Compressed liquid density and speed of sound measurements and correlation of the binary mixture carbon dioxide (CO2) + 1,1-difluoroethene (R1132a)} at temperatures from 220 K to 350 K

Published

January 22, 2025

Author(s)

Davide Menegazzo, Aaron Rowane, Giulia Lombardo, Sergio Bobbo, Laura Fedele, Mark McLinden

Abstract

The combination of carbon dioxide (CO2) and R1132a has been proposed as a viable substitute for R23 in low-temperature applications. This study provides new experimental data on the compressed-liquid density, vapor density, and compressed-liquid speed of sound for the CO2 + R1132a binary system. These measurements were obtained using a two-sinker densimeter and a pulse-echo-type instrument. The density measurements span a temperature range of 220 K to 350 K and pressures up to 30 MPa, while the speed of sound measurements cover temperatures from 230 K to 350 K and pressures up to 65 MPa. For both properties, two different mixture compositions were tested. Additionally, we present an Equation of State (EoS) correlation for the experimental data, derived from a Helmholtz free energy model, which demonstrates a good fit with the measurements. Due to the mixture's strong absorption of the sound pulse, the standard dual-path analysis could not be employed. Therefore, a method utilizing only the short-path signal was developed.

Citation

International Journal of Refrigeration

Volume

172

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.ijrefrig.2025.01.014

Local Download

Keywords

refrigerants, low-GWP, compressed-liquid density, experimental measurements, speed of sound

Citation

Menegazzo, D. , Rowane, A. , Lombardo, G. , Bobbo, S. , Fedele, L. and McLinden, M. (2025), Compressed liquid density and speed of sound measurements and correlation of the binary mixture {carbon dioxide (CO2) + 1,1-difluoroethene (R1132a)} at temperatures from 220 K to 350 K, International Journal of Refrigeration, [online], https://doi.org/10.1016/j.ijrefrig.2025.01.014, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958500 (Accessed October 24, 2025)