Thermal performance of reflective materials applied to exterior building components—A review

Hernández-Pérez, I.; Álvarez, G.; Xamán, J.; Zavala-Guillén, I.; Arce, J.; Sima, Elena

doi:10.1016/j.enbuild.2014.05.008

Cited by 130 publications

(63 citation statements)

References 89 publications

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“…SUEHRCKE; PETERSON; SELBY, 2008;HERNÁNDEZ-PÉREZ et al, 2014). Segundo a NBR 15220-1 (ABNT, 2005), a absortância pode ser definida como a razão entre a taxa de radiação solar incidente e a taxa de radiação solar absorvida por uma superfície.…”

Section: Introductionunclassified

Influência da absortância solar no desempenho térmico de habitações populares

Schaefer¹,

Silva²,

Almeida³

et al. 2014

Encontro Nacional De Tecnologia Do Ambiente Construído

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RESUMOO desempenho térmico de edificações está fortemente relacionado com as características do seu envelope, dentre as quais cita-se a absortância solar. Relacionada com a cor da edificação, essa característica pode ser facilmente alterada, podendo promover melhoras no seu desempenho térmico a um baixo custo. Sob esse contexto, o objetivo deste estudo foi medir os valores de absortância solar de fachadas em habitações de interesse social da região de Florianópolis-SC e verificar sua influência no desempenho térmico destas edificações. Foram levantadas as refletâncias das fachadas de 101 habitações, com auxílio do espectrômetro portátil ALTA II. A partir dos dados de refletância medidos, calculou-se a absortância, indicador para simulação. Dois casos, um com menor área de fachada (modelo 1) e outro com maior (modelo 2), foram selecionados na amostra e submetidos à simulação computacional com o programa EnergyPlus, variandose parametricamente as absortâncias conforme levantadas em campo. Foram calculados os graus-hora de resfriamento e aquecimento a partir da temperatura operativa horária de cada ambiente, por meio da simulação. Os resultados dos levantamentos mostraram uma predominância dos casos compreendidos entre as faixas 0,1 e 0,2, sendo que em 40 habitações obtiveram absortâncias baixas, abaixo de 0,3. Nas medições, os tons de cinza, madeira natural e salmão foram os que apresentaram as menores diferenças entre si (até 0,25 de diferença), enquanto os tons verde e azul apresentaram as maiores (até 0,60 de diferença). Com os resultados das simulações observou-se uma variação nos graus-hora de resfriamento maior no modelo 1, de até 2510 °Ch. No aquecimento, a maior variação também foi no modelo 1, até 1980 °Ch. Esses valores evidenciam a influência da absortância no desempenho térmico, o que possibilita fornecer subsídios para o desenvolvimento de políticas públicas voltadas à esse tipo de habitação que promovam melhor desempenho de forma prática e a baixo custo. Palavras-chave:Habitação de interesse social, desempenho térmico, absortância solar. ABSTRACT

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Section: Introductionunclassified

Influência da absortância solar no desempenho térmico de habitações populares

Schaefer¹,

Silva²,

Almeida³

et al. 2014

Encontro Nacional De Tecnologia Do Ambiente Construído

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“…(BorgeDiez et al 2013;Sekar et al 2012) have also used CFD to address the influence of reflective exterior surfaces. More information can be found at the review study by (Hernández-Pérez et al 2014). …”

Section: Computational Fluid Dynamicsmentioning

confidence: 99%

“…More information regarding the use of BES to predict the thermal performance of exterior reflective surfaces can be found in the review study by (Hernández-Pérez et al 2014). …”

Section: Optical Properties Of Organic Coated Steel Sheetsmentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-to-ice radiation model using schematic dynamic heat flux calculations.The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is ii in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.Overall, it is concluded that the interior re...

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“…Additionally, the type of building materials used influences thermal comfort [29][30][31]. Specifically, Wafi and Ismail [29] found that different building materials (e.g.…”

Section: Building Feature Categorymentioning

confidence: 99%

Building Features in Schools That Influence Academic Performance

Salary¹,

Holliday²,

Keesee³

et al. 2018

JCEA

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School decision makers are faced with a great many decisions when considering a school renovation or new school building. All stakeholders want a building that is safe and provides an optimal learning environment. However, it is often difficult to know which building features will have the greatest effect on student learning. Because of a limited understanding of the relationship between individual building features and student learning, researchers at the University of Oklahoma hope to explore how building components influence student and teacher performance. This paper explores the importance of school building features that can be designed and changed during a renovation project. The hope is to one day determine which features have the greatest impact on student test scores. The research team believes that although it is difficult to find the exact relationship between each building features and student outcomes with one study, if multiple users repeat the same or similar studies, hopefully we will one day know the effect of these building features. In order to develop feature building users survey and physical assessment tools, it was necessary for investigators to develop a list of important building features and their associated definitions in layman terms. This was accomplished through utilization and conducting of a CAB (community advisory board) and subject matter expert materials. In addition, previous research relating to different school building features and their associations with student performance were reviewed. To define and narrow the list the researchers, community educational, and building professionals rated based on their professional experience, how directly related each feature is to student performance. The building feature list serves as a starting point to determine which features should be analyzed in a later phase of the project. It is hoped that resulting tools based on the work of this project can be used by school decision-makers and researchers to access building features that have been identified through research as being important for student and teacher performance.

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Thermal performance of reflective materials applied to exterior building components—A review

Cited by 130 publications

References 89 publications

Influência da absortância solar no desempenho térmico de habitações populares

Influência da absortância solar no desempenho térmico de habitações populares

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Building Features in Schools That Influence Academic Performance

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