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The state-of-the-art of computer libraries in the field of thermodynamic properties are based on the Helmholtz energy equation. Unfortunately, the use of high-level programming languages and its complex implementation often exceeds the memory limit of most microcontrollers. In this context, after examination of the behavior of five variants of the Peng-Robinson equation, a set of simple equations for the saturation properties of common refrigerants that exceeded the precision of the former ones were developed. The proposed correlations are directly programmable in C language, facilitating the implementation in microcontrollers. Several prototype equations were fitted to the thermodynamic data in the reference RefProp library for a few thermodynamics properties by means of a non-linear multiparametric least-squares fitting procedure. Finally, a discussion of the best function for each property, as well as the average and local coefficients and uncertainties have been reported for several common refrigerants.

maskana

Aplicación de ecuaciones de estado cúbicas y desarrollo de correlaciones numéricas para el cálculo de propiedades termodinámicas en saturación de refrigerantes para su uso en microcontroladores