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Publication details

Document type
Journal articles

Document subtype
Full paper

Title
Dielectric constant and dipole moment of hydrofluorocarbon refrigerant mixtures R404A, R407C, and R507

Participants in the publication
Filipe de Brito (Author)
INSTITUTO SUPERIOR TÉCNICO
 Anelia Gurova (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
 Carlos Nieto de Castro (Author)
Dep. Química e Bioquímica
 CQE
 Umesh Mardolcar (Author)
INSTITUTO SUPERIOR TÉCNICO
Summary
Reliable dielectric property information about three HFC mixtures currently regarded as replacements for R22 and R502 is given. The static dielectric constants of the ternary systems HFC125/143a/134a (R404A), HFC32/125/134a (R407C), and of the binary system HFC125/143a (R507) in the liquid phase were measured by the direct capacitance method at temperatures from 217 to 303 K and under pressures up to 16 MPa. The uncertainty of the measurements is estimated to be within 0.1% and the repeatability 0.01%. A complete set of tables is given of experimental data as a function of temperature, pressure, and density, which covers dielectric property needs for most engineering applications. The data obtained were correlated as a function of density and temperature by polynomial equations. In order to study the dependence of dielectric constant on density and temperature on a molecular basis, the theory developed by Vedam and Chen and adapted by Diguet was applied to analyse the data. Estimates for the dipole moments of the mixtures based on dielectric constant measurements are given. The Kirkwood theory was used to obtain the values of apparent dipole moments of R404A, R407C, and R507 in the liquid phase.

Date of Publication
2000

Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
High Temperatures-High Pressures

Publication Identifiers

Publisher
Old City Publishing, Inc

Volume
32
Number
6

Number of pages
21
Starting page
631
Last page
651

Document Identifiers
DOI - https://doi.org/10.1068/htwu504
URL - http://dx.doi.org/10.1068/htwu504

Keywords
static dielectric constant R404A R407C R507 refrigerant mixtures dipole moments of Vedam equation Kirkwood theory high pressure

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APA
Filipe de Brito, Anelia Gurova, Carlos Nieto de Castro, Umesh Mardolcar, (2000). Dielectric constant and dipole moment of hydrofluorocarbon refrigerant mixtures R404A, R407C, and R507. High Temperatures-High Pressures, 32, 631-651. http://dx.doi.org/10.1068/htwu504

IEEE
Filipe de Brito, Anelia Gurova, Carlos Nieto de Castro, Umesh Mardolcar, "Dielectric constant and dipole moment of hydrofluorocarbon refrigerant mixtures R404A, R407C, and R507" in High Temperatures-High Pressures, vol. 32, pp. 631-651, 2000. 10.1068/htwu504

BIBTEX
@article{51098, author = {Filipe de Brito and Anelia Gurova and Carlos Nieto de Castro and Umesh Mardolcar}, title = {Dielectric constant and dipole moment of hydrofluorocarbon refrigerant mixtures R404A, R407C, and R507}, journal = {High Temperatures-High Pressures}, year = 2000, pages = {631-651}, volume = 32 }