Correlation for the Average Daily Diffuse Fraction with Clearness Index and Estimation of Beam Solar Radiation and Possible Sunshine Hours Fraction in Sabha, Ghdames and Tripoli - Libya

Ahwide, Farag; Spena, A; El-Kafrawy, Aly

doi:10.1016/j.apcbee.2013.05.037

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…Accordingly, Figure 5a, b, c explains the daily global solar radiations in relation to the direct and diffuse radiations. Moreover, for more detailed knowledge, it is highly recommended to refer to the work that was already attempted by F. Ahwide et al [13].…”

Section: Resultsmentioning

confidence: 99%

Prediction and Assessment of Direct and Diffse Radiation Fractions for Hourly, Daily and Monthly Average Global Radiation at Diffrent Latitude Locations in Libya

Ahwide

2017

jsesd

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As in today´s world, the dramatic increase in world’s population, the rapid depleting of conventional fuels (Fossil Fuels) as well as the environmental impact have lef us no choice but to discover alternative energy sources. In fact, this would ensure a better and safer life on this earth and this will only be accomplished by using the best option of nonconventional and non-exhaustible sources of energy, which is the solar energy. Th current study is aimed at evaluating the availability and potentiality of direct and diffsesolar radiations in three diffrent locations in Libya within diffrent latitudes. Thee diffrent locations with diffrent values of measured daily solar radiation are opted for comparison purposes. This daily solar radiation data are used to create an hourly database of solar radiation. Th mathematical framework for the prediction and assessment has been chosen to be the Microsof Excel. The resultant monthly, daily and hourly diffse fraction relative to their clearance indexes have been in very good agreement with existing research. Moreover, one of the main fidings of this attempt is that this study has claimed and justifid the usefulness of direct radiation in operating the concentrating solar power (CSP) plants, attributed to its overall magnitude of approximately 75% of the global radiation, particularly at the summer season.

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Section: Resultsmentioning

confidence: 99%

Prediction and Assessment of Direct and Diffse Radiation Fractions for Hourly, Daily and Monthly Average Global Radiation at Diffrent Latitude Locations in Libya

Ahwide

2017

jsesd

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“…The results have ratified the conclusions obtained by other authors on the non-universal character of Liu and Jordan cumulative distribution function. Ahwide et al [14] have established a relationship between daily diffuse fraction and daily clearness index by using daily global solar radiation data obtained from three Libyan locations and calculated values of daily clearness index were used to find the frequency of occurrence of days with different values of clearness index and cumulative frequency of occurrence of those days. Hassan [15] has developed empirical equation for monthly mean daily global and diffuse solar radiation by using three year measurements of meteorological data in Mosul and also ARIMA (2,1,1) has been developed for prediction of clearness index.…”

Section: Introductionmentioning

confidence: 99%

Analysis of ratio of global to extra-terrestrial radiation (clearness index) at some tropical locations in India

Ravichandran¹,

Rathnaraj²

2017

THERM SCI

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An attempt has been made to analyze and evaluate the daily average clearness index (H g /H 0 ) in terms of daily average cloudiness index (H d /H 0 ) for three tropical locations in South India (Chennai, Trivandrum, and Visakapatnam). Long term data (15 years, 1993-2007) of measured daily average global and diffuse solar radiation for the locations have been used for this study. Two correlation equations (linear and polynomial) for each location have been developed for clearness index in terms of cloudiness index and found its validity. Performance statistics of the model has been done and applicability of the model is done by comparing the performance statistics with the existing models. It has been found that the proposed model has least error compared with the existing models.

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“…35-44 función de otros parámetros como las horas de sol, nubosidad, entre otros parámetros meteorológicos [13]. No obstante, la utilización de modelos estadísticos está siendo empleada en los últimos años [14]- [16]; uno de los modelos iniciales es el de regresión de Angström. Investigaciones como las de [17]- [19] afirman que Angström propuso una relación lineal entre la proporción global de irradiación (H/H0) para la radiación global en días despejados y la proporción de las horas del sol (S/S0) para la duración astronómica del día.…”

Section: Introductionunclassified

Evaluación de un modelo estadístico para estimar la radiación solar en Magdalena, Colombia

Vélez-Pereira

Vergara-Vásquez

Barraza-Coronell

et al. 2015

TecnoL.

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Correlation for the Average Daily Diffuse Fraction with Clearness Index and Estimation of Beam Solar Radiation and Possible Sunshine Hours Fraction in Sabha, Ghdames and Tripoli - Libya

Cited by 9 publications

References 3 publications

Prediction and Assessment of Direct and Diffse Radiation Fractions for Hourly, Daily and Monthly Average Global Radiation at Diffrent Latitude Locations in Libya

Prediction and Assessment of Direct and Diffse Radiation Fractions for Hourly, Daily and Monthly Average Global Radiation at Diffrent Latitude Locations in Libya

Analysis of ratio of global to extra-terrestrial radiation (clearness index) at some tropical locations in India

Evaluación de un modelo estadístico para estimar la radiación solar en Magdalena, Colombia

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