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

Advances in Materials Science and Engineering. 2014;2014 DOI 10.1155/2014/650752

 

Journal Homepage

Journal Title: Advances in Materials Science and Engineering

ISSN: 1687-8434 (Print); 1687-8442 (Online)

Publisher: Hindawi Publishing Corporation

LCC Subject Category: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials | Science: Physics

Country of publisher: Egypt

Language of fulltext: English

Full-text formats available: PDF, HTML, ePUB, XML

 

AUTHORS

Eva Barreira (Laboratory of Building Physics (LFC), Civil Engineering Department (DEC), Faculty of Engineering-University of Porto (FE/UP), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal)
Vasco P. de Freitas (Laboratory of Building Physics (LFC), Civil Engineering Department (DEC), Faculty of Engineering-University of Porto (FE/UP), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 19 weeks

 

Abstract | Full Text

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 façade, 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.