An improved Helmholtz energy model for non-polar fluids and their mixtures. Part 2: Application to mixtures of non-polar fluids

An improved Helmholtz energy model for non-polar fluids and their mixtures. Part 3: Application to natural gases and related systems

“…Indeed, in the work of [1] coefficients were reported for ethylene, benzene and toluene, which are fluids that Kunz et al [4] reported to be further incorporated into the GERG-2004 equation. On the other hand, and more importantly, it was shown in [2] that the mixture model meets the requirements on accuracy of the current multi-fluid mixture models [9]. Therefore, those promising results support the hypothesis that the mixture model would meet the required accuracy for natural gases and related systems.…”

“…The results obtained with the mixture model of [2] allow formulating the hypothesis that the model could also perform satisfactorily if applied to natural gas systems. On the one hand, the mixture model could readily meet the above requirement on the extension to more fluids because of its formulation as an extended corresponding states (ECS) model.…”

“…This is the third publication in a series [1,2] that presented a Helmholtz energy model for the prediction of thermodynamic properties of non-polar fluids and their mixtures. The work presented in [1] presented the development of the Helmholtz energy model and its application to 18 non-polar fluids comprising light and medium hydrocarbons and inorganic compounds whereas the extension to binary, ternary and quaternary mixtures of those fluids was documented in [2].…”

“…The work presented in [1] presented the development of the Helmholtz energy model and its application to 18 non-polar fluids comprising light and medium hydrocarbons and inorganic compounds whereas the extension to binary, ternary and quaternary mixtures of those fluids was documented in [2]. The main objective of this work is to build on the satisfactory performance of the mixture model of [2] to apply and further adapt it to natural gases and related systems.…”

“…Then the rationale of this work is twofold: natural gas systems are fluids of considerable technological, economical and societal importance and this work offers the opportunity to validate the performance of the mixture model of [2] under highly demanding conditions. On the one hand, natural gas is a key energy commodity, providing about 21 percent of the world total primary energy supply [3] and is foreseen to maintain that important role well into the century mainly because current reserves are expected to last longer than those of petroleum and because the emission factor of natural gas, i.e.…”