Description of the real gas isentropic changes for an ammonia-water vapor mixture

Kouremenos, DA; Kakatsios, XK; Floratos, OE

dc.contributor.author	Kouremenos, DA	en
dc.contributor.author	Kakatsios, XK	en
dc.contributor.author	Floratos, OE	en
dc.date.accessioned	2014-03-01T01:11:52Z
dc.date.available	2014-03-01T01:11:52Z
dc.date.issued	1996	en
dc.identifier.issn	0001-5970	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11835
dc.subject	Binary Mixture	en
dc.subject	Heat Pump	en
dc.subject	Water Vapor	en
dc.subject.classification	Mechanics	en
dc.subject.other	Ammonia	en
dc.subject.other	Computer software	en
dc.subject.other	Entropy	en
dc.subject.other	Equations of state	en
dc.subject.other	Gases	en
dc.subject.other	Gibbs free energy	en
dc.subject.other	Mixtures	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Pressure effects	en
dc.subject.other	Thermal effects	en
dc.subject.other	Thermal expansion	en
dc.subject.other	Vapors	en
dc.subject.other	Ammonia water vapor mixture	en
dc.subject.other	Computer program ISENEXPR	en
dc.subject.other	Isentropic expansion	en
dc.subject.other	Thermodynamic changes	en
dc.subject.other	Thermodynamic relation	en
dc.subject.other	Thermodynamics	en
dc.title	Description of the real gas isentropic changes for an ammonia-water vapor mixture	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF01171420	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF01171420	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The NH3-H2O binary mixture is used extensively in industrial refrigeration or heat-pump applications while it is a candidate for future units working with resorption-compression [1]. In this paper, the thermodynamic changes of an ammonia-water mixture in the vapor phase, along an isentropic expansion, have been calculated numerically for a starting point with a temperature of 800 degrees C and initial pressures of 20, 30, 40, and 50 bar. For this purpose, a special computer program, ISENEXPR, has been developed. The thermodynamic relations used were obtained in terms of the Gibbs free energy equation for the gas phase of pure components [1], [3], [6] and the entropy was held constant with an accuracy better than 0.000001 kJ/kgK. The runs performed for isentropic expansions showed a dependence of the isentropic on the both exponents initial pressure and NH3 mass fraction xi, while the other properties depend on varying degrees upon xi. Results are given in the form of diagrams, describing the isentropic change of the NH3-H2O gas phase mixture.	en
heal.publisher	SPRINGER-VERLAG WIEN	en
heal.journalName	Acta Mechanica	en
dc.identifier.doi	10.1007/BF01171420	en
dc.identifier.isi	ISI:A1996UV15500005	en
dc.identifier.volume	116	en
dc.identifier.issue	1-4	en
dc.identifier.spage	61	en
dc.identifier.epage	73	en