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Analysis thermal performance of fiber cement tiles treated with white coatings and submitted to water spraying

Carla Fernanda Barbosa Teixeira
Total Authors: 1
Document type: Doctoral Thesis
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Defense date:
Examining board members:
Fernando Simon Westphal; João Roberto Gomes de Faria; Eduvaldo Paulo Sichieri; Racine Tadeu de Araújo Prado
Advisor: Lucila Chebel Labaki

The search for materials, technologies and ways that can get constructions more energy efficient has been a concern of researches, educators and designers not only in Brazil, but also in the world. The use of light colors on roofing has been studied a lot; like cooling strategy for hot climates. The aim of this work is to analyze thermal performance of white coatings on roofing and to estimate energy savings in a room with white coating on roofing. Evaporative cooling, added to reflective cooling, was used through rain-water spraying on coating surfaces. Some testing on coatings as thermal emissivity, solar reflectance and absorption of sprayed water were requested for characterization of coatings thermal performance. In consequence of that literature review related to these themes was necessary to investigate methodologies applied in researches which have been done in the world. Commercial and ordinary paintings (of different chemical compositions, but with same color: white) were applied on fiber cement tiles in association to water spraying in weather conditions. Inside-surface temperatures and meteorological data were collected and analyzed together with solar reflectance, thermal emissivity and water absorption by tile coatings. Results of reflective technique proved expectations and illustrated that some attention is requested to choose the kind of white painting. However, when these coatings received water spraying on surfaces, they got the best results. The white coatings influences were considered through an annual thermal simulation energy saving. This work has the purpose to contribute with existing additional information in relation to white painting available, in order to get less roofing temperatures as well as to show that the rain water usage could be a tool for decreasing drained water on streets in rainy season. (AU)

FAPESP's process: 07/08221-5 - Passive cooling applied in roofing systems as a contribution to energy efficiency in buildings
Grantee:Carla Fernanda Barbosa Teixeira
Support type: Scholarships in Brazil - Doctorate