R1132a

References

Equation of State

Ryo Akasaka, Robert E. Low, and Eric W. Lemmon. A Fundamental Equation of State for 1,1-Difluoroethene (R-1132a). International Journal of Thermophysics, 47:128, 2026. doi:10.1007/s10765-026-03794-8.

Ideal gas specific heat

Ryo Akasaka, Robert E. Low, and Eric W. Lemmon. A Fundamental Equation of State for 1,1-Difluoroethene (R-1132a). International Journal of Thermophysics, 47:128, 2026. doi:10.1007/s10765-026-03794-8.

Thermal Conductivity

Marcia L. Huber. Models for the Viscosity, Thermal Conductivity, and Surface Tension of Selected Pure Fluids as Implemented in REFPROP v10.0. NIST Interagency/Internal Report (NISTIR) NISTIR 8209, National Institute of Standards and Technology, Gaithersburg, MD, 2018. doi:10.6028/NIST.IR.8209.

Viscosity

Marcia L. Huber. Models for the Viscosity, Thermal Conductivity, and Surface Tension of Selected Pure Fluids as Implemented in REFPROP v10.0. NIST Interagency/Internal Report (NISTIR) NISTIR 8209, National Institute of Standards and Technology, Gaithersburg, MD, 2018. doi:10.6028/NIST.IR.8209.

Surface Tension

Ryo Akasaka, Robert E. Low, and Eric W. Lemmon. A Fundamental Equation of State for 1,1-Difluoroethene (R-1132a). International Journal of Thermophysics, 47:128, 2026. doi:10.1007/s10765-026-03794-8.

Aliases

R1132A, R-1132a, R-1132A, HFO-1132a, VinylideneFluoride, 1,1-difluoroethene

Molecular Structure

R1132a — 3D conformer (interactive: click and drag to rotate)

Fluid Information

Parameter, Value
General
Molar mass [kg/mol]	0.0640340864
CAS number	75-38-7
ASHRAE class	A2
Formula	CH2=CF2
Acentric factor	0.17702441908795863
InChI	InChI=1S/C2H2F2/c1-2(3)4/h1H2
InChIKey	BQCIDUSAKPWEOX-UHFFFAOYSA-N
SMILES	C=C(F)F
ChemSpider ID	-1
Limits
Maximum temperature [K]	400.0
Maximum pressure [Pa]	30000000.0
Triple point
Triple point temperature [K]	111.0
Triple point pressure [Pa]	33.21538730795906
Critical point
Critical point temperature [K]	302.61999999913303
Critical point density [kg/m3]	416.86190247279006
Critical point density [mol/m3]	6510.000000137272
Critical point pressure [Pa]	4460494.407915587

REFPROP Validation Data

Note

This figure compares the results generated from CoolProp and those generated from REFPROP. They are all results obtained in the form \(Y(T,\rho)\), where \(Y\) is the parameter of interest and which for all EOS is a direct evaluation of the EOS

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.

Consistency Plots

The following figure shows all the flash routines that are available for this fluid. A red + is a failure of the flash routine, a black dot is a success. Hopefully you will only see black dots. The red curve is the maximum temperature curve, and the blue curve is the melting line if one is available for the fluid.

In this figure, we start off with a state point given by T,P and then we calculate each of the other possible output pairs in turn, and then try to re-calculate T,P from the new input pair. If we don’t arrive back at the original T,P values, there is a problem in the flash routine in CoolProp. For more information on how these figures were generated, see CoolProp.Plots.ConsistencyPlots

Note

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.

Flash consistency (HEOS): no failures.

Superancillary Plots

The following figure shows the accuracy of the superancillary functions relative to extended precision calculations carried out in C++ with the teqp library. The results of the iterative calculations with REFPROP and CoolProp are also shown.

Note

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.