Liquid-Phase Speed of Sound and Vapor-Phase Density of Difluoromethane
- 23 September 2022
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Chemical & Engineering Data
- Vol. 67 (10), 3022-3032
- https://doi.org/10.1021/acs.jced.2c00441
Abstract
Difluoromethane (HFC-32, DFM), with a global warming potential (GWP) of 677, is of interest as a pure refrigerant and as a component in low-GWP refrigerant mixtures. Additionally, difluoromethane has recently been identified as a safe, liquefied-gas electrolyte material in batteries. Using state-of-the-art instruments for measurements, this paper presents new liquid-phase speed of sound and vapor-phase density data for. Two hundred and nine liquid-phase speed of sound values were measured using a dual-path pulse-echo instrument at temperatures from 230 to 345 K and pressures from 2.1 to 70 MPa. Accounting for all sources of uncertainty, the relative expanded combined uncertainty (k = 2) in the speed of sound ranged from 0.035 to 0.17%. One hundred and thirty-eight vapor-phase density values were measured using a two-sinker densimeter at temperatures from 240 to 340 K and pressures from 0.1 to 1.61 MPa with an uncertainty of 0.011 to 0.12%. These experimental data will be valuable in the ongoing development of a new fundamental thermodynamic equation of state for.Keywords
This publication has 33 references indexed in Scilit:
- Thermodynamic Properties of Propane. III. A Reference Equation of State for Temperatures from the Melting Line to 650 K and Pressures up to 1000 MPaJournal of Chemical & Engineering Data, 2009
- A liquid density standard over wide ranges of temperature and pressure based on tolueneJournal of Research of the National Institute of Standards and Technology, 2008
- Apparatus for wide-ranging, high-accuracy fluid (p,ρ,T) measurements based on a compact two-sinker densimeterThe Journal of Chemical Thermodynamics, 2007
- Densimetry for primary temperature metrology and a method for thein situdetermination of densimeter sinker volumesMeasurement Science and Technology, 2006
- Densimeters for very accurate density measurements of fluids over large ranges of temperature, pressure, and densityMetrologia, 2004
- The speed of sound and isentropic compressibility of liquid difluoromethane (HFC32) fromT=(248 to 343) K and pressures up to 65 MPaThe Journal of Chemical Thermodynamics, 1999
- PVT properties, vapor pressures and critical parameters of HFC-32Fluid Phase Equilibria, 1995
- PVT Property Measurements for DifluoromethaneJournal of Chemical & Engineering Data, 1994
- Thermodynamic Properties of DifluoromethaneJournal of Chemical & Engineering Data, 1994
- Pressure-volume-temperature behavior of difluoromethaneJournal of Chemical & Engineering Data, 1968