Cool Façades - Thermal Performance Assessment Using Infrared Thermography

Abstract:

High reflective paints (cool paints) can reduce solar heat gains, improving thermal comfort and energy efficiency in buildings in summer period. To evaluate the thermal performance of different reflective paints applied in façades (over ETICS like solution) a research study is being developed at LNEC using full-scale test cells built in LNEC’s campus.For this purpose, non-destructive infrared thermography method is being used. This method allows knowing the temperature distribution on façades by measuring infrared radiation emitted from its surfaces. Thermocouples placed on wall outside surfaces support thermographic diagnosis.Optical properties of cool paints (reflectance and emittance) used in this research study were achieved by additional laboratory tests.Comparative analysis between thermal performance of a white cool paint and a white conventional paint is presented in this paper. This research study also shows the potential of infrared thermography in the assessment of thermal performance of cool paints.

• Periodical: Key Engineering Materials (Volume 634)
• Pages: 14-21
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.634.14
• Online since: December 2014
• Authors: Luís Matias, Luís Gonçalves, Alexandra Costa, Carlos Pina Santos
• Keywords: Emittance, Infrared Thermography, Reflectance, Reflective Paints

References

[1] I. Hernández-Pérez; G. Álvarez; J. Xamán I. Zavala-Guillén ; J. Arce; E. Simá – Thermal performance of reflective materials applied to exterior building components. A review. Energy and Buildings, volume 80 (2014) , pp.81-105.

DOI: 10.1016/j.enbuild.2014.05.008

[2] Hui Shen, Hongwei Tan, Athanasios Tzempelikos – The effect of reflective coatings on building surface temperatures, indoor environment and energy consumption. An experimental study. Energy and Buildings, Volume 43, Issues 2–3, February–March 2011, Pages 573-580.

DOI: 10.1016/j.enbuild.2010.10.024

[3] Levinson R., Akbari H., Berdahl P., Wood K., Skilton W., Petersheim J. (2010) A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products. Solar Energy Materials and Solar Cells, 94 (6) , pp.946-954.

DOI: 10.1016/j.solmat.2009.12.012

[4] Karlessi T., Santamouris M., Apostolakis K., Synnefa A., Livada I. – Development and testing of thermochromic coatings for buildings and urban structures. Solar Energy, 83 (4) , pp.538-551 (2009).

DOI: 10.1016/j.solener.2008.10.005

[5] A. Costa, C. Pina dos Santos – Avaliação de produtos de alta refletância na reabilitação de coberturas planas. Estudo experimental in: Congresso Luso-Brasileiro de Materiais de Construção Sustentáveis, CLB-MCS, proceedings. Guimarães (Portugal), March (2014).

DOI: 10.20906/cps/cb-01-0080

[6] L. Matias – Testing techniques for structures inspection. Thermography in: DuratiNet Course book: Lisbon, LNEC, 29th to 30th May (2012).

[7] X. Maldague - Theory and Practice of Infrared Technology for Nondestructive Testing. ISBN 0-471-18190-0. John Wiley & Sons, (2001).

[8] L. Matias - Evaluation of thermal performance of reflective protections applied on bent roofs. ISBN 972-49-1937-4. Coleção Teses de Mestrado: Lisbon, LNEC (TM6), (2002).

[9] American Society for Testing and Materials (ASTM) – Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques. ASTM E408: (2008).

DOI: 10.1520/e0408-71r96e01