Electrical properties of CFC- and HCFC-substitutes

Measurement of electrical properties of refrigerants and refrigerant–oil mixtures

“…These refrigerants are the most popular candidates for use in electro-mobile air conditioning systems. The results of the permittivity measurement of R134a were in agreement with the results given in Barao et al (1995), Meurer et al (2001), Barao et al (1996) and Fellows et al (1991). Also the value of the permittivity of R152a is comparable to the results presented in Barao et al (1998) andFellows et al (1991) (Fig.…”

“…The analysis of the dielectric constant and the DC resistivity of refrigerants and refrigeranteoil mixtures in the relevant temperature interval between À30 C and þ90 C and at pressures up to 100 bar is quite challenging. Only a few research groups around the world have been working on this subject (Barao et al, 1995(Barao et al, , 1996(Barao et al, , 1998Baustian et al, 1986;Bö hmer and Loid, 1988;Fellows et al, 1991;Hwang et al, 2008;Meurer et al, 2001;Ribeiro & Nieto de Castro, 2009;Tanaka et al, 1999) mostly using pure substances, but no refrigeranteoil systems.…”

Liquid resistivity of pharmaceutical propellants using novel resistivity cell

“…The determination of resistivity allows for the evaluation and testing of the performance of these liquids in high-voltage applications, such as transformers, capacitors, cables, and high-voltage switchgear 6 . Similarly, the use of hermetic and semi-hermetic compressors in refrigeration has led to the need for verifying the dielectric properties of refrigerants employed in these systems and exploring alternative options that require high resistivity 7 . Consequently, there is a growing demand for conducting resistivity tests across various operating conditions.…”

“…They found the DC resistivity of R134a and R152a to be 10 8 Ωm and 10 7 Ωm, respectively. The resistivity of R134a was investigated by Meurer 7 , followed by Dschung 10 . The latter also measured data for the resistivity of R227ea.…”