ABSTRACT

In this work, the measured excess molar enthalpies of absorption heat pump working pairs (refrigerant + absorbent), viz. water + mono-, di- and tri-ethylene glycol, water + glycerol, and ethanol + di- and tri-ethylene glycol mixtures are presented at 298.15K 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.

Compounds

#	Formula	Name
1	C2H6O	ethanol
2	C2H6O2	1,2-ethanediol
3	C4H10O3	diethylene glycol
4	C6H14O4	triethylene glycol
5	C3H8O3	glycerol
6	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	2 6	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 6; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	13
POMD	3 6	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 6; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	13
POMD	4 6	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 6; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	9
POMD	5 6	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 6; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	9
POMD	1 3	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	9
POMD	1 4	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Calvet calorimetry	9

Thermodynamics Research Center / ThermoML | Thermochimica Acta

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

Zehioua, R.[Raouf], Coquelet, C.[Christophe], Soo, C.-B.[Chien-Bin], Richon, D.[Dominique], Meniai, A. H.[Abdeslam Hassen]

ABSTRACT