Loading...
Publication
Acoustic determination of thermophysical properties and critical parameters for R410A and critical line of x CO2+(1− x) R410A
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 145.19 KB | Adobe PDF |
Advisor(s)
Abstract(s)
The thermophysical properties and critical parameters for the alternative refrigerant R410A (a near azeotropic
refrigerant mixture containing difluoromethane (R32) and pentafluoroethane (R125) (50 wt % of each)) were
investigated using two different acoustic techniques. The critical behavior of the system xCO2 + (1 - x)R410A
was also investigated. Experimental data of speed of sound in liquid R410A from (253 to 338) K and pressures
up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties were calculated,
combining our experimental data with density and isobaric heat capacity values published by other authors.
Measurements of the critical temperature Tc and pressure pc on (R410A) and mixtures of xCO2 + (1 - x)R410A
were performed using another simple ultrasonic time-delay technique. The binary critical line was determined
over the whole composition range, showing that this system deviates only slightly from ideality since the critical
line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules
was used to correlate the binary experimental data.
Description
Keywords
R410A Critical Line of xCO2 + (1 - x)R410A Acoustic determination Thermophysical properties . Faculdade de Ciências Exatas e da Engenharia
Citation
Ribeiro, N., Costa, T., Aguiar-Ricardo, A., Esperança, J. M., Pires, P. F., & Guedes, H. J. (2006). Acoustic determination of thermophysical properties and critical parameters for R410A and critical line of x CO2+(1− x) R410A. Journal of Chemical & Engineering Data, 51(5), 1906-1914. https://doi.org/10.1021/je060243s
Publisher
American Chemical Society