Transmittance index characterization at two solar measurement stations in Brazil

Relva, Stefania Gomes; Gimenes, André Luiz Veiga; Udaeta, Miguel Edgar Morales; Galvão, Luiz Cláudio Ribeiro

doi:10.1007/s00704-019-02941-6

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…These consecutive days were chosen because they have a high frequency of temperature and radiation. This condition occurs because the month of September, mainly the first fortnight, in this region presents high insolation rate, small cloud cover, low humidity, low precipitation, and average daily temperatures above 23 • C [73]. In addition, the average amount of clouds at the site decreased from sunrise until around 11 a.m., subsequently presenting a monotonic increase until sunset, when it reaches the highest cloud cover [74], positively affecting the incidence of solar radiation in the PV modules.…”

Section: Pre-operation Of the Odtu Water-filmmentioning

confidence: 99%

A Long-Term Analysis of the Architecture and Operation of Water Film Cooling System for Commercial PV Modules

et al. 2021

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This work aims at analyzing and architecting natural and artificial parameters to model a water-film cooling system for photovoltaic modules for some months under warm conditions. Methodologically, the theoretical and technical aspects were structured to develop, implement, monitor, and assess the cooling system at an on-grid, outdoor testing unit, considering the following: (i) the criteria to select and to approve the implementation site (infrastructure and climatologic and solarimetric conditions); (ii) the types, frequency and qualities of the monitored data; (iii) the system measurement, monitoring and control equipment; (iv) the commissioning of the system as a whole; and (v) the tests and results empirically obtained. The water-film cooling system reduces the temperature by 15–19%, on average, and up to a maximum of 24–35%. In terms of electric power, there was an average gain of 5–9% at the time of day with the highest solar radiation, and maximum gains of 12% on days with solar radiation above average. Regarding gross energy, average gains of 2.3–6%, and maximum gains of 6.3–12%, were obtained. It was concluded that the test unit helps understand the natural phenomena and the development, operation, and maintenance of performance gain systems of on-grid PV modules for construction on a commercial scale.

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Section: Pre-operation Of the Odtu Water-filmmentioning

confidence: 99%

A Long-Term Analysis of the Architecture and Operation of Water Film Cooling System for Commercial PV Modules

et al. 2021

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“…The inherent variability witnessed in direct normal irradiance (DNI) has the potential to impart a level of uncertainty that permeates concentrated solar power (CSP) systems, thereby engendering intricate challenges that bear direct implications for the robustness of their operational integrity. In the context of a burgeoning demand for renewable energy sources, the task of proficiently overseeing the fluctuations in resource availability within power grid operations assumes a heightened degree of complexity [6]. Consequently, accurate DNI prediction is crucial for the safe and stable operation of CSP stations and remains an important issue to be solved [7].…”

Section: Introductionmentioning

confidence: 99%

Mixed Multi-Pattern Regression for DNI Prediction in Arid Desert Areas

Han,

Wang,

Wang

et al. 2023

Sustainability

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As a crucial issue in renewable energy, accurate prediction of direct normal solar irradiance (DNI) is essential for the stable operation of concentrated solar power (CSP) stations, especially for those in arid desert areas. In this study, in order to fully explore the laws of climate change and assess the solar resources in arid desert areas, we have proposed a mixed multi-pattern regression model (MMP) for short-term DNI prediction using prior knowledge provided by the clear-sky solar irradiance (CSI) model and time series patterns of key meteorological factors mined using PR-DTW on different time scales. The contrastive experimental results demonstrated that MMP can outperform existing DNI prediction models in terms of three recognized statistical metrics. To address the challenge of limited data in arid desert areas, we presented the T-MMP model involving combined transfer learning and MMP. The experimental results demonstrated that T-MMP outperformed MMP in DNI prediction by exploiting the significant correlation between meteorological time series patterns in similar areas for data augmentation. Our study provided a valuable prediction model for accurate DNI prediction in arid desert areas, facilitating the economical and stable operation of CSP plants.

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“…The solar radiation that reaches the Earth's surface on the horizontal plane is called global radiation and can be divided into direct and diffuse components. Solar radiation is subject to atmospheric attenuation by reflection, absorption, and diffusion due to the interaction of electromagnetic waves with the constituent gases of the atmosphere, clouds and aerosols, which makes it difficult to predict (SOUZA; ESCOBEDO, 2013;RELVA et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Radiação global e difusa diária na região de transição Cerrado-Amazônia brasileira

Zamadei

Souza

Almeida

et al. 2021

CeN

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This study aimed to analyze the seasonal variations in atmospheric transmissivity and solar radiation (global and diffuse) on the horizontal surface in Sinop, Mato Grosso (MT) (11.865°S, 55.485°W, and altitude of 371 m) from 06/02/2011 to 12/31/2014. The values of diffuse radiation were measured using the Melo-Escobedo-Oliveira (MEO) shadow ring, with application of astronomical, geometric, and anisotropic correction factors. The analysis of atmospheric transmissivity was based on the classification of sky cover as cloudy, partly cloudy, partially clear, or clear. The diffuse radiation showed similar behavior to the radiation at the top of the atmosphere, reaching a maximum between October and April (rainy season), while the global radiation displayed higher levels during the dry season (May to September). The average daily global radiation ranged from 22.75±0.61 MJ m−2 d−1 in August to 16.44±1.45 MJ m−2 d−1 in January. In Sinop, cloudy and partly cloudy skies occurred on 45.6% of days and atmospheric transmissivity of global radiation was greater than 55% on 54.6% of days. The variations in diffuse radiation in the region were influenced by cloudiness and the concentration of biomass burning aerosol particles. The diffuse radiation can represent 8.02%–99.12% of the global radiation and 5.33%–29.01% of solar energy incident at the top of the atmosphere.

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Transmittance index characterization at two solar measurement stations in Brazil

Cited by 4 publications

References 19 publications

A Long-Term Analysis of the Architecture and Operation of Water Film Cooling System for Commercial PV Modules

A Long-Term Analysis of the Architecture and Operation of Water Film Cooling System for Commercial PV Modules

Mixed Multi-Pattern Regression for DNI Prediction in Arid Desert Areas

Radiação global e difusa diária na região de transição Cerrado-Amazônia brasileira

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