External Thermal Insulation Composite Systems: Critical Parameters for Surface Hygrothermal Behaviour

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Eva Barreira (Autor) FEUP; Vasco P. de Freitas (Autor) FEUP

Revista

Título: Advances in Materials Science and Engineering

Vol. 2014

Páginas: 1-16

ISSN: 1687-8434

Editora: Hindawi

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 22 Citações

INSPEC

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia civil

FOS: Ciências da engenharia e tecnologias > Engenharia civil

Outras Informações

ID Authenticus: P-009-5ZZ

DOI: 10.1155/2014/650752

Abstract (EN): External Thermal Insulation Composite Systems (ETICS) are often used in Europe. Despite its thermal advantages, low cost, and ease of application, this system has serious problems of biological growth causing the cladding defacement. Recent studies pointed that biological growth is due to high values of surface moisture content, which mostly results from the combined effect of exterior surface condensation, wind-driven rain, and drying process. Based on numerical simulation, this paper points the most critical parameters involved in hygrothermal behaviour of ETICS, considering the influence of thermal and hygric properties of the external rendering, the effect of the characteristics of the facade, and the consequences of the exterior and interior climate on exterior surface condensation, wind-driven rain, and drying process. The model used was previously validated by comparison with the results of an "in situ" campaign. The results of the sensitivity analyses show that relative humidity and temperature of the exterior air, atmospheric radiation, and emissivity of the exterior rendering are the parameters that most influence exterior surface condensation. Wind-driven rain depends mostly on horizontal rain, building's height, wind velocity, and orientation. The drying capacity is influenced by short-wave absorbance, incident solar radiation, and orientation.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 16