A thermodynamic property model explicit in the Helmholtz energy is presented for the R-134a/245fa mixtures. A multi-fluid approximation based on pure-fluid Helmholtz energy equations of state forms the basis of the property model. The Helmholtz energy of the mixture is expressed as the sum of the ideal gas contribution, the compressibility contribution (real fluid contribution), and the contrib...

Topological indices are the real number of a molecular structure obtained via molecular graph G. Topological indices are used for QSPR, QSAR and structural design in chemistry, nanotechnology, and pharmacology. Moreover, physicochemical properties such as the boiling point, the enthalpy of vaporization, and stability can be estimated by QSAR/QSPR models. In this study, the QSPR (Quantitative St...

The influence of thermodynamics on the emerging transdisciplinary field of ̳ecological economics‘ is critically reviewed from an interdisciplinary perspective. It is viewed through the lens provided by the ̳bioeconomist‘ Nicholas Georgescu-Roegen (1906–1994) and his advocacy of ̳the Entropy Law‘ as a determinant of economic scarcity. It is argued that exergy is a more easily understood thermodyn...