Three-dimensional evaporation process in aqua-ammonia absorption refrigerators using helium as inert gas

Kouremenos, DA; Stegou-Sagia, A; Antonopoulos, KA

dc.contributor.author	Kouremenos, DA	en
dc.contributor.author	Stegou-Sagia, A	en
dc.contributor.author	Antonopoulos, KA	en
dc.date.accessioned	2014-03-01T01:42:42Z
dc.date.available	2014-03-01T01:42:42Z
dc.date.issued	1994	en
dc.identifier.issn	01407007	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23907
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-38149143922&partnerID=40&md5=f3428a7495b6f897306d7122271156aa	en
dc.subject	absorption	en
dc.subject	ammonia	en
dc.subject	calculation	en
dc.subject	evaporation	en
dc.subject	gas	en
dc.subject	helium	en
dc.subject	hydrogen	en
dc.subject	refrigerator	en
dc.title	Three-dimensional evaporation process in aqua-ammonia absorption refrigerators using helium as inert gas	en
heal.type	journalArticle	en
heal.publicationDate	1994	en
heal.abstract	Helium is proposed as a hydrogen substitute in inert gas absorption refrigerators, in order to eliminate the danger of a possible explosion. Attention is focused on the evaporator of such units and a solution is obtained for the three-dimensional evaporation process of a liquid ammonia stream of circular meniscus cross-section flowing parallel to an ammonia-helium gas mixture. The analysis is based on a finite- difference solution of the three-dimensional momentum, heat and mass transfer differential equations within a nearly horizontal evaporation tube. Calculations are also performed using hydrogen instead of helium in order to compare their behaviour as inert gases in aqua-ammonia absorption refrigerators. Under corresponding conditions, higher entropy increase and cooling capacity are observed in the case of helium. Generally, the behaviour of the latter is deemed satisfactory and therefore helium may replace hydrogen. © 1994.	en
heal.journalName	International Journal of Refrigeration	en
dc.identifier.volume	17	en
dc.identifier.issue	1	en
dc.identifier.spage	58	en
dc.identifier.epage	67	en