Using Orthogonal Expansion of Functions Over Multilayer Walls for Calculating the Layer Thermal Properties

 
see the original item page
in the repository's web site and access all digital files if the item*
share




1997 (EN)
Using Orthogonal Expansion of Functions Over Multilayer Walls for Calculating the Layer Thermal Properties (EN)

Vrachopoulos, M (EN)
Antonopoulos, KA (EN)
Tzivanidis, C (EN)

N/A (EN)

An analytical method is presented for on-site estimation of the layer thermal properties of multilayer walls, based on separation of time and space variables, and on orthogonal expansion of functions over the multilayer walls. The advantage of the present method over previous analytical and numerical ones is that it requires temperature measurements on the outdoor and/or indoor wall surfaces, and not necessarily at locations within the wall, as previous procedures for multilayer walls do. The proposed method was tested theoretically and experimentally by applying it to multilayer walls of known properties. The agreement between calculated and known values was very good in all tests. The proposed method may be used for ex-post examination of structural materials used by a constructor, in analogous applications concerning archaeological monuments, and in the estimation of heating and cooling loads in old buildings with multilayer walls of unknown materials. The method may also be used in the design of special purpose buildings for selecting structural materials, which should meet certain temperature specifications. Copyright (C) 1996 Elsevier Science Ltd. (EN)

journalArticle

Structural design (EN)
Building materials (EN)
Estimation (EN)
Numerical methods (EN)
Heat capacity (EN)
Multilayer walls (EN)
Transient heat conduction (EN)
Heat conduction (EN)
Temperature measurement (EN)
Specific heat (EN)
Multilayers (EN)
Numerical analysis (EN)
Walls (structural partitions) (EN)
Thermal conductivity (EN)
Property estimation (EN)
Thermodynamic properties (EN)
Orthogonal expansion of functions (EN)
Heat transfer (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Applied Thermal Engineering (EN)

1997


PERGAMON-ELSEVIER SCIENCE LTD (EN)



*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)