BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Dielectric Constant of the Nearly Azeotropic Mixture R410A

Participants in the publication
F. E. 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
The purpose of this paper is to present dielectric constant measurements of R410A, a chlorine-free refrigerant, which is a 50/50 (mass %) mixture of R32/125. The measurements on R410A were performed as a function of pressure and temperature ranging from 2 to 16 MPa and from 217 to 304 K, respectively, by using a direct capacitance method. The values of dielectric constant have an estimated repeatability of ±0.01% and an accuracy of ±0.1%. The data were correlated as a function of density and pressure. The theory developed by Vedam et al., and adapted by Diguet, and the Kirkwood modification of the Onsager equation for the variation of the modified molar polarization with temperature and density were applied to analyze the data and to obtain the dipole moment of R410A in the liquid state. This was found to be 3.31 Debye.


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:1006687630344
URL - http://dx.doi.org/10.1023/a:1006687630344

Keywords
azeotropic mixture density dielectric constant Kirkwood equation R410A high pressure relative permittivity Vedam equation

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