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Kyaw Thu - One of the best experts on this subject based on the ideXlab platform.

Sebastiano Tomassetti - One of the best experts on this subject based on the ideXlab platform.

Xianyang Meng - One of the best experts on this subject based on the ideXlab platform.

  • Surface Tension and Liquid Viscosity of R32+R1234yf and R32+R1234ze
    Journal of Chemical & Engineering Data, 2016
    Co-Authors: Junwei Cui, Xianyang Meng
    Abstract:

    The surface tension and liquid viscosity of two binary refrigerant mixtures 1,1,1,2-tetrafluoroethane (R32) (1) + 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) (2) and R32 (1) + trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze) (2) have been measured from 293 K to the critical point by using the surface light scattering (SLS) method. The experimental data were correlated as a function of temperature and mole fraction of the pure components. For the surface tension of R32+R1234yf and R32+R1234ze, the average absolute deviations are 0.053 and 0.029 mN·m–1, respectively. As for the liquid viscosity, the relative percentage average absolute deviations are 0.86 and 1.01%, respectively.

  • surface tension and liquid viscosity of R32 r1234yf and R32 r1234ze
    Journal of Chemical & Engineering Data, 2016
    Co-Authors: Junwei Cui, Xianyang Meng
    Abstract:

    The surface tension and liquid viscosity of two binary refrigerant mixtures 1,1,1,2-tetrafluoroethane (R32) (1) + 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) (2) and R32 (1) + trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze) (2) have been measured from 293 K to the critical point by using the surface light scattering (SLS) method. The experimental data were correlated as a function of temperature and mole fraction of the pure components. For the surface tension of R32+R1234yf and R32+R1234ze, the average absolute deviations are 0.053 and 0.029 mN·m–1, respectively. As for the liquid viscosity, the relative percentage average absolute deviations are 0.86 and 1.01%, respectively.

Yukihiro Higashi - One of the best experts on this subject based on the ideXlab platform.

  • vapor liquid equilibrium property measurements for R32 r1234yf binary mixtures in low R32 concentration
    International Journal of Thermophysics, 2020
    Co-Authors: T Yamada, H Miyamoto, Naoya Sakoda, Yukihiro Higashi
    Abstract:

    This study obtained the precise measurements of the vapor–liquid equilibrium properties for R32/R1234yf binary mixtures, which are the key components for the next-generation refrigerant mixtures. To obtain the data more rapidly and precisely, two recirculation-type vapor–liquid equilibrium property measurement apparatuses installed in different universities are used. One apparatus, which was used to measure data in high temperature region, is installed at Toyama Prefectural University, and the other apparatus, which was for low temperatures, is installed at Kyushu University. To achieve the low GWP values less than 150 (European F gas regulation value), the composition of R32 (difluoromethane; CH2F2, GWP = 677) should be less than 22 % in mass fraction (38 % in mole fraction). Therefore, we tried to obtain precisely the data of lower R32 composition less than 0.38 mol fraction. The present data comparatively agreed with the only one set of reliable data by Hu in lower R32 compositions, from which we conclude that recent equation of state for R32/R1234yf, which is widely used recently all over the world, has systematic deviations less than 3 % in the bubble point pressures. Moreover, based on the present data and reliable literature data, the binary interaction parameter, kij, of the modified Peng-Robinson equation of state was regressed. As the result, we succeeded to reproduce the present bubble point and dew point pressure data with deviations smaller than 3 % as mentioned above for mixtures with low R32 concentrations.

  • two phase and vapor phase thermophysical property pvtz measurements of the difluoromethane trans 1 3 3 3 tetrafluoroprop 1 ene binary system
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Sebastiano Tomassetti, G. Di Nicola, Uthpala A Perera, Mariano Pierantozzi, Yukihiro Higashi, Kyaw Thu
    Abstract:

    In this paper, 182 pvTz data (28 data in the two-phase region and 154 data in the superheated vapor region) of mixtures containing difluoromethane (R32) and trans-1,3,3,3-tetrafluoroprop-1-ene (R12...

  • Two-Phase and Vapor-Phase Thermophysical Property (pvTz) Measurements of the Difluoromethane + trans-1,3,3,3-Tetrafluoroprop-1-ene Binary System
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Sebastiano Tomassetti, G. Di Nicola, Uthpala A Perera, Mariano Pierantozzi, Yukihiro Higashi, Kyaw Thu
    Abstract:

    In this paper, 182 pvTz data (28 data in the two-phase region and 154 data in the superheated vapor region) of mixtures containing difluoromethane (R32) and trans-1,3,3,3-tetrafluoroprop-1-ene (R12...

Xiaosong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • experimental study of a novel double temperature chiller based on R32 r236fa
    Energy Conversion and Management, 2016
    Co-Authors: Jian Liu, Xiaosong Zhang, Xiaohui She, Liang Man, Wei Zhou
    Abstract:

    Abstract A novel double-temperature chiller with zeotropic mixture R32/R236fa is proposed in this paper, and chilled water with two different temperatures is produced, such as low temperature water ( T L , out  = 7 °C) and high temperature water ( T H , out  = 16 °C). An experimental setup is established to test the performance of the chiller. Effects of mass fraction of R32 in mixture R32/R236fa ( M (R32)), T L , out , T H , out and the heat transfer media flow rate on the performance of the chiller are studied. When T H , out is 18 °C, T L , out is 8 °C and M (R32) is 0.6, COP and refrigerating capacity are 4.11 and 4.42 kW, respectively. COP and refrigerating capacity increase as M (R32) increases. Exhausting pressure of the chiller increases with the increase of M (R32). As M (R32) is 0.6, exhausting pressure is about 1.95 MPa. Compression ratio decreases with the increase of M (R32). When M (R32) increases from 0.3 to 0.6, the compression ratio decreases from 3.0 to 2.9.

  • Experimental study of a novel double temperature chiller based on R32/R236fa
    Energy Conversion and Management, 2016
    Co-Authors: Jian Liu, Xiaosong Zhang, Xiaohui She, Liang Man, Wei Zhou
    Abstract:

    Abstract A novel double-temperature chiller with zeotropic mixture R32/R236fa is proposed in this paper, and chilled water with two different temperatures is produced, such as low temperature water ( T L , out  = 7 °C) and high temperature water ( T H , out  = 16 °C). An experimental setup is established to test the performance of the chiller. Effects of mass fraction of R32 in mixture R32/R236fa ( M (R32)), T L , out , T H , out and the heat transfer media flow rate on the performance of the chiller are studied. When T H , out is 18 °C, T L , out is 8 °C and M (R32) is 0.6, COP and refrigerating capacity are 4.11 and 4.42 kW, respectively. COP and refrigerating capacity increase as M (R32) increases. Exhausting pressure of the chiller increases with the increase of M (R32). As M (R32) is 0.6, exhausting pressure is about 1.95 MPa. Compression ratio decreases with the increase of M (R32). When M (R32) increases from 0.3 to 0.6, the compression ratio decreases from 3.0 to 2.9.

  • a proposed subcooling method for vapor compression refrigeration cycle based on expansion power recovery
    International Journal of Refrigeration-revue Internationale Du Froid, 2014
    Co-Authors: Xiaosong Zhang
    Abstract:

    Abstract This study proposes a new subcooling method for vapor compression refrigeration cycle based on expansion power recovery. In a main refrigeration cycle, expander output power is employed to drive a compressor of the auxiliary subcooling cycle, and refrigerant at the outlet of condenser is subcooled by the evaporative cooler, which makes the hybrid system get much higher COP. Various refrigerants, including R12, R134a, R22, R32, R404A, R41, R507A, R717, and R744, are considered. Thermodynamic analysis is made to discuss the effects of operation parameters (expander efficiency and inlet temperature of cooling water) on the system performance. Results show that the proposed hybrid vapor compression refrigeration system achieves much higher COP than the conventional vapor compression refrigeration system, conventional mechanical subcooling system and conventional expansion power recovery system, with maximum COP increments 67.76%, 19.27% and 17.73%, respectively when R744 works as the refrigerant in the main refrigeration cycle. It is most beneficial for R12 and R717 in the auxiliary subcooling cycle and R744, R404A and R507A in the main refrigeration cycle.

Related terms

  • vapor compression refrigerant cycle
  • vapor liquid equilibrium properties
  • vapor phase thermophysical properties
  • viscosity
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