Properties heat capacity data bank

In this paper our efforts are directed towards the establishment of a heat capacity data bank which are detailed. Of necessity, the initial steps are directed towards the equilibrium properties. Extensions to include glass transitions,... 

The polymer heat capacity data bank is, as outlined in the Introduction, is only the first step towards the establishment of a comprehensive Thermal Properties Data Bank. Presently we are expanding our efforts to include glass transition temperatures, melting temperatures and heats of fusion. In the planning stage are specific volune, compressibility, and thermal conductivity data banks, as well as the expansion to non-equilibrium properties. 

Varna-Nair M and Wunderlich B, "Heat Capacity and other Thermodynamic Properties of Linear Macromolecules", X-Update of the ATHAS (i.e. Advanced Thermal Analysis) Data Bank, a computerized version of the data bank of heat capacities. 

Data banks for the pure species may be viewed as a collection of data records, each containing the constants and parameters for a single chemical [e.g., the critical properties Tc, Pc-, Vc), the normal boiling point vapor pressure coefficients, heat capacity... 

For solving the tasks mentioned above, reliable experimental pure component properties (vapor pressures, densities, heat capacities, transport properties, etc.) and mixture data (phase equilibria, and excess properties) for the system considered would be most desirable. Some decades ago, a time-consuming literature search was always necessary to obtain these data. In the meantime comprehensive factual data banks, for example, the Dortmund Data Bank (DDB), NIST data bank, DIPPR data bank, and so on, have been built up. These data banks contain a great part of the worldwide available experimental data. 

The Center for Energy Resources Engineering (CERE) of the Technical University of Denmark (DTU) is operating a data bank for electrolyte solutions [18]. It is a compilation of experimental data for (mainly) aqueous solutions of electrolytes and/or nonelectrolytes. The database is a mixture between a literature reference database and a numerical database. Currently references to more than 3,000 papers are stored in the database together with around 150,000 experimental data. The main properties are activity and osmotic coefficients, enthalpies, heat capacities, gas solubilities, and phase equihhria like VLE, LLE, and SLE. The access to the htera-ture reference database is free of charge. The numerical values must be ordered at CERE. 

The data bank on basic physical and chemical properties of individual substances stores the following data the name of the substance, molecular mass, the structural formula of the molecule and the number of carbon atoms, melting and boiling temperatures at atmospheric pressure, critical parameters, acentric factor and polarity, parameters of the Lennard-Jones and Stockmayer potentials, the coefficients of an equation for calculation of isobaric heat capacity in the ideal-gas state and some other properties. The content of the bank is enlarged continuously by input of information on new substances. 

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