Mesures et modélisation des propriétés thermodynamiques du CO2 + difluorométhane (R32): masse volumique, capacité calorifique et équilibre vapeur-liquide

Translated title of the contribution: Thermodynamic property measurements and modelling of CO2 + difluoromethane (R32): Density, heat capacity, and vapour-liquid equilibrium

Xiong Xiao, Liam D. Tenardi, Mirhadi S. Sadaghiani, Ehsan Sadeghi Pouya, Xiaoxian Yang, Saif Al Ghafri, Arman Siahvashi, Tomoya Tsuji, Atsuhiro Yukumoto, Yoshio Seiki, Paul L. Stanwix, Eric F. May

Research output: Contribution to journalArticlepeer-review

2 Citations (Web of Science)

Abstract

Accurate thermodynamic property data and models are demanded to reduce the design margins of industrial processes based on these fluids. In this work, measurements of density (ρ), heat capacity (cp), and vapour-liquid equilibrium (VLE) for CO2 + difluoromethane (R32) have been performed by the vibrating tube densimeter and the magnetic suspension balance densimeter, the visual cell and gas chromatograph, and the differential scanning calorimeter, respectively. Experiments were conducted over the temperatures ranging from (208.3 to 334.3) K and pressures reaching 10.04 MPa at CO2 concentrations of 0.7, 0.8 and 0.9. The measured data, together with the results reported in literature where applicable, were subsequently applied to regress the binary interaction parameters utilised in the mixture functions of Helmholtz energy model from REFPROP 10 software package. Noticeable improvements have been achieved for the model's ability to represent thermodynamic property data. The most significant achievement exists in density description: compared with the default parameters, the root-mean-square (RMS) deviation has been decreased by half.

Translated title of the contributionThermodynamic property measurements and modelling of CO2 + difluoromethane (R32): Density, heat capacity, and vapour-liquid equilibrium
Original languageFrench
Pages (from-to)260-273
Number of pages14
JournalInternational Journal of Refrigeration
Volume149
DOIs
Publication statusPublished - May 2023

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