Analytical solution of the inverse unsteady wall heat conduction problem and experimental application

Antonopoulos, KA; Vrachopoulos, M

dc.contributor.author	Antonopoulos, KA	en
dc.contributor.author	Vrachopoulos, M	en
dc.date.accessioned	2014-03-01T01:11:42Z
dc.date.available	2014-03-01T01:11:42Z
dc.date.issued	1996	en
dc.identifier.issn	0363-907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11786
dc.subject	Inverse analytical solution	en
dc.subject	Unsteady heat conduction	en
dc.subject	Wall thermal properties	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.other	Building materials	en
dc.subject.other	Buildings	en
dc.subject.other	Calculations	en
dc.subject.other	Cooling	en
dc.subject.other	Estimation	en
dc.subject.other	Heating	en
dc.subject.other	Inverse problems	en
dc.subject.other	Specific heat	en
dc.subject.other	Temperature measurement	en
dc.subject.other	Thermal conductivity	en
dc.subject.other	Thermodynamic properties	en
dc.subject.other	Walls (structural partitions)	en
dc.subject.other	Inverse analytical solution	en
dc.subject.other	Inverse unsteady wall heat conduction problem	en
dc.subject.other	Old buildings	en
dc.subject.other	Structural elements	en
dc.subject.other	Unknown wall properties	en
dc.subject.other	Heat conduction	en
dc.subject.other	analysis-mathematical	en
dc.subject.other	thermal conductivity	en
dc.subject.other	walls	en
dc.title	Analytical solution of the inverse unsteady wall heat conduction problem and experimental application	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/(SICI)1099-114X(199609)20:9<745::AID-ER189>3.0.CO;2-Y	en
heal.identifier.secondary	http://dx.doi.org/10.1002/(SICI)1099-114X(199609)20:9<745::AID-ER189>3.0.CO;2-Y	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	Based on the analytical solution of the unsteady heat conduction differential equation, a solution procedure is presented for the inverse unsteady wall heat conduction problem, i.e. for the calculation of the thermal properties of structural elements of existing buildings under real transient conditions, using on-site temperature measurements. Previous procedures, which were based on the finite-difference method, required a considerable number of temperature measurements in space and time within the wall. The advantage of the present analytical procedure is that it requires only two temperature measurements, apart from some information on the outdoor and indoor temperature variations. The two temperature measurements may be taken on the outdoor and indoor wall surfaces at the same time level, or on one of these surfaces at two different time levels. The proposed analytical procedure provides the values of the thermal conductivity and heat capacity of structural elements, and therefore it may be used in practice for ex post checking of the materials used by the constructor, or for load calculation when heating or cooling systems are to be installed in old buildings of unknown wall properties. Experimental examples are presented which show that the proposed analytical procedure may be applied in practice with very good accuracy.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	International Journal of Energy Research	en
dc.identifier.doi	10.1002/(SICI)1099-114X(199609)20:9<745::AID-ER189>3.0.CO;2-Y	en
dc.identifier.isi	ISI:A1996VH22500001	en
dc.identifier.volume	20	en
dc.identifier.issue	9	en
dc.identifier.spage	745	en
dc.identifier.epage	762	en