Improvement of a functional method to determine the design thermal transmittance of building façades. Implementation in southern Spain

Pérez-Bella, J.M. (Universidad de Zaragoza) ; Domínguez-Hernández, J. (Universidad de Zaragoza) ; Cano-Suñén, E. (Universidad de Zaragoza) ; Alonso-Martínez, M. ; del Coz-Díaz, J.J.

Resumen: The thermo-hygrometric conditions to which construction materials are subjected cause their thermal performance to vary by location. These variations must be characterised in order to design building envelopes adjusted to the requirements of each situation, thus contributing to improve their energy efficiency under actual operating conditions. To this end, a functional calculation procedure that corrects the standardised thermal conductivity values of façade materials (¿-value) has been recently proposed; which considers the climatic characteristics of each location. This work proposes and validates improvements that, while preserving its functionality, overcome some limitations of the original procedure. To calculate more accurate corrections, the façade configuration and the climatic zones established by the building codes are also considered, allowing a more reliable characterisation of the design thermal transmittance of each building façade. By using climatic records gathered from 316 weather stations, a detailed isopleth map is also developed to present the applicable corrections for more than 250, 000 km2 of southern Spain. The largest ¿-value corrections are identified on the southeast coast and reach up to +6% in the summer months (with average annual corrections above +4%). This improved procedure can be extrapolated to any national building code that establishes constant values of thermal conductivity for façade materials and that defines thermal design requirements based on climatic zones.

Idioma: Inglés

DOI: 10.1016/j.jobe.2020.101231

Año: 2020

Publicado en: Journal of Building Engineering 30 (2020), 101231 [12 pp.]
ISSN: 2352-7102

Factor impacto JCR: 5.318 (2020)

Categ. JCR: ENGINEERING, CIVIL rank: 13 / 136 = 0.096 (2020) - Q1 - T1
Categ. JCR: CONSTRUCTION & BUILDING TECHNOLOGY rank: 13 / 66 = 0.197 (2020) - Q1 - T1

Factor impacto SCIMAGO: 0.973 - Architecture (Q1) - Building and Construction (Q1) - Safety, Risk, Reliability and Quality (Q1) - Mechanics of Materials (Q1) - Civil and Structural Engineering (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/PGC2018-098459-B-I00

Tipo y forma: Article (PostPrint)

Área (Departamento): Area Ingeniería Construcción (Dpto. Ingeniería Mecánica)