A computationally effective formulation of the thermodynamic properties of LiBr-H{sub}2O solutions from 273 to 500 K over full composition range

摘要

A set of computationally efficient formulations of thermodynamic properties of LiBr-H{sub}2O solutions at vapor-liquid equilibrium is presented in the form of explicit separate functions of temperature and mixture composition. The set includes pressure, density, isobaric heat capacity, enthalpy, and entropy. The description of these properties is valid from 273 K or from the crystallization line up to 500 K in temperatures and for mixture composition from 0 to 75 wt% of LiBr in the solution. The equations are based upon a body of experimental data that have been critically assessed. Gaps in the database are shown to give experimenters orientation for future research. The structure of the equations guarantees an explicit transition to the properties of pure water for lithium bromide concentration approaching zero. The uncertainties associated with correlation are estimated to be ±0.5% for density, ±2.1% for pressure and ±2% for isobaric heat capacity. The uncertainty in values of enthalpy is estimated to be ± 10 kJ kg{sup}(-1) and ±0.03kJ kg{sup}(-1) K{sup}(-1) for entropy. Values of the particular properties generated by the representative equations are provided to assist with the confirmation of computer implementation of the calculation procedure.