Investigation of ejector design at optimum operating condition

Rogdakis, ED; Alexis, GK

dc.contributor.author	Rogdakis, ED	en
dc.contributor.author	Alexis, GK	en
dc.date.accessioned	2014-03-01T01:15:40Z
dc.date.available	2014-03-01T01:15:40Z
dc.date.issued	2000	en
dc.identifier.issn	0196-8904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13657
dc.subject	ammonia-water mixture	en
dc.subject	ejector	en
dc.subject	shock phenomena	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Mechanics	en
dc.subject.classification	Physics, Nuclear	en
dc.title	Investigation of ejector design at optimum operating condition	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0196-8904(00)00030-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0196-8904(00)00030-3	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	In the present work, an improved ejector theory, which was developed by Munday and Bagster is used, in order to study the thermodynamic behavior of the mixture NH3-H2O through an ejector. This ejector can be operated in combined ejector-absorption cycle using the binary mixture of ammonia-water. Kouremenos et al. showed that the heat gain factor (HGF) of a combined ejector-absorption system is 0.8-37.7% greater than those of the conventional absorption system. The design of ejector is based on Keenan et al.'s theory. Taking into account that the primary, secondary and back pressures are constant, there is a pressure before the shock where the flow entrainment ratio and the performance of the cycle (refrigeration or heat pump cycle) take maximum values. For this optimum value of flow entrainment ratio w, the value of area ratio A(t)/A(d) (cross section of minimum area of primary nozzle/cross section of constant area duct) can be estimated for an ejector's optimum design. The operation conditions were : primary pressure, 30-50 bar; secondary pressure, 3-5 bar; back pressure 10-14 bar; and mass fraction of ammonia vapor 97%. (C) 2000 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	ENERGY CONVERSION AND MANAGEMENT	en
dc.identifier.doi	10.1016/S0196-8904(00)00030-3	en
dc.identifier.isi	ISI:000088708900002	en
dc.identifier.volume	41	en
dc.identifier.issue	17	en
dc.identifier.spage	1841	en
dc.identifier.epage	1849	en