Isochoric p-{rho}-T measurements on 1,1-difluoroethane (R152a) from 158 to 400 K and 1,1,1-trifluoroethane (R143a) from 166 to 400 K at pressures to 35 MPa

Journal Article · Tue Sep 01 04:00:00 EDT 1998 · International Journal of Thermophysics

DOI:https://doi.org/10.1023/A:1021931518519· OSTI ID:305481

Magee, J W ^[1]

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1. National Inst. of Standards and Technology, Boulder, CO (United States)

The p-{rho}-T relationships have been measured for 1,1-difluoroethane (R152a) and 1,1,1-trifluoroethane (R143a) by an isochoric method with gravimetric determinations of the amount of substance. Temperatures ranged from 158 to 400K for R152a and from 166 to 400 K for R143a, while pressures were up to 35 MPa. Measurements were conducted on compressed liquid samples. Determinations of saturated liquid densities were made by extrapolating each isochore to the vapor pressure, and determining the temperature and density at the intersection. Published p-{rho}-T data are in good agreement with this study. For the p-{rho}-T apparatus, the uncertainty of the temperature is {+-}0.03 K, and for pressure it is {+-}0.01% at p > 3 MPa and {+-}0.05% at p > 3 MPa and {+-}0.05% at p < 3MPa. The principal source of uncertainty is the cell volume ({approximately}28.5 cm{sup 3}), which has a standard uncertainty of {+-}0.003 cm{sup 3}. When all components of experimental uncertainty are considered, the expanded relative uncertainty (with a coverage factor k = 2 and thus a two-standard deviation estimate) of the density measurement is estimated to be {+-}0.05%.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-91CE23810
• OSTI ID: 305481
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 5 Vol. 19; ISSN 0195-928X; ISSN IJTHDY
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
DATA COVARIANCES
DENSITY
FLUORINATED ALIPHATIC HYDROCARBONS
HIGH PRESSURE
MATERIAL SUBSTITUTION
REFRIGERANTS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K