Statistical Study Of Variation Of Diffuse Solar Radiation Over Nigeria

British Journal of Applied Science and Technology Pub Date : 2015-01-01 DOI:10.4314/JAST.V20I1-2

E. Falayi, A. Rabiu

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Abstract

Multiple regression models have been developed to study the variation of diffuse solar radiation over Nigeria using monthly mean data of clearness index, relative sunshine duration, average temperature and cloud cover. The data for eight stations representing the weather conditions of Nigeria and covering a period 16 years were analyzed, and the statistical accuracy of the regression equations were evaluated by root mean square error, stand-ard error, mean bias error, t-statistic, correlation coefficient and coefficient of determination. The regression prod-uced good correlation between the dependent variable of fraction of diffuse solar radiation and the independent variables of clearness index, relative sunshine duration, cloud cover and average temperature. The multiple regre-ssion equations reflected the spatial variability with the latitudes, and can be used for prediction of diffuse solar radiation in Nigeria. A temporal and spatial diffuse solar radiation contour map was developed using Surfer 10 Golden graphic software. Keywords: Multiple regression, Diffuse solar radiation, Clearness index, Cloud cover, Correlation coefficient

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尼日利亚上空太阳漫射辐射变化的统计研究

利用净度指数、相对日照时数、平均温度和云量的月平均数据，建立了尼日利亚上空太阳漫射辐射的多元回归模型。对尼日利亚8个气象站16年的气象数据进行分析，通过均方根误差、标准误差、平均偏倚误差、t统计量、相关系数和决定系数对回归方程的统计精度进行评价。回归结果表明，太阳漫射辐射分值因变量与晴度指数、相对日照时数、云量、平均气温等自变量具有较好的相关性。多元回归方程反映了不同纬度的空间变异性，可用于尼日利亚散射太阳辐射的预测。利用Surfer 10 Golden图形软件绘制了一个时空漫射太阳辐射等高线图。关键词:多元回归，漫射太阳辐射，晴空指数，云量，相关系数

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British Journal of Applied Science and Technology

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