Thermodynamic Model for the Ammonia-Water System

Kaj Thomsen, Peter Rasmussen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The ammonia-water system is described by the Extended UNIQUAC model, which is an electrolyte model, formed by combining the original UNIQUAC model, the Debye-Hückel law and the Soave-Redlich-Kwong equation of state. The model is limited to temperatures below the critical temperature of ammonia. Vapor-liquid equilibria are described within the experimental accuracy. The accuracy of enthalpy calculations is better than ±100 J mol-1, and heat capacity calculations deviate less than ±1% from experimental data. The accurate description of the thermal properties is achieved by taking speciation equilibria into account. Model parameters valid in the temperature range 0 - 130°C are given
Original languageEnglish
Title of host publicationHydrothermal Systems: Physics and Chemistry Meeting the Needs of Industry
Place of PublicationOttawa
PublisherNRC Press
Publication date2000
Pages118-125
Publication statusPublished - 2000
Event13th International Conference on the Properties of Water and Steam - Toronto
Duration: 1 Jan 1999 → …

Conference

Conference13th International Conference on the Properties of Water and Steam
CityToronto
Period01/01/1999 → …

Cite this

Thomsen, K., & Rasmussen, P. (2000). Thermodynamic Model for the Ammonia-Water System. In Hydrothermal Systems: Physics and Chemistry Meeting the Needs of Industry (pp. 118-125). NRC Press.