: DDB-CPE

Excess heat capacities in most cases contribute only little to the heat capacity of a mixture but should nevertheless be considered if very precise results are required. In addition, the data bank also contains data for the total heat capacity of a mixture.

DDB-CPE is of great use for the regression of temperature dependent model parameters for g^E-models and equations of state as it supplies reliable information about the temperature dependence of the excess enthalpy.

Excess heat capacities therefore provide information about the second derivative of g^E and thus the activity coefficients with respect to
temperature.

The figure on the right shows the excess heat capacity for the well known system ethanol-water as function of liquid mole fraction for three different temperatures.

DDB-CPE contains 3,751 heat capacity of mixtures and excess heat capacity data sets (41,506 data points) from 436 references for 400 components and 1,150 different systems (1,078 binary, 70 ternary and 2 quaternary systems)(Version 2011).

Selected Scientific Papers