Construction of a quadratic model using modified Ångstrom coefficients to estimate global solar radiation

Akinoglu, Bülent G.; Ecevit, A.

doi:10.1016/0038-092x(90)90032-8

Cited by 157 publications

(49 citation statements)

References 27 publications

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“…4°46′N, long. 7°10′E), a tropical location [5].. Ogelman et al (1984) model, Akinoglu and Fagbenle's (1990) model were compared with the ones developed for the Nigerian environment [5][6][7]. The results showed that the relationship between clearness index and relative shine in quadratic form is to some extent locality dependent.…”

Section: Background Of the Studymentioning

confidence: 99%

Performance Assessment Of Hargreaves Model In Estimating Global Solar Radiation In Sokoto, Nigeria.

2017

IJASRE

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BACKGROUND OF THE STUDYIn many applications of solar energy, the most important parameters that are often needed are the average global solar irradiation and its components. Unfortunately, the measurements of these parameters are done only at a few places. For this reason there have been attempts at estimating them from theoretical models. Latha et al., mentioned that these equations range from the most complex energy balance equations requiring detailed climatological data to simpler equations requiring limited data such as Hargreaves-Samani model [1][2]. Hargreaves-Samani's is widely used because it requires only input variable of minimum and maximum air temperatures and many researchers accepted that its GSR estimates correlate well with observed values in many locations [3].The extraterrestrial solar radiation is the rate at which solar energy arrives on a horizontal surface at the top of the atmosphere. It varies according to the latitude of the location, the distance of the Earth from the Sun, and the time of the year. On any particular day, it varies from zero at sunrise to a maximum at noon and back zero at sunset [4].Despite the large range of applications demanding solar radiation data, direct measurements of solar energy are not available. Thus use of numerical techniques becomes essential. With such indirect techniques, other meteorological parameters are mathematically exploited in order to estimate the amount of solar radiation reaching the earth surface.The estimation of daily global solar radiation has been reviewed in most of the researches based on the duration of sunshine, identifying the best model and determining different coefficients for several locations. There are several types of models (linear,

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Section: Background Of the Studymentioning

confidence: 99%

Performance Assessment Of Hargreaves Model In Estimating Global Solar Radiation In Sokoto, Nigeria.

2017

IJASRE

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“…The first Sunshine duration model was proposed by Angstrom [11], which related the clear sky index with the sunshine duration fraction by using the linear equation. Some researchers have done a large number of modifications on these models to improve the accuracy [12]. These models are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Estimation of Solar Radiation Model Using Measured Data in a Specific Region

Yanıktepe¹,

Kara²,

Özalp³

2017

RAD Conference Proceedings

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“…(1) we consider sunshine duration as representative of the 15th day of each month and we use corresponding values (Rietveld, 1978;Landsberg, 1981;Andretta et al, 1982;Iqbal, 1983;Newland, 1989;Gopinathan and Soler, 1995;Akinoglu and Ecevit, 1990;Coppolino, 1994) were tested. The errors turned however out to be larger than the ones obtained with the coefficients tuned on Italian data and so we prefer using these coefficients.…”

Section: Converting Sunshine Duration To Global Radiationmentioning

confidence: 99%

1961–1990 monthly high-resolution solar radiation climatologies for Italy

et al. 2012

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Abstract. We present a methodology for estimating solar radiation climatologies from a sparse network of global radiation and/or sunshine duration records: it allows to obtain high-resolution grids of monthly normal values for global radiation (and for the direct and diffuse components), atmospheric turbidity, and surface absorbed radiation. We discuss the application of the methodology to a preliminary version of an Italian global radiation and sunshine duration data set, which completion is still in progress and present the resulting 1961-1990 monthly radiation climatologies.

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Construction of a quadratic model using modified Ångstrom coefficients to estimate global solar radiation

Cited by 157 publications

References 27 publications

Performance Assessment Of Hargreaves Model In Estimating Global Solar Radiation In Sokoto, Nigeria.

Performance Assessment Of Hargreaves Model In Estimating Global Solar Radiation In Sokoto, Nigeria.

Estimation of Solar Radiation Model Using Measured Data in a Specific Region

1961–1990 monthly high-resolution solar radiation climatologies for Italy

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