Computer Subroutines for Rapid Calculation of the Liquid Entropies of Ammonia/NaSCN and Ammonia/LiNO3 Solutions

Authors : Njock PAUL JULBİN, Koumı Ngoh SİMON, Ndame Ngangue MAX KELLER, Sosso Mayı OLİVİER THİERRY, Nzengwa ROBERT

Pages : 77-87

Doi:10.5541/ijot.1034035

View : 10 | Download : 7

Publication Date : 2022-06-01

Article Type : Research Paper

Abstract :This paper proposes an alternative for the calculation of the liquid entropy of binary solutions is proposed in this paper in the form of correlation equations with higher computation speed. These correlation equations were obtained by using both the least squares method for the modelling of the reference liquid entropy and a classical matrix computer solving for modeling the liquid entropy. Goodness-of-fit parameters such as sum of squares of estimation errors insert ignore into journalissuearticles values(SSE);, Pearson`s factor insert ignore into journalissuearticles values(R-squared);, root mean square error insert ignore into journalissuearticles values(RMSE); and relative error insert ignore into journalissuearticles values(ε); were computed and the different results were compared with those of the digitized data. The suggested correlations showed good accuracy in estimating the liquid entropy of ammonia/NaSCN and ammonia/LiNO3 solutions, with an average SSE of 1.23.10^insert ignore into journalissuearticles values(-4);, R-squared of 0.99, RMSE of 2.90.10^insert ignore into journalissuearticles values(-3); and ε of 0.59 % for ammonia/LiNO3, and SSE of 1.57.10^insert ignore into journalissuearticles values(-4);, R-squared of 0.99, RMSE of 3.2.10^insert ignore into journalissuearticles values(-3); and ε of 0.83 % for ammonia/NaSCN. These correlations are for the temperature range from 0 to 100 °C, and are decision support tools for combined systems for waste heat recovering at very low temperature and in which the couples ammonia / NaSCN and ammonia / LiNO3 must be used.
Keywords : Entropy, Binary solutions, Correlation equations, Computer subroutines, Thermodynamic