Evaluation of the thermal performance of different cold materials for urban paving

Castro, Luís; Degues, K. M.; Cypriano, Mateus Gonçalves; Rocha, Márcio Roberto da; Montedo, Oscar Rubem Klegues; Angioletto, Elídio

doi:10.1590/0366-69132017633662063

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Additionally, it is observed that cristobalite (JCPDS: 075-0923) was contained after calcination treatment (up to 700°C) but it disappears at 1525°C [20]. Contrarily, the signals that were located above 55°2theta corresponded in their great majority to quartz (JCPDS: 46-1045) [21] and mordenite since these phases prevail after calcination at 700°C. Lastly, it was observed that zeolitic structures persisted after the thermal treatment with the exception of heulandite.…”

Section: Results and Conclusionmentioning

confidence: 94%

Photo-Fenton Degradation of RB5 Dye in Aqueous Solution Using Fe Supported on Mexican Natural Zeolite

Domenzain-Gonzalez

Castro-Arellano

Galicia‐Luna

et al. 2019

International Journal of Photoenergy

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A Mexican natural zeolite (MNZ) was impregnated with Fe at concentrations of 5 and 10 mg FeCl3/g MNZ (MNZ/Fe) in order to study the photo-Fenton degradation of Reactive Black 5 (RB5) dye. Two samples were prepared and calcined at 550 and 700°C for each concentration. These samples were also characterized by the following techniques: X-ray diffraction (XRD) to determine crystalline phases of mineral, X-ray photoelectron spectroscopy (XPS) to observe the elemental composition of the material where the main element was Fe as Fe2p, Mössbauer to establish the phases in the material which were magnetite (Fe3O4), fayalite, and chlorite, Raman to corroborate that magnetite clusters in natural material were presented, and transmission electron microscopy (TEM) by which magnetite nanoparticles were observe on zeolite surface. Afterwards, the catalytic degradation of RB5 dye was performed by photo-Fenton process using a 2.2 W lamp as a radiation source. Four initial concentrations of RB5 dye ((RB5)0) were evaluated which ranged from 40 to 100 mg/L. Then, the evaluation reaction was carried out by UV-Vis spectroscopy to know the change in RB5 concentration and chemical oxygen demand (COD) removal to determine the organic carbon. The best results on the photo-Fenton degradation was 91% discoloration and 68.5% chemical oxygen demand removal based on an initial concentration RB50=100 mg/L and 10 mg MNZ/Fe (700°C of calcined temperature) at MNZ/Fe=0.05 g/L catalyst dose in aqueous solution, H2O2=3 g/L, pH=2.5, and 180 minutes of reaction time. Subsequently, variations on (RB5)0, pH, (H2O2), and (MNZ/Fe) were assessed in order to optimize the process by keeping 10 MNZ/Fe. The optimal RB5 dye degradation was achieved at RB50=100 mg/L in the presence of MNZ/Fe=0.2 g/L, H2O2=3 g/L and pH=2.5 where the highest discoloration and chemical oxygen demand removal were 93 and 70.5 at 180 min. Finally, the kinetic reaction was evaluated as a pseudo-first-order kinetics with an apparent rate constant (kapp) of 0.0225 min-1 at latest conditions.

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Section: Results and Conclusionmentioning

confidence: 94%

Photo-Fenton Degradation of RB5 Dye in Aqueous Solution Using Fe Supported on Mexican Natural Zeolite

Domenzain-Gonzalez

Castro-Arellano

Galicia‐Luna

et al. 2019

International Journal of Photoenergy

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“…Na cidade de Criciúma SC pesquisadores (CASTRO et al, 2017) investigam a influência da pavimentação urbana e os efeitos com o fenômeno no aquecimento da cidade. O estudo foi desenvolvido com propósito de desenvolver, testar e avaliar novos materiais frios para uso em pavimentação, sendo esse, na visão dos pesquisadores, o fator responsável por significativa contribuição para a ocorrência das ilhas de calor nas cidades, pois os materiais frios apresentam melhor desempenho térmico que os materiais convencionais (como asfalto e concreto).…”

Section: Introductionunclassified

Transferência De Calor Em Materiais Para Cobertura

Funes,

Reis Junior,

Acir Fretta

et al. 2023

REEC

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RESUMO: Mudanças climáticas têm influenciado no microclima dos centros urbanos e nas características das construções. O desempenho térmico dos envolventes pode interferir na eficiência energética e na sustentabilidade da edificação devido ao uso de climatização do ar. A pesquisa tem por objetivo avaliar as diferenças entre temperaturas externas e internas nos protótipos com diferentes materiais na cobertura. O manuscrito contempla uma pesquisa aplicada utilizando diferentes materiais, com e sem isolamento térmico, nas coberturas como telhas de fibrocimento, telha de cerâmica e telha metálica aplicadas em protótipos construídos com painel de madeira plastificada. No experimento foi avaliado as temperaturas dos ambientes externas e internas dos protótipos. Também, foi verificado as temperaturas nas faces externas e internas das coberturas com uso de termômetro infravermelho e termômetro ambiente. Os dados obtidos nas avaliações das temperaturas foram coletados no período de 5 dias, em três horários diferentes (10, 12 e 16 horas), organizados e analisados em planilha. Os resultados demonstraram que houve variação significativa entre as coberturas com e sem isolamento térmico. Quanto ao tipo de cobertura, o estudo conclui que a telha metálica com isolamento apresentou os melhores resultados de isolamento, reduzindo a transferência de calor do ambiente externo para interno dos protótipos. ABSTRACT: Climate changes have influenced the microclimate of urban centers and the characteristics of buildings. The thermal performance of the surroundings can interfere with the energy efficiency and sustainability of the building due to the use of air conditioning. The research aims to evaluate the differences between external and internal temperatures in prototypes with different roof materials. The manuscript includes applied research using different materials, with and without thermal insulation, in roofs such as fiber cement tiles, ceramic tile, and metallic tile applied in prototypes built with plasticized wood panels. In the experiment, the temperatures of the external and internal environments of the prototypes were evaluated. Also, the temperatures on the external and internal faces of the roofs were verified using an infrared thermometer and an ambient thermometer. The data obtained in the temperature assessments were collected over a period of 5 days, at three different times (10, 12, and 16 hours), organized, and analyzed in a spreadsheet. The results showed that there was a significant variation between the roofs with and without thermal insulation. As for the type of cover, the study concludes that the metal tile with insulation presented the best insulation results, reducing the heat transfer from the external environment to the internal environment of the prototypes.

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Design recommendations for the rehabilitation of an urban canyon in a subtropical climate region using aerial thermography and simulation tools

Rodriguez,

Melgar,

Marquez

2023

Energy and Buildings

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Evaluation of the thermal performance of different cold materials for urban paving

Cited by 3 publications

References 11 publications

Photo-Fenton Degradation of RB5 Dye in Aqueous Solution Using Fe Supported on Mexican Natural Zeolite

Photo-Fenton Degradation of RB5 Dye in Aqueous Solution Using Fe Supported on Mexican Natural Zeolite

Transferência De Calor Em Materiais Para Cobertura

Design recommendations for the rehabilitation of an urban canyon in a subtropical climate region using aerial thermography and simulation tools

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