R-410A and R-404A real gas thermodynamic relations and their application for predicting exergy efficiency in vapor compression heat pumps

Stegou-Sagia, A; Papadaki, A; Loakim, V

dc.contributor.author	Stegou-Sagia, A	en
dc.contributor.author	Papadaki, A	en
dc.contributor.author	Loakim, V	en
dc.date.accessioned	2014-03-01T01:55:35Z
dc.date.available	2014-03-01T01:55:35Z
dc.date.issued	2006	en
dc.identifier.issn	0015-7899	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/27802
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Engineering, Mechanical	en
dc.title	R-410A and R-404A real gas thermodynamic relations and their application for predicting exergy efficiency in vapor compression heat pumps	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Enthalpy and entropy equations, as these resulted from the Martin-Hou Equation of State, are presented for the promising mixtures R-404A and R-410A that replace the HCFC-22 in refrigerator and heat pump systems. Based on these equations, a model was developed to simulate the relevant thermodynamic heat pump cycle for vapour compression systems. The variation of exergy efficiency factor, COP and exergy flow is outlined. Moreover focusing on the partial derivatives of pressure, on the real gas heat capacity at constant volume and on real gas heat capacity at constant pressure, useful characteristics such as sound velocity and isentropic exponents are derived and plotted in charts, for a wide area of state conditions.	en
heal.publisher	SPRINGER HEIDELBERG	en
heal.journalName	FORSCHUNG IM INGENIEURWESEN-ENGINEERING RESEARCH	en
dc.identifier.isi	ISI:000243073400008	en
dc.identifier.volume	70	en
dc.identifier.issue	4	en
dc.identifier.spage	253	en
dc.identifier.epage	261	en