Terrestrial Radiation: Field Characteristics

Coulson, Kinsell L.

doi:10.1016/b978-0-12-192950-3.50014-0

Cited by 5 publications

(6 citation statements)

References 28 publications

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“…The angular confinement of solar irradiation in the sky enables a complementary approach to passive daytime radiative cooling. Figure 1b shows the normalized clear-sky short-wavelength radiance for a solar zenith angle of 40° that illustrates the solar irradiation contribution from different parts of the sky 34 , 35 . The plot also shows the angular atmospheric transmittance at a representative wavelength of 10.5 µm estimated using τ atm ( λ , θ ) = τ 0 ( λ ) 1/cos θ 10 , where θ represents the zenith angle and τ 0 ( λ ) represents the atmospheric transmittance in the zenith direction.…”

Section: Resultsmentioning

confidence: 99%

Passive directional sub-ambient daytime radiative cooling

et al. 2018

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Demonstrations of passive daytime radiative cooling have primarily relied on complex and costly spectrally selective nanophotonic structures with high emissivity in the transparent atmospheric spectral window and high reflectivity in the solar spectrum. Here, we show a directional approach to passive radiative cooling that exploits the angular confinement of solar irradiation in the sky to achieve sub-ambient cooling during the day regardless of the emitter properties in the solar spectrum. We experimentally demonstrate this approach using a setup comprising a polished aluminum disk that reflects direct solar irradiation and a white infrared-transparent polyethylene convection cover that minimizes diffuse solar irradiation. Measurements performed around solar noon show a minimum temperature of 6 °C below ambient temperature and maximum cooling power of 45 W m–2. Our passive cooling approach, realized using commonly available low-cost materials, could improve the performance of existing cooling systems and enable next-generation thermal management and refrigeration solutions.

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Section: Resultsmentioning

confidence: 99%

Passive directional sub-ambient daytime radiative cooling

et al. 2018

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“…A temperatura do Sol (∼5900 K)é significativamente superior a temperatura da atmosfera e superfície terrestre. Considerando que ambos seguem aproximadamente a lei de Planck, as emissões de radiação pela superfície terrestre ocorrem em comprimentos de onda maiores (4 a 100 µm com picos de 10 a 12 µm) [19]. A Fig.…”

Section: Processos Radiativos Na Atmosferaunclassified

Aplicações de redes neurais e previsões de disponibilidade de recursos energéticos solares

Fiorin

Martins

Schuch

et al. 2011

Rev. Bras. Ensino Fís.

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Este trabalho tem como objetivo discutir de forma sucinta a ferramenta matemática conhecida como redes neurais artificiais e algumas aplicações naárea de energias renováveis. Inicialmente, o trabalho descreve a relevância desta ferramenta estatística nas diversasáreas do conhecimento e, posteriormente, conceitua e descreve as principais configurações possíveis de uma rede neural artificial. Por fim, o trabalho demonstra a aplicação da ferramenta para o levantamento de disponibilidade de recursos de energia solar no Brasil a partir de dados de superfície coletados em estações da rede SONDA operada pelo Centro de Ciência do Sistema Terrestre do Instituto Nacional de Pesquisas Espaciais. Os resultados obtidos até o momento mostram que as redes neurais podem fornecer estimativas com a confiabilidade necessária para avaliação da disponibilidade de energia solar e com melhor desempenho que outras técnicas estatísticas utilizadas na literatura. Palavras-chave: energia solar, redes neurais artificiais, modelagem atmosférica, modelos de mesoescala.This work aims at discussing the artificial neural networks (ANN) and some applications in renewable energy assessment. First, the paper describes the statistical relevance of this tool in different areas of knowledge and the main ANN concepts and configurations. Finally, the paper presents and discusses the use of ANN for the solar energy assessment in Brazil by using data collected in SONDA sites operated by the Center for Earth System Science of the Brazilian Institute for Space Research. The results show that ANN can provide reliable estimates with better performance than other statistical tools.

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“…According to the biological action the following kinds of radiation can be distinguished [2][3][4][5][6][7][8][9] (figure 1):…”

Section: Biological Action Of Uvrmentioning

confidence: 99%

Semiconductor near-ultraviolet photoelectronics

Goldberg

1999

Semicond. Sci. Technol.

121

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After a brief review of classification, application and sources of near-ultraviolet (UV) radiation the methods for fabricating UV photodetectors and characteristics of the photoconductive cells, p-n junction structure and Schottky barrier photodiodes are discussed. Characteristics of some light filters used in photodetectors and measuring devices are also reported. Now Si p-n structures are commonly used but Schottky diodes based on wide-gap (GaAsP, GaP, GaN, AlGaN, SiC) semiconductors are very attractive. They are insensitive to the infrared radiation and if necessary simple glass filters can be used for correcting the spectrum in such way that it covers just the near-UV region.

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Terrestrial Radiation: Field Characteristics

Cited by 5 publications

References 28 publications

Passive directional sub-ambient daytime radiative cooling

Passive directional sub-ambient daytime radiative cooling

Aplicações de redes neurais e previsões de disponibilidade de recursos energéticos solares

Semiconductor near-ultraviolet photoelectronics

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