Experimental and predicted excess molar enthalpies of some working pairs for absorption cycles

Raouf Zehioua (1, 2) , Christophe Coquelet (3) , Chien-Bin Soo (1) , Dominique Richon (3) , Abdeslam-Hassen Meniai (2)

1 CEP - Centre Énergétique et Procédés
2 LIPE - Laboratoire de l'Ingénierie des Procédés de l'Environnement
3 CEP/Fontainebleau

in this work, the measured excess molar enthalpies of absorption heat pump working pairs (refrigerant + absorbent), viz. water + rnono-, di- and tri-ethylene glycol, water + glycerol, and ethanol + di- and tri-ethylene glycol mixtures are presented at 298.15 K and ambient pressure using a Setaram Calvet C80 calorimeter. The experimental results are represented and correlated by a Redlich-Kister type equation. Modeling of the excess enthalpies has been performed using the UNIFAC molecular group-contribution method, and UNIQUAC Gibbs energy model. In addition, the data and results are used to predict the Gibbs energy of all binary systems. This allows a preliminary evaluation of the suitability of the binary systems as heat pump working pairs. (C) 2009 Elsevier B.V. All rights reserved.

Mots clés: Excess enthalpies; C80 calorimeter; Redlich-Kister; Water; Ethanol; Glycol; Glycerol; UNIFAC; UNIQUAC; Absorption cycles

Domaines: Energétique; Génie des procédés

Raouf Zehioua, Christophe Coquelet, Chien-Bin Soo, Dominique Richon, Abdeslam-Hassen Meniai. Experimental and predicted excess molar enthalpies of some working pairs for absorption cycles. Thermochimica Acta, 2009, pp.72- 80. ⟨10.1016/j.tca.2009.06.004⟩. ⟨hal-00508606⟩