The dielectric constant of liquid HFC 134a and HCFC 142b
- Faculdade de Ciencis da Universidade de Lisboa (Portugal)
- Instituto Superior Tecnico, Lisboa Codex (Portugal)
This paper presents measurements of the dielectric constant of HFC 134a and HCFC 142b, as a function of pressure and temperature, in the temperature range from 200 to 300 K and pressures up to 20 MPa, using a direct capacitance method. The samples used had a stated purity of 99.8 and 99.9%, respectively. The values of the dielectric constant have a precision of 0.01% and an accuracy of 0.1%. The data obtained were correlated as a function of density and pressure. The theory developed by Vedam et al., based on the Eulerian strain, and the Kirkwood equation for the variation of modified molar polarization with temperature and density were applied to analyze the data and to obtain the dipole moment of both refrigerants in the liquid state.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 471823
- Journal Information:
- International Journal of Thermophysics, Vol. 17, Issue 3; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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