Performance of solar-driven ammonia-lithium nitrate and ammonia-sodium thiocyanate absorption systems operating as coolers or heat pumps in Athens

Antonopoulos, KA; Rogdakis, ED

dc.contributor.author	Antonopoulos, KA	en
dc.contributor.author	Rogdakis, ED	en
dc.date.accessioned	2014-03-01T01:12:11Z
dc.date.available	2014-03-01T01:12:11Z
dc.date.issued	1996	en
dc.identifier.issn	1359-4311	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11996
dc.subject	Absorption cooling	en
dc.subject	Absorption heat pump	en
dc.subject	Ammonia-lithium nitrate	en
dc.subject	Ammonia-sodium thiocyanate	en
dc.subject	Athens solar radiation	en
dc.subject	Solar cooling	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Absorption	en
dc.subject.other	Ammonia	en
dc.subject.other	Climatology	en
dc.subject.other	Cooling systems	en
dc.subject.other	Heat pump systems	en
dc.subject.other	Lithium compounds	en
dc.subject.other	Performance	en
dc.subject.other	Sodium compounds	en
dc.subject.other	Solar radiation	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Absorption cooling	en
dc.subject.other	Absorption heat pump	en
dc.subject.other	Ammonia-lithium nitrate	en
dc.subject.other	Ammonia-sodium thiocyanate	en
dc.subject.other	Athens solar radiation	en
dc.subject.other	Cooling power	en
dc.subject.other	Heat gain factor	en
dc.subject.other	Solar cooling	en
dc.subject.other	Summer	en
dc.subject.other	Thermal power	en
dc.subject.other	Solar equipment	en
dc.title	Performance of solar-driven ammonia-lithium nitrate and ammonia-sodium thiocyanate absorption systems operating as coolers or heat pumps in Athens	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/1359-4311(95)00046-G	en
heal.identifier.secondary	http://dx.doi.org/10.1016/1359-4311(95)00046-G	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The hour-by-hour performance of solar-driven NH3-LiNO3 and NH3-NaSCN absorption systems operating as coolers or heat pumps in the Athens area is predicted, using 20 yr of local climatological data. The exact thermodynamic cycles are represented by substitution of the composite thermodynamic processes (absorption, generation, heat exchange), which involve interactions of two or three streams by thermodynamically equivalent one-stream changes. Under the assumptions made, it becomes possible to develop two groups of correlations. The first expresses the characteristics and the performance of the absorption systems in terms of the ambient temperature only, while in the second group the behaviour of the systems is expressed in terms of the hour of the day for each day of a typical year in Athens. The main conclusions for operation in the Athens area are: (a) For cooling purposes (summer) the maximum theoretical values of the coefficient of performance and of the cooling power are 90% and 355 W/m(2), respectively, while for heating purposes (winter) the maximum theoretical values of the heat gain factor and of the useful thermal power are 210% and 344 W/m(2), respectively. (b) For heating purposes (winter), the NH3-LiNO3 system is superior to the NH3-NaSCN one, because it provides a higher heat-gain factor and useful thermal power. (9) For cooling during summer, the choice depends on the special requirements of each application, because the NH3-LiNO3 system provides higher cooling power, while the NH3-NaSCN system achieves a higher coefficient of performance.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Applied Thermal Engineering	en
dc.identifier.doi	10.1016/1359-4311(95)00046-G	en
dc.identifier.isi	ISI:A1996TT07000003	en
dc.identifier.volume	16	en
dc.identifier.issue	2	en
dc.identifier.spage	127	en
dc.identifier.epage	147	en