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  • Digitale Medien  (3)
  • transient hot-wire method  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Liquid Thermal Conductivity of Ternary Mixtures of Difluoromethane (R32), Pentafluoroethane (R125), and 1,1,1,2-Tetrafluoroethane (R134a)1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 319-328 
    Details
    ISSN: 1572-9567
    Schlagwort(e): correlation ; R125 ; R134a ; R32 ; refrigerant ; ternary mixture ; thermal conductivity ; transient hot-wire method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The thermal conductivities of ternary refrigerant mixtures of difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) in the liquid phase have been measured by the transient hot-wire method with one bare platinum wire. The experiments were performed in the temperature range of 233 to 323 K and in the pressure range of 2 to 20 MPa at various compositions. The measured data are correlated as a function of temperature, pressure, and composition. From the correlation, we can calculate the thermal conductivity of pure refrigerants and their binary or ternary refrigerant mixtures. The uncertainty of the measurements is estimated to be ±2%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006619209872
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  • 2
    Digitale Medien
    Digitale Medien
    The thermal conductivity of R22, R142b, R152a, and their mixtures in the liquid state (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 937-950 
    Details
    ISSN: 1572-9567
    Schlagwort(e): mixtures ; R142b ; R152a ; refrigerants ; thermal conductivity ; transient hot-wire method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An experimental apparatus for measuring the thermal conductivity of liquids by the transient hot-wire method was constructed and tested with toluene as a standard liquid. Measurements were performed on R22, R142b, and R152a. The thermal conductivities of mixtures of R142b and R152a with R22 were also measured by varying the weight fraction of R22. Experiments were performed in the range from −50 to 50°C and from 2 to 20 MPa and the measured data are analyzed to obtain a correlation in terms of temperature, pressure, and composition of the mixture. While the thermal conductivity of R22 + R152a mixtures varies monotonously with composition, that of R22 + R142b mixtures turned out to go through an extremum value. The accuracy of our measurements is estimated to be within 2%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00502116
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  • 3
    Digitale Medien
    Digitale Medien
    Liquid Thermal Conductivity of Binary Mixtures of Pentafluoroethane (R125) and 1,1,1,2-Tetrafluoroethane (R134a) (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 55-62 
    Details
    ISSN: 1572-9567
    Schlagwort(e): mixture ; R125 ; R134a ; R125+R134a ; refrigerant ; thermal conductivity ; transient hot-wire method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Thermal conductivities of zeotropic mixtures of R125 (CF3CHF2) and R134a (CF3CH2F) in the liquid phase are reported. Thermal conductivities have been measured by a transient hot-wire method with one bare platinum wire. Measurements have been carried out in the temperature range of 233 to 323 K and in the pressure range of 2 to 20 MPa. The dependence of thermal conductivity on temperature, pressure, and composition of the binary mixture is presented. Measured thermal conductivity data are correlated as a function of temperature, pressure, and overall composition of the mixture. The uncertainty of our measurements was estimated to be better than 2%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021469928377
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