Vida útil de revestimento frio e autolimpante.

Werle, Ana Paula

doi:10.11606/t.3.2016.tde-02052016-163421

Cited by 2 publications

(9 citation statements)

References 9 publications

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“…In Brazil, several studies have been reported by [9,15,16,[25][26][27][28][29], with ongoing research being carried out by the members of the University of São Paulo and Federal University of Santa Catarina. In the studies proposed by [15], a white cool paint was exposed in 4 cities of the country (São Paulo, Pirassununga, Belém and São Sebastião) and presented different levels of degradation between the sites, caused by different weather conditions, microflora, and pollutants.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The first major factor that influenced the degradation of cool surfaces was pointed out by the authors that studied reflectance performance in more than one exposure site [9,10,15,19,20] with verification proving its effects on durability after comparing these results with single exposure site data.…”

Section: Macroclimatementioning

confidence: 99%

“…Based on the data analysed, lower inclinations tend to be the conditions with higher reflectance loss, probably due the dust accumulation and lower velocities of rain flow, with vertical exposure Werle (2015) [9] The ES is positioned on the ground, close to a grid and surrounded by a tall building After one year of natural exposure of photocatalytic mortars, it was observed by microscopy the presence of grey particles and the growth of filamentous fungi.…”

Section: Tilt Of Exposurementioning

confidence: 99%

“…Silva (2017) [28] The ES is located next to the one used by Werle (2015), presenting the same local characteristics, except for the angulation of exposure. In the study conducted by Silva (2017), the results indicates that all samples analysed became darker, however there is no analysis of the causes, which can be attributed both by dust deposition and microbial growth.…”

Section: Tilt Of Exposurementioning

confidence: 99%

“…As alternatives to mitigate the UHIE, passive technologies have been studied in the past decades, such as the application of materials with high reflectance and high emittance, which is the ability to reflect the biggest fraction of solar radiation, and the ability that describes how fast a material can release the absorbed heat to the environment, respectively. These materials, known as "cool surfaces" (CS), are usually applied as "cool roofs", but have also been developed for several applications, with examples including wall coatings [4], pavements [5], clay tiles [6], cool colourful coatings [7,8], and self-cleaning products [9,10]. According to [11], increasing 0.25 of the roof's albedo between the latitudes 45°N and 45°S could prevent the emission of 90Gt of CO2, which is equivalent to 3 years of the global emission rate.…”

Section: Introductionmentioning

confidence: 99%

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Durability of high reflective materials designed for building envelopes

Lima

Shirakawa

John

2022

IOP Conf. Ser.: Earth Environ. Sci.

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As an alternative to mitigate the urban heat island effect, materials known as “cool surfaces” are a suitable passive technology for reducing heat transmittance into buildings and diminishing the electricity demand for cooling. However, due to ageing, the performance of cool surfaces becomes less effective, with decreasing solar reflectance generated by dust accumulation and microbial growth. However, there is little literature on the subject and the data usually present a local perspective in durability which makes harder to compare with other cases. This research conducted a systematic review on works approaching natural ageing of highly reflective materials to identify the main factors that influence the albedo durability of cool surfaces. The main factors found were macroclimate, microclimate, the tilt of exposure, materials characteristics, and substrate. The data analyses conducted in this research highlight the importance of having a general perspective when studying reflectance durability, since agents that don’t seem relevant when evaluating a local case can be important when comparing the general figure. The inspection promoted by this study might help future research to better analyse their results and connect the diffuse knowledge in the current state of the art.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Macroclimatementioning

confidence: 99%

Section: Tilt Of Exposurementioning

confidence: 99%

Section: Tilt Of Exposurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Durability of high reflective materials designed for building envelopes

Lima

Shirakawa

John

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Revestimentos frios para coberturas e fachadas no Brasil: caracterização e avaliação do desempenho térmico

Andrade¹

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One way to contribute with reduction of greenhouse gas emissions and air pollution is decreasing energy consumption for cooling purposes in buildings, among solutions, using cool materials as coatings in buildings. Cool material has high reflectance of specular and diffuse components of solar radiation and its surface heats up less than a conventional one with same topcoat. Thus, research's aim was to evaluate optical, thermal and chemical properties of cool coatings available in Brazil and their relationship with thermal performance for buildings' envelope. Thus, coatings were chosen for use on walls and roofs buildings' which have "thermal" or "reflective" denomination from products available on national market. In this way, tiles, paints and reflective powder additive (to be added to conventional paints) for roofs and facades were evaluated. Measurements were performed of CIELab color coordinates, solar reflectance and thermal emittance were performed using standardized methods and equipment for 34 cool materials and 07 reference materials. Thermal images of samples exposed to the Sun were recorded in the city of Sao Carlos (SP) and, in addition, chemical analysis quantified chemical elements present on samples' surface. Results showed that: a) visible spectral region contributed with the greatest temperature reduction by multiple regression analysis. Therefore, lighter-colored surfaces heat up less, into a greater level, because of their greater visible reflectance and had the lowest surface temperatures; b) dark reflective materials, despite greater reflectance in the near infrared than visible, did not obtain lower surface temperatures in relation to the conventional ones; c) all evaluated materials presented high thermal emittance with insignificant variations concerning conventional ones and d) correlation analyzes indicated that higher concentration of metallic element titanium decreases thermal emittance, however, no statistical significance was found between greater amounts of titanium or silicon, from inorganic oxides, with increased near-infrared or solar reflectance. This research aimed for identify which chemical components present on cool materials surface interfere with solar reflectance and thermal emittance highest values and therefore contribute with information to assist in most appropriate choice of reflective coatings for building envelope.

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Vida útil de revestimento frio e autolimpante.

Cited by 2 publications

References 9 publications

Durability of high reflective materials designed for building envelopes

Durability of high reflective materials designed for building envelopes

Revestimentos frios para coberturas e fachadas no Brasil: caracterização e avaliação do desempenho térmico

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