Specification of Glazings for Façades Based on Spectrophotometric Characterization of Transmittance

Helenice Maria Sacht, Luís Bragança, Manuela Almeida and Rosana Caram
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Helenice Maria Sacht: Latin American Institute of Technology, Infrastructure and Territory (ILATIT), Federal University for Latin American Integration (UNILA), Foz do Iguaçu, PR 85867-970, Brazil
Luís Bragança: Department of Civil Engineering, University of Minho, 4800-533 Guimarães, Portugal
Manuela Almeida: Department of Civil Engineering, University of Minho, 4800-533 Guimarães, Portugal
Rosana Caram: Institute of Architecture and Urbanism (IAU), University of São Paulo (USP), São Carlos, SP 13566-590, Brazil

Sustainability, 2021, vol. 13, issue 10, 1-19

Abstract: The correct specification of glazings for façades can reduce the energy consumption in buildings. The heat exchange occurs through transparent surfaces and radiation reaches the building as light and heat. Therefore, glazings significantly contribute to the heat transfer between outdoor and indoor spaces and act directly on daylighting and thermal comfort. This paper reports on the spectrophotometric characterization of glazings transmittance for the study of components of a modular façade system and its suitability for the climate of Portugal (temperate climate). The study focused on results of spectrophotometric measurements of optical properties, specifically the transmittance of some types of glazings (solar control, self-cleaning, low-e, float, and extra-clear) and two types of double glazings. The results show the percentage of transmission to ultraviolet, visible, and near-infrared regions and its importance, which enabled the analysis of the glazing efficiency regarding daylighting and the correlation to thermal performance. Subsidies and indications for the specification and adequate uses of transparent surfaces have been presented and complemented the datasheets available from the manufactures.

Keywords: façade; glazing; specification; transmittance; spectrophotometer tests; energy efficiency (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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