Thermodynamic correlations, k - Exponents, speed of sound, and COP data for binary refrigerant mixtures

Stegou-Sagia, A; Damanakis, M

dc.contributor.author	Stegou-Sagia, A	en
dc.contributor.author	Damanakis, M	en
dc.date.accessioned	2014-03-01T01:21:38Z
dc.date.available	2014-03-01T01:21:38Z
dc.date.issued	2004	en
dc.identifier.issn	13019724	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16288
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-2542433355&partnerID=40&md5=d4bb8b3f6979f7a79da0005a982dce5f	en
dc.relation.uri	http://www.icatweb.org/vol7/7.1/07-(15-22)-sagia.pdf	en
dc.subject	Coefficient of performance	en
dc.subject	Constant-pressure and constant-volume specific heats	en
dc.subject	Enthalpy	en
dc.subject	Entropy	en
dc.subject	Isentropic exponents	en
dc.subject	R-32/R-134a mixtures	en
dc.subject	Speed of sound	en
dc.subject.other	Acoustic wave velocity	en
dc.subject.other	Compaction	en
dc.subject.other	Composition	en
dc.subject.other	Correlation methods	en
dc.subject.other	Enthalpy	en
dc.subject.other	Entropy	en
dc.subject.other	Specific heat	en
dc.subject.other	Coefficient of performance	en
dc.subject.other	Constant-pressure and constant-volume specific heats	en
dc.subject.other	Isentropic exponents	en
dc.subject.other	R-32/R-134a mixtures	en
dc.subject.other	Refrigerants	en
dc.title	Thermodynamic correlations, k - Exponents, speed of sound, and COP data for binary refrigerant mixtures	en
heal.type	journalArticle	en
heal.publicationDate	2004	en
heal.abstract	Our study covers thermodynamic performance quantities for binary refrigerant mixtures of R-32/R-134a with compositions of 20/80%, 30/70%, 40/60% by mass for a wide range of thermodynamic conditions (pressure: 0.2 - 3.0 MPa, temperature: 240 - 480°K and saturated conditions). The primary thrust of the study is the calculation of coefficient of performance (COP) values for refrigeration systems. Additional attention is also given to speed of sound data and to isentropic process changes. The relevant COPs are derived based on a simplified reference refrigeration cycle with one stage compression and throttling, saturated vapor and no liquid sub-cooling prior to the throttling valve. The COP values are given for various condensing and evaporating temperatures. For all calculations, a Peng - Robinson type equation of state is used to determine the necessary fluid properties. The enthalpy, entropy, and constant-pressure and constant-volume specific heats as well as the k-type isentropic change exponents are presented for all mixtures for the range of thermodynamics conditions listed above. Comparisons are made illustrating the influence of pressure and temperature on the k-type exponents kp,v, kT,v, and kp,T and on the ratio of specific heats k (k = cp/cv). Furthermore, graphs with speed of sound data for this extended range of conditions are also given.	en
heal.journalName	International Journal of Thermodynamics	en
dc.identifier.volume	7	en
dc.identifier.issue	1	en
dc.identifier.spage	15	en
dc.identifier.epage	22	en