Clearness index estimation for spectral composition of direct and global solar radiations

Rahoma, U. Ali

doi:10.1016/s0306-2619(00)00051-9

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…The country is in an advantageous position with solar energy (Shaltout et al [10] and Rahoma [11]). In 1991 Solar Atlas for Egypt was issued indicating that the country enjoys 2900-3200 hours of sunshine annually with annual direct normal energy density between 1970 and 3200 kWh/m 2 and technical solar-thermal electricity generating potential of 73.…”

Section: Geographic Locationmentioning

confidence: 99%

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An optimization approach of hybrid PV-wind renewable energy systems for power generation in Egypt

Rahoma¹,

Hassan²,

Abdel-Hadi³

et al. 2016

WIT Transactions on Ecology and the Environment

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Different criteria of selecting the right sizing of different components of hybrid renewable energy power plant at the most preferable economical and logistical environmental considerations are discussed. A methodology to perform the optimal sizing of an autonomous hybrid PV-wind system is discussed considering the fact that the potential of the wind and solar energy is not equal in Egypt. Optimization study of a hybrid PV/wind system is based on the availability of sunshine all over the year with global solar radiation varying from 5 to 8 kWh/m

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Section: Geographic Locationmentioning

confidence: 99%

“…6 shows the study of variation of different components of solar radiation with time (Rahoma [11]). [10], Rahoma [11]). …”

Section: Solar Energymentioning

confidence: 99%

An optimization approach of hybrid PV-wind renewable energy systems for power generation in Egypt

Rahoma¹,

Hassan²,

Abdel-Hadi³

et al. 2016

WIT Transactions on Ecology and the Environment

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“…Existing diffuse radiation models of terrain slope are of two general types, namely, isotropic models (Liu and Jordan, 1962) and anisotropic models (Hay, 1979;Hay and McKay, 1985). Anisotropic models operate under the premise of anisotropic diffuse radiation intensity; the quantity of diffuse radiation reaching the surface in areas with complex terrain depends upon the degree of terrain masking V, in addition to other factors (Li et al, 1999;Zeng et al, 2003;Li and Weng, 1988;Rahoma, 2001;Lagib et al, 1999). The quantification of diffuse radiation, Q dαβ , in areas characterized by complex terrain is presented in equation 3.…”

Section: Distributed Diffuse Solar Radiation Model Of Rugged Terrainmentioning

confidence: 99%

Influence of complex topography on global solar radiation in the Yangtze River Basin

et al. 2014

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Global solar radiation (GSR) is the most direct source and form of global energy, and calculation of its quantity is highly complex due to influences of local topography and terrain inter-shielding. Digital elevation model (DEM) data as a representation of the complex terrain and multiplicity condition produces a series of topographic factors (e.g. slope, aspect, etc.). Based on 1 km resolution DEM data, meteorological observations and NOAA-AVHRR remote sensing data, a distributed model for the calculation of GSR over rugged terrain within the Yangtze River Basin has been developed. The overarching model permits calculation of astronomical solar radiation for rugged topography and comprises a distributed direct solar radiation model, a distributed diffuse radiation model and a distributed terrain reflectance radiation model. Using the developed model, a quantitative simulation of the GSR space distribution and visualization has been undertaken, with results subsequently analyzed with respect to locality and terrain. Analyses suggest that GSR magnitude is seasonally affected, while the degree of influence was found to increase in concurrence with increasing altitude. Moreover, GSR magnitude exhibited clear spatial variation with respect to the dominant local aspect; GSR values associated with the sunny southern slopes were significantly greater than those associated with shaded slopes. Error analysis indicates a mean absolute error of 12.983 MJm-2 and a mean relative error of 3.608%, while the results based on a site authentication procedure display an absolute error of 22.621 MJm-2 and a relative error of 4.626%.

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“…27, n.1, janeiro-março, 2012, p.37-52 39 Os aerossóis afetam diretamente o balanço de radiação solar através da absorção da radiação no comprimento do ultravioleta ou da difusão e reflexão da radiação solar direta. A radiação no comprimento do ultravioleta corresponde a aproximadamente 4% da radiação solar global (ELHADIDY et al, 1990;KHOGALI & AL-BAR, 1992;ALI RAHOMA, 2001;MOSALEM SHALTOUT et al, 2001;ROOBA, 2004;ESCOBEDO et al, 2008). Indiretamente, os aerossóis influenciam o balanço de radiação alterando as propriedades físicas e o tempo de vida das nuvens (ROSENFELD, 2000;RAMANATHAN et al 2001;ACKERMAN et al, 2000;WIELICKI et al, 2005;KAUFMAN & KOREN, 2006 …”

Section: Teramoto and Escobedounclassified

Evolução Diurna E Anual Da Frequência Das Coberturas De Céu Em Botu-Catu/Sp

Teramoto¹,

Escobedo²

2012

EnergAgric

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Clearness index estimation for spectral composition of direct and global solar radiations

Cited by 6 publications

References 3 publications

An optimization approach of hybrid PV-wind renewable energy systems for power generation in Egypt

An optimization approach of hybrid PV-wind renewable energy systems for power generation in Egypt

Influence of complex topography on global solar radiation in the Yangtze River Basin

Evolução Diurna E Anual Da Frequência Das Coberturas De Céu Em Botu-Catu/Sp

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