Measurements of the Isobaric Specific Heat Capacity for 1,1,1-Trifluoroethane (R143a), Pentafluoroethane (R125), and Difluoromethane (R32) in the Liquid Phase
Measurements of the isobaric specific heat capacity for the hydrocarbons 1,1,1-trifluoroethane (R143a), pentafluoroethane (R125), and difluoromethane (R32) were carried out in the liquid phase at a pressure of 5 MPa by using a batch type calorimeter equipped with a metal bellows. Ten data points of the isobaric specific heat capacity for R143a, 11 data points for R125, and seven data points for R32 were obtained in the temperature range from (310 to 350) K and at a pressure of 5 MPa. The experimental uncertainties are estimated to be 5 mK for temperature, 3 kPa for pressure, and 5.2 % for isobaric specific heat capacity. The present results were compared with the literature data and the values calculated from the equation of state. The correlations of the isobaric specific heat capacity were formulated as a function of temperature at a pressure of 5 MPa. Maximum deviations of the present results from correlations were 1.4 % for R143a, 1.5 % for R125, and 0.9 % for R32, respectively.
Compounds
#
Formula
Name
1
C2H3F3
1,1,1-trifluoroethane
2
C2HF5
pentafluoroethane
3
CH2F2
difluoromethane
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Molar heat capacity at constant pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
thermal relaxation
10
POMD
2
Molar heat capacity at constant pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
thermal relaxation
11
POMD
3
Molar heat capacity at constant pressure, J/K/mol ; Liquid