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  • 1
    Electronic Resource
    Electronic Resource
    The thermal conductivity of CFC alternatives HFC-125 and HCFC-141b in the liquid phase (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 279-292 
    Details
    ISSN: 1572-9567
    Keywords: CFC-alternatives ; HCFC-141b ; HFC-125 ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The liquid thermal conductivities of the CFC alternatives, HFC-125, and HCFC-141b measured by a transient hot-wire apparatus with one bare platinum wire are reported in the temperature ranges from 193 to 333 K (HFC-125, CHF2, CF3) and from 193 to 393 K (HCFC-141b,CCI2F-CF3), in the pressure ranges from 2 to 30 MPa (HFC-125) and from 0.1 to 30 MPa (HCFC-141b), respectively. The results have been estimated to have an accurancy of ±0.5%. The liquid thermal conductives obtained have been correlated by a polynomial of temperature and pressure which can represent the experimental results within the standard deviations of 0.49% for HFC-125 and 0.46% for HCFC-141b, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443393
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of Ternary Refrigerant Mixtures of HFC-32/125/134a in the Liquid Phase (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1417-1424 
    Details
    ISSN: 1572-9567
    Keywords: HFC-32/125/134a ; refrigerant ; R-407C ; ternary mixture ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The liquid thermal conductivity of two ternary mixtures of HFC-32/125/134a (23.0/25.0/52.0 and 19.0/43.8/37.2 wt%) was measured using a transient hot-wire instrument in the temperature ranges from 193 to 293 K and from 213 to 293 K, respectively, and in the pressure range from 2 to 30 MPa. The thermal conductivity has an estimated uncertainty of ±0.7%. For engineering purposes, the thermal conductivity data were correlated using a polynomial in temperature and pressure for each mixture with a standard deviation of 0.6%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021484904269
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  • 3
    Electronic Resource
    Electronic Resource
    Prediction of the Thermal Conductivity and Viscosity of Binary and Ternary HFC Refrigerant Mixtures (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 23-34 
    Details
    ISSN: 1572-9567
    Keywords: HFC-32 ; HFC-125 ; HFC-134a ; hard-sphere theory ; mixture ; refrigerant ; thermal conductivity ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently developed scheme, based on considerations of hard-sphere theory, is used for the simultaneous prediction of the thermal conductivity and the viscosity of binary and ternary HFC refrigerant mixtures, consisting of HFC-32, HFC-125, and HFC-134a. In this prediction scheme, the hypothetical molecular parameters of HFC refrigerant mixtures were assumed to be the molar average of the pure component values. The close agreement between the predicted values and the experimental results of thermal conductivity and viscosity demonstrate the predictive power of this scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006696518938
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of Binary Refrigerant Mixtures of HFC-32/125 and HFC-32/134a in the Liquid Phase (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1403-1415 
    Details
    ISSN: 1572-9567
    Keywords: HFC-32/125 ; HFC-32/134a ; binary mixture ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The liquid thermal conductivity of mixtures of HFC-32/125 and HFC-32/134a was measured using the transient hot-wire apparatus in the temperature ranges from 213 to 293 K and from 193 to 313 K, respectively, in the pressure range from 2 to 30 MPa and with HFC-32 mass fractions of 0.249, 0.500, and 0.750 for each system. The uncertainty of the thermal conductivity was estimated to be ±0.7%. For practical applications, the thermal conductivity data for the two mixtures were represented by a polynomial in temperature, pressure, and mass fraction of HFC-32 with a standard deviation of 1.0%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021432920199
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of HFC-32, HFC-125, and HFC-134a in the Solid Phase (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 415-425 
    Details
    ISSN: 1572-9567
    Keywords: HFC-32 ; HFC-125 ; HFC-134a ; melting point ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivity of HFC-32, HFC-125, and HFC-134a were carried out for the first time in both solid and liquid phases at the saturation pressure at room temperature and in the temperature ranges from 120 to 263, from 140 to 213, and from 130 to 295 K, respectively. A transient hot-wire instrument using one bare platinum wire was employed for measurements, with an uncertainty of less than ±2%. The experimental results demonstrated that the thermal conductivity of HFC-32, HFC-125, and HFC-134a in the solid phase showed a positive temperature dependence. For HFC-32 and HFC-125, there were big jumps between the solid and the liquid thermal conductivity at the melting point. But for HFC-134a, the solid and liquid thermal conductivity at the melting point is almost-continuous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022509310134
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  • 6
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    Low-frequency oscillations in total ozone measurements (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Low frequency oscillations with periods of approximately one to two months are found in eight years of global grids of total ozone data from the Total Ozone Mapping Spectrometer (TOMS) satellite instrument. The low frequency oscillations corroborate earlier analyses based on four years of data. In addition, both annual and seasonal one-point correlation maps based on the 8-year TOMS data are presented. The results clearly show a standing dipole in ozone perturbations, oscillating with 35 to 50 day periods over the equatorial Indian Ocean-west Pacific region. This contrasts with the eastward moving dipole reported in other data sets. The standing ozone dipole appears to be a dynamical feature associated with vertical atmospheric motions. Consistent with prior analyses based on lower stratospheric temperature fields, large-scale standing patterns are also found in the extratropics of both hemispheres, correlated with ozone fluctuations over the equatorial west Pacific. In the Northern Hemisphere, a standing pattern is observed extending from the tropical Indian Ocean to the north Pacific, across North America, and down to the equatorial Atlantic Ocean region. This feature is most pronounced in the NH summer.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 13797-13
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Possible feedback path for low-frequency atmospheric oscillations (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Four years of satellite-derived microwave radiance data have been analyzed, providing evidence for the possiblity of a feedback route in the Southern Hemisphere. The present propagation path extends from the central equatorial Pacific across lower South America, heads equatorward after passing south of Africa, and finally reenters the equatorial Indian Ocean with correct phase to enhance the primary equatorial dipole structure. The Southern Hemisphere propagation path migrates northward in April-September and southward in October-March, and it may constitute a feedback mechanism which could stabilize the low frequency oscillations.
    Keywords: GEOPHYSICS
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 45; 1425-143
    Format: text
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    NASA TECHNICAL REPORTS
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