Thermodynamic Properties of Ammonia-Water mixture using Tilner-Roth and Friend EOS for GAMS

Abstract

Dynamic link library with functions for calculating the thermodynamic properties of an Ammonia-Water mixture in the equation-oriented optimization software GAMS (General Algebraic Modeling System). The library is based on the equation of state proposed by Tillner-Roth and Friend. The properties that can be calculated are the enthalpy, entropy, density and the fugacity of each component in the mixture. The first function corresponds to the equation of state and allows the density of the mixture to be calculated implicitly as a function of its pressure, temperature, and mole fraction of ammonia. The library was implemented in the C programming language and all its functions include their corresponding analytical gradient and Hessian matrix. It must be included using the $funcLibIn command (see GAMS help).