Thermodynamic property formulations and heat transfer aspects for replacement refrigerants: R-123 and R-134a

Stegou-Sagia, A

dc.contributor.author	Stegou-Sagia, A	en
dc.date.accessioned	2014-03-01T01:13:28Z
dc.date.available	2014-03-01T01:13:28Z
dc.date.issued	1997	en
dc.identifier.issn	0363-907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12497
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031209486&partnerID=40&md5=55c00d2aa18d8f92da651cac3d5685c9	en
dc.subject	Alternative refrigerants	en
dc.subject	Condensation heat transfer	en
dc.subject	Isentropic change	en
dc.subject	Thermodynamic properties	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.other	Condensation	en
dc.subject.other	Enthalpy	en
dc.subject.other	Entropy	en
dc.subject.other	Heat transfer	en
dc.subject.other	Specific heat of gases	en
dc.subject.other	Ideal gas isentropic change	en
dc.subject.other	Replacement refrigerants	en
dc.subject.other	Refrigerants	en
dc.title	Thermodynamic property formulations and heat transfer aspects for replacement refrigerants: R-123 and R-134a	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	This paper reports analytical relations for the thermodynamic properties enthalpy, entropy, heat capacities at constant pressure and temperature of the replacement refrigerants R-123 and R-134a. These refrigerants are considered promising as substitutes for the fluids R-ll and R-12, respectively, which are two of the most widely used CFC refrigerants. In addition to the properties, the three real gas isentropic exponents k(p,v),k(v,T),k(p,T) are calculated, which may be used instead of the classical exponent k = c(p)/c(v), in the ideal gas isentropic change equations to describe with good accuracy the real gas behaviour. A systematic study to research the influence of various parameters on heat transfer during condensation of R-123 and R-134a on horizontal integral-fin tubes is also carried out. The results are useful in refrigeration applications to improve the basic design, as a significant concern about new refrigerants to replace the CFCs has increased very rapidly due to the destruction of stratospheric ozone and global warming. (C) 1997 by John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	International Journal of Energy Research	en
dc.identifier.isi	ISI:A1997XR68100002	en
dc.identifier.volume	21	en
dc.identifier.issue	10	en
dc.identifier.spage	871	en
dc.identifier.epage	884	en