BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Dielectric Properties of Liquid Pentafluoroethane (HFC-125)

Participants in the publication
L. M. Pereira (Author)
INSTITUTO SUPERIOR TÉCNICO
F. E. de Brito (Author)
INSTITUTO SUPERIOR TÉCNICO
A. N. Gurova (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
U. V. Mardolcar (Author)
INSTITUTO SUPERIOR TÉCNICO
C. A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE

Summary
This paper reports measurements of the static relative permittivity of HFC-125 in the liquid phase, performed by using the direct capacitance method at 10 kHz, for temperatures from 214 to 304 K and pressures up to 16 MPa. The repeatability of the measurements was found to be of the order of ±0.7×10−3and the uncertainty is estimated to be better than ±0.72×10−2. We provide a complete set of tables of experimental data as a function of temperature, pressure, and density, which cover the dielectric property needs for most engineering applications. The data obtained were used to establish dielectric equations of state as a function of density and temperature and as a function of pressure and temperature. To study the dependence of the relative permittivity on temperature, pressure and density, we have applied various molecular theories of polar liquids. The apparent dipole moment obtained was μ*=2.482 D.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
International Journal of Thermophysics

Publication Identifiers

Publisher
Springer Science and Business Media LLC



Document Identifiers
DOI - https://doi.org/10.1023/a:1010783101173
URL - http://dx.doi.org/10.1023/a:1010783101173

Keywords
dipole moment HFC-125 refrigerant pentafluoroethane Kirkwood equation relative permittivity Vedam equation

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