Global and diffuse solar irradiance in Yemen (Y.A.R.)

Khogali, A.; Ramadan, M.R.I.; Ali, Zomoroudian; Fattah, Y.A.

doi:10.1016/0038-092x(83)90033-6

Cited by 76 publications

(12 citation statements)

References 12 publications

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“…Some of the systems such as concentrating systems require information on direct beam component whereas in the case of tilted plain surfaces the diffuse component of solar irradiance is also important for the computation of system performance [2]. However, at locations on the Earth's surface, the solar radiation is also a function of such variables as the nature and extent of cloud cover, the aerosol and water vapour content of atmosphere, etc.…”

Section: Introductionmentioning

confidence: 99%

Estimation of global solar radiation using clear sky radiation in Yemen

Khan¹,

Ahmad²

2012

JESTR

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In this communication, the usability of clear sky radiation for predicting the average global solar radiation has been investigated. For this aim, the various regression analyses were applied by using S/S o and S/S nh parameters. Also, equations which represent the two periods of the year, winter and summer, were developed by using these parameters. The equations developed by using S/S o and S/S nh have approximately the same results. Having the better values of the equations developed by using the change of summer and winter is another result. In addition, the use of the RMSE and MBE in isolation is not an adequate indicator of model performance. Using the t-statistic method and the harmony of results obtained with each method prove that the results are reliable.

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Section: Introductionmentioning

confidence: 99%

Estimation of global solar radiation using clear sky radiation in Yemen

Khan¹,

Ahmad²

2012

JESTR

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“…Figure 3 shows the third-order polynomial relationship between the monthly average values of (H/H ) and (S/S ). The results of the present models are compared with the values calculated from the literature correlations as tabulated in Tables IVa and IVb and the (a) Among the linear models, Equation (14) proposed by Ulgen and Ozbalta (1999) gives the best results for the test methods of MBE and RMSE, while Equation (13c) by Kholagi et al (1983) for that of the test method of MPE. In the case of the R test method, all linear models are found to give good results.…”

Section: Resultsmentioning

confidence: 97%

“…Page (1961) and Luhanga and Andringa (1990) derived their own linear models by taking into account regional values as follows: Kholagi et al (1983) developed the following equations from the experimental data measured at three di!erent stations in Yemen:…”

Section: Group I (Linear Models)mentioning

confidence: 99%

Comparison of solar radiation correlations for ?zmir, Turkey

Ülgen

Hepbaşlı

2002

Int. J. Energy Res.

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SUMMARYIn this study, empirical correlations are developed to estimate the monthly average daily global solar radiation on a horizontal surface (H) for the city of Izmir in Turkey. Experimental data were measured in the Solar}Meteorological Station of the Solar Energy Institute at Ege University. The present models are then compared with the 25 models available in the literature for calculating H based on the main percentage error, root mean error, the main bias error, and correlation coe$cient. It can be concluded that the present models predict the values of H for Izmir better than other available models.

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“…Hence, simple correlations have been developed to predict the diffuse radiation from other measured climatic data at different locations (Tasdemiroglu and Sever, 1991). In this topic, studies have been made by many researchers and the empirical formula related to different parameters are obtained (Iqbal, 1978;Orgill and Hollands, 1977;Collares-Pereira and Rabl, 1979;Modi and Sukhatme, 1979;Lewis, 1983;Khogali et al, 1983;Vignola and McDaniels, 1984;Rao et al, 1984;Ibrahim, 1985;Alnaser, 1989;Gopinathan and Soler, 1995;Aras et al, 2006;Ulgen and Hepbasli, 2009;Kaygusuz, 1999;Tiris et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

The Calculation of Diffuse Radiation on a Horizontal Surface for Solar Energy Applications

Bakırcı

2012

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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To analyze the systems working with solar energy, it is required that values of the solar radiation belonging to the region have been known. The global solar radiation on a horizontal surface has been measured by the Turkish State Meteorological Service over all of the country, while the diffuse solar radiation has not been measured. In this study, empirical correlations are developed to establish a relationship between the monthly average daily diffuse fraction (H d /H) and monthly average daily diffuse coefficient (H d /H o ) with the monthly average daily clearness index (K T D H /H o ) for the province of Erzurum, Turkey. The six new models for estimating the monthly average daily diffuse solar radiation on a horizontal surface for Erzurum are validated, and the new models are then compared with the 10 models available in the literature. In order to indicate the performance of the models, the statistical test methods of relative percentage error, mean bias error, mean absolute bias error, mean relative error, root mean square error, and correlation coefficient are used. The results indicated that the correlations developed in the study predict diffuse solar radiation reasonably well for future projections.

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Global and diffuse solar irradiance in Yemen (Y.A.R.)

Cited by 76 publications

References 12 publications

Estimation of global solar radiation using clear sky radiation in Yemen

Estimation of global solar radiation using clear sky radiation in Yemen

Comparison of solar radiation correlations for ?zmir, Turkey

The Calculation of Diffuse Radiation on a Horizontal Surface for Solar Energy Applications

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