrated the influence of the change of mass vapor quality, the mass flux density, and the inner diameter of channel on the studied parameters. These results were compared with the calculation results based on the relations postulated by other authors. The discrepancy range was ± 50%. On the basis of given test results own correlation was developed to calculate the heat transfer coefficient and pressure drop of tested refrigerants which presents the obtained results in a range of discrepancy of ±25%.
 Akasaka R., Tanaka K., Higashi Y.: Thermodynamic property modeling for 2,3,3,3-tetrafluoropropene (HFO-1234yf). Int. J. Refrig. 33(2010), 52-60.
 Akers W., Deans O.K., Crosser O.K.: Condensation heat transfer within horizontal tubes. X Chem. Eng. Prog. 54(1985), 89-90.
 Baroczy C.J.: Correlation of liquid fraction in two-phase flow with applications to liquid metals. Chem. Eng. Prog. Symp. 61(1965), 179-191.
 Bohdal T., Charun H., Sikora M.: Comparative investigations of the condensation of R134a and R404A refrigerants in pipe minichannels. Int. J. Heat Mass Trans. 54(2011), 9-10, 1963-1974.
 Bohdal T., Charun H., Sikora M.: Experimental thermal-hydraulic characyterstics of condensation of zeotropic mixtures in canventional channels and minichannels. Chłodnictwo 6(2013), 14-19 (in Polish).
 Bohdal T., Charun H., Sikora M.: Pressure drop during condensation of refrigerants in pipe minichannels. Arch. Thermodyn. 33(2012), 1, 87-106.
 Bonca Z., Burtymowicz D., Targański W., Hajduk T.: New refrigerants and heat carriers. Thermal, chemical and application properties . A handbook. IPPU MASTA, Gdańsk 2004 (in Polish).
 Cavallini A., Censi G., Del Col D., Doretti L., Longo G.A., Rossetto L.: Experimental investigation on condensation heat transfer and pressure drop of new HFC refrigerants (R134a, R125, R32, R410A, R236ea) in a horizontal smooth tube. Int. J. Refrig. 24(2001), 73-87.
 Cavallini, Cenesi G., Del Col D., Doretti L., Rossetto L.: Heat transfer coefficient HFC refrigerant turing condensation at high temperature inside a enhance tube. Proc. Int. Refrig. Conf. AT Purdue Univ., West Lafayette 2002.
 Cavallini, Censi G., Del Col D., doretti L., Longo G.A., Rossetto L.: Condensation of halogenated refrigerants inside smooth tubes. HVAC & Res.8(2002), 4, 429-451.
 Cavallini, Del Col D., Doretti L., Matkovic M., Rossetto L., Zilio C.: Two - phase frictional pressure gradient of R236ea, R134a and R410A inside multiport minichannels. Exp. Therm. Fluid Sci. 29(2005), 861-870.
 Charun H.: Experimental methods of heat transfer investigations during phase change of refrigerants in minichannels. Chłodnictwo 12(2012), 18-21 (in Polish).
 Charun H.: Thermal and flow characteristics of the condensation of R404A refrigerant in pipe minichannels. Int. J. Heat and Mass Trans. 55(2012), 2692-2701.
 Chen J.Y., Yang K.S., Chang Y.J., Wang C.C.: Two - phase pressure drop of air - water and R410A in small horizontal tubes. Int. J. Multiphase Flow 27(2001), 1293- 1299.
 Doerr T.M., Pate M.B.: In-tube condensation heat transfer of refrigerant mixtures. ASHRAE Trans. 100(1994), 547-557.
 Friedel L.: Improved friction pressure drop correlation for horizontal and vertical two-phase pipe flow. European Two-Phase Flow Group Meeting, Paper 2, Ispra 1987.
 Garimella s., Agarwal A., Killion J.D.: Condensation pressure drop in circular microchannels. Heat Transfer Eng. 26(2005), 1-8.
 Jin X., Zhang X.: A new evaluation method for zeotropic refrigerant mixtures based on the variance of the temperature difference between the refrigerant and heat transfer fluid. Energ. Convers. Manage. 52(2011), 243-249.
 Lie Y.M., Su F.Q., Lai R.I., Lin T.F.: Experimental study of evaporation pressure drop characteristics of refrigerants R134a and R407C in horizontal small tubes. Int. J. Heat Mass Trans. 51(2008), 294-301.
 Mikielewicz D., Andrzejczyk R., Jakubowska B., Mikielewicz J.: Comparative study of heat transfer and pressure drop during flow boiling and flow condensation in minichannels. Arch. Thermodyn. 35(2014), 3, 17-37.
 Mikielewicz D., Andrzejczyk R.: Comparative study of flow condensation in conventional and small diameter tubes. Arch. Thermodyn. 33(2012), 2, 67-83.
 Montreal Protocool on substences that deplete the ozone layer. Prepared in Montreal on 16 September 1987 r. Dz.U. [Journal of Laws] from 23 Dec. 1992.
 Rajan S.: Comparison of refrigerants R410A and R404A for use in low temperature applications: a computer model study. Ph.D. Thesiss, Mechanical Engineering in the Graduate College of the University of Illinois at Urbana-Champaign, 2011.
 Shah M.M.: A general correlation for heat transfer during film condensation inside pipes. Int. J. Heat . Mass Trans. 22(1979), 547-556.
 Son Ch.-H., Lee H.-S.: Condensation heat transfer characteristics of R-22, R-134a and R-410A in small diameter tubes. Heat Mass Transfer 45(2009), 1153-1166.
 Tang L.: Empirical study of new refrigerant flow condensation inside horizontal smooth and micro-fin tubes. University of Maryland k, PhD. thesis, College Par 1997.
 The National Archives. Regulation (EC) No 842/2006 of the European Parliament and of the Council of on certain fluorinated greenhouse gases.
 Thome J.R.: Condensation in plain horizontal tubes: Recent advances in modeling of the transfer to pure fluids and mixture. J. Braz. Soc. Mech. Sci. 27(2005), 23-30.
 Thome J.R., Hajal J.El., Cavallini A: Condensation in horizontal tubes, part 2: new heat transfer model based on flow regimes. Int. J. Heat Mass Trans. 46(2003), 3365-3387.
 Act on treatment of substances depleting the ozone layer. Dz.U. [Journal of Laws] No 52, item. 537 from 3 March 2001.
 Wang Ch.-Ch.: System performance of R-1234yf refrigerant in air-conditioning and heat pump system - An overview of current status. Appl. Therm. Eng. 73(2014), 1-9.
 Zhang M., Webb R.L.: Correlation of two-phase friction for refrigerants in small diameter tubes. Exp. Therm. Fluid Sci. 25(2001), 131-139.
 Zhao L., Gao P.: Evaluation of zeotropic refrigerants based on nonlinear relationship between temperature and enthalpy. Sci. China: Ser. E. Technol. Sci. 49(2006), 322-331.