SIMULAÇÃO TERMOENERGÉTICA E ANÁLISE ECONÔMICA DO USO DE TELHADOS DE FIBROCIMENTO DE ALTA REFLETÂNCIA SOLAR EM UMA RESIDÊNCIA UNIFAMILIAR
DOI:
https://doi.org/10.46421/entac.v18i.734Keywords:
Cool roof, Solar reflectance, Thermal emission, Economic analysisAbstract
The use of roofs with high solar reflectance is a passive strategy to reduce the cooling load on buildings. The use of these roofs also has the potential to mitigate the heat island phenomenon. This work aims to analyze the thermoenergetic performance and the economic viability of applying a roof with high solar reflectance in a single-family building, located in the city of Rio de Janeiro. The type of tile selected was the fiber cement, being analyzed in the color in natural and white. The measurement of solar reflectance and thermal emission was performed for the two colors of the tile, as well as the calculation of the Solar Reflectance Index (SRI). Thermoenergetic analysis was performed using the EnergyPlus software. The economic analysis was carried out using the financial indicators: Net Present Value, Internal Rate of Return and payback. The roof with high solar reflectance reduces heat gain through the roof by up to 60% and the economic analysis proved to be viable for the proposed scenario with a payback of less than 5 years.
References
ABNT. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 15220-2 – Desempenho térmicode edificações. Parte 2. Rio de Janeiro, 2005.
_____. NBR 15575-1 –Desempenho de edificações habitacionais. Rio de Janeiro, 2013.
AKBARI, H.; LEVINSON, R.; MILLER, W.; BERDAHL, P. Cool colored roofs to save energy and improve air quality. In: International Conference on Passive and Low Energy Cooling for the Built Environment. Santorini, Grécia. p. 89-100, 2005.
ASTM – AMERICAN SOCIETY FOR TESTING AND MATERIALS. C1371-15: Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers. ASTM International, 2015.
_____. E1980-01: Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces. ASTM International, 2011.
_____. E903-12: Standard Test Method for Solar Absorptance, Reflectance and Transmittance of Materials Using Integrating Spheres. ASTM International, 2012.
BRETZ, S.E.; AKBARI, H. Long-term performance of high-albedo roof coatings. Energy and Buildings, v. 25, p. 159-167, 1997.
BANCO CENTRAL DO BRASIL. Taxa Selic. Brasília, 2019.
CAIXA. Cadernos CAIXA Projeto padrão – casas populares| 42m². 2007.
CAIXA. SINAPI_ref_Insumos_Composicoes_RJ_052019_NaoDesonerado. 2019.
CAO, X.; DAI, X.; LIU, J. Building energy-consumption status worldwide and the state-of-the-art technologies for zero-energy buildings during the past decade. Energy and Buildings, v. 128, p. 198-213, 2016.
IBGE (Instituto Brasileiro de Geografia e Estatística). Índice Nacional de Preços ao Consumidor (INPC) – Série Histórica 2012 a 2020. Rio de Janeiro, 2019.
LIGHT. Composição da Tarifa. Rio de Janeiro, 2019a.
LIGHT. Histórico do Efeito Médio Percebido. Rio de Janeiro, 2019b.
PEREIRA, C. D. Influência da refletância e da emitância de superfícies externas no desempenho térmico de edificações. Tese (Doutorado em Engenharia Civil) – Programa de Pós-Graduação em Engenharia Civil, UFSC. Florianópolis, 2014.
PISELLO, A.L.; CASTALDO, V.L.; PIGNATTA, G.; COTANA, F.; SANTAMOURIS, M. Experimental inlab and in-field analysis of waterproof membranes for cool roof application and urban heat island Mitigation. Energy and Buildings, v. 114, p. 180-190, 2016.
SANTAMOURIS, M. Cooling the cities – A review of reflective and green roof mitigation technologies to fight heat island and improve comfort in urban environments. Solar Energy, v. 103, p. 682 – 703, 2014.
SILVA, A.L.G.; ETULAIN, C. Avaliação do Impacto Econômico da Proibição do Uso do Amianto na Construção Civil no Brasil - Convênio de Cooperação Técnica 4416 – ABIFibro/Unicamp –Relatório Final de Pesquisa. 2010.
SILVA, M. P. Simulação termoenergética e análise econômica do uso de telhados de alta refletância solar em uma residência unifamiliar. Dissertação – Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Santa Catarina. Florianópolis, 2019.
SYNNEFA, A.; SANTAMOURIS, M.; AKBARI, H. Estimating the effect of using cool coatings on energy loads and thermal comfort in residential buildings in various climatic conditions.
Energy and Buildings, v. 39, p. 1167-1174, 2007.
