Experimental and numerical study of unsteady non-periodic wall heat transfer under step, ramp and cosine temperature perturbations

Antonopoulos, KA; Democritou, F

dc.contributor.author	Antonopoulos, KA	en
dc.contributor.author	Democritou, F	en
dc.date.accessioned	2014-03-01T01:09:52Z
dc.date.available	2014-03-01T01:09:52Z
dc.date.issued	1994	en
dc.identifier.issn	0363-907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11227
dc.subject	WALL TEMPERATURE MEASUREMENTS	en
dc.subject	TEMPERATURE PERTURBATIONS	en
dc.subject	ENVIRONMENT SIMULATION	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.other	Air	en
dc.subject.other	Boundary value problems	en
dc.subject.other	Computer simulation	en
dc.subject.other	Correlation methods	en
dc.subject.other	Errors	en
dc.subject.other	Finite difference method	en
dc.subject.other	Heat convection	en
dc.subject.other	Perturbation techniques	en
dc.subject.other	Programmed control systems	en
dc.subject.other	Temperature measurement	en
dc.subject.other	Air temperature	en
dc.subject.other	Environment simulation	en
dc.subject.other	Temperature perturbations	en
dc.subject.other	Unsteady non periodic wall heat transfer	en
dc.subject.other	Wall temperature measurements	en
dc.subject.other	Heat transfer	en
dc.subject.other	Experimental Measurements	en
dc.subject.other	Heat Transfer	en
dc.subject.other	Mathematical Techniques	en
dc.title	Experimental and numerical study of unsteady non-periodic wall heat transfer under step, ramp and cosine temperature perturbations	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/er.4440180602	en
heal.identifier.secondary	http://dx.doi.org/10.1002/er.4440180602	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	An experimental and numerical study of the transient non-periodic wall heat transfer problem is presented. A computer-controlled indoor/outdoor environment simulation system produces any desired variation of the air temperature, thus allowing measurement of the dynamic thermal behaviour of any test wall under the desired boundary conditions. Measurements of the temperature field within the wall, of the heat flow and of the convection coefficients at the wall surfaces are performed during step, ramp and cosine perturbations of the outdoor air temperature. The measurements are in very good agreement with the numerical predictions obtained by a developed finite difference solution procedure. The results showed that in building heat transfer applications, for example in air conditioning, the usual assumption of periodic outdoor conditions may lead to considerable errors in case of a significant temporary deviation of the temperature from periodicity.	en
heal.publisher	John Wiley & Sons Ltd, Chichester, United Kingdom	en
heal.journalName	International Journal of Energy Research	en
dc.identifier.doi	10.1002/er.4440180602	en
dc.identifier.isi	ISI:A1994PM12200001	en
dc.identifier.volume	18	en
dc.identifier.issue	6	en
dc.identifier.spage	563	en
dc.identifier.epage	579	en