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Journal ArticleDOI

Emperical Computation of Solar Radiation and Determination of Regression Coefficients for Khulna City

01 Dec 2014-Indonesian Journal of Electrical Engineering and Computer Science (Institute of Advanced Engineering and Science)-Vol. 12, Iss: 12, pp 8015-8021

AbstractThis study is accomplished to calculate global, diffuse and direct solar radiation empirically on a horizontal surface for the divisional district “Khulna” in Bangladesh (latitude 22o47΄N and longitude 89o34΄E) as well as to predict correlations for it by using several meteorological data for 32 years between 1980 and 2012. The global radiation is found to be maximum in the month of April and minimum in the month of December here. The estimated values of the Angstrom’s regression constants a and b are 0.2388 and 0.5228 respectively. The other regression constants were also computed and the correlations proposed for Khulna can be used in future for the estimation of global, diffuse and direct solar radiation if the meteorological parameters remain available.

Topics: Latitude (50%)

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1,172 citations


Journal ArticleDOI
Abstract: The solar radiation prediction in Kuala Terengganu located in Terengganu, Malaysia was investigated in this study to improve the solar system design. Solar radiation data and number of parameters such as solar radiation, temperature, humidity, wind speed and sunshine hours were obtained from Malaysian Meteorological Malaysia MMD. In order to predict the solar radiation, Genetic Programming Techniques (GP) models were develop and tested. Two scenarios were considered in this study in order to validate the efficiency of the proposed model. Coefficients of determination (R2) for the solar radiation during training and testing phases were ranged between 0.99402 to 0.98934 for all months of the year. This study confirms the ability of GP to predict solar radiation values precisely and accurately. The predictions from the GP models could enable scientists to locate and design solar energy systems in Malaysia.

1 citations


References
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Journal ArticleDOI
Abstract: Based upon the data now available, this paper presents relationships permitting the determination on a horizontal surface of the instantaneous intensity of diffuse radiation on clear days, the long term average hourly and daily sums of diffuse radiation, and the daily sums of diffuse radiation for various categories of days of differing degrees of cloudiness. For these determinations, it is necessary to have, either from actual measurements or estimates, a knowledge of the total (direct plus diffuse) radiation on a horizontal surface-its measurement is now regularly made at 98 localities in the United States and Canada. For localities where only an estimate of the long term average total radiation is available, relationships presented in this paper can be utilized to determine the statistical distribution of the daily total radiation at these localities.

2,096 citations


"Emperical Computation of Solar Radi..." refers background in this paper

  • ...Estimation of Radiation Many researchers throughout the world have estimated the values of solar radiation and its components for different areas of the world utilizing different formulas [2-12]....

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Journal ArticleDOI

1,172 citations


Journal ArticleDOI
Abstract: Solar radiation data are required by solar engineers, architects, agriculturists and hydrologists for many applications such as solar heating, cooking, drying and interior illumination of buildings. In order to achieve this, several empirical models have been developed to predicted the solar radiation all over the world. The main objective of this study is to review the global solar radiation models available in the literature. In order to evaluate the applicability of 50 models for computing the monthly average daily global radiation on a horizontal surface, the geographical and meteorological data of Konya, Turkey (37°52′N latitude, 32°29′E longitude) was used. The models were compared on the basis of statistical error tests such as the percentage error (e), mean percentage error (MPE), root mean square error (RMSE), mean bias error (MBE), regression coefficient (R) and Nash–Sutcliffe equation (NSE). According to the results, the Ertekin and Yaldiz model showed the best estimation of the global solar radiation on a horizontal surface for Konya, Turkey, by means of the MPE (0.004266%), RMSE (0.022576 MJ/m2), MBE (0.000000 MJ/m2), R (0.999993) and NSE (0.999985) statistical tests: H = 20.296019 - 0.096134 H 0 + 0.317593 δ - 0.146422 RH + 10.705159 S S 0 - 0.288332 T + 0.021331 TS + 0.359791 C + 0.207588 P - 0.076444 E

130 citations


"Emperical Computation of Solar Radi..." refers background in this paper

  • ...Estimation of Radiation Many researchers throughout the world have estimated the values of solar radiation and its components for different areas of the world utilizing different formulas [2-12]....

    [...]


Journal ArticleDOI
Abstract: In this study, daily global radiation for Toledo (39°53′05″N, 4°02′58″W, Spain) were utilized to determine monthly-specific equations for estimating global solar radiation from sunshine hours and to obtain improved fits to monthly Angstrom–Prescott's coefficients. Models were compared using the root mean square error (RMSE), the mean bias error (MBE) and the t -statistic. According to our results, all the models fitted the data adequately and can be used to estimate the specific monthly global solar radiation. Average RMSE and MBE for comparison between observed and estimated global radiation were 1.260 and −0.002 MJ m −2 day −1 , respectively. The t -statistic was used as the best indicator, this indicator depends on both, and is more effective for determining the model performance. The agreement between the estimated and the measured data were remarkable and the method was recommended for use in Toledo (Spain).

127 citations


"Emperical Computation of Solar Radi..." refers background in this paper

  • ...Estimation of Radiation Many researchers throughout the world have estimated the values of solar radiation and its components for different areas of the world utilizing different formulas [2-12]....

    [...]


Journal ArticleDOI
Abstract: Following Garg and Garg, atmospheric water vapour content or specific humidity Wat is used along with sunshine duration to obtain a relation to estimate the global irradiation G using data for stations near sea level only of north and central India. The method is extended to find D, the diffuse irradiation. The resulting equations are G = G 0 (0.394+0.364 n/N′−0.0035 W at ) D = G 0 (0.306+0.165 n/N′+0.0025 W at ) where N′ is the maximum duration for which the Campbell-Stokes sunshine recorder is active and G0 is the extraterrestrial irradiation. The deviations are compared to those obtained by Mani and Rangarajan using Hay's formulae for G and D and also to those obtained by Garg and Garg for G.

54 citations


"Emperical Computation of Solar Radi..." refers methods in this paper

  • ...Hussain [14] is used given by Equation (2)....

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