Empirical models for predicting global solar radiation using  meteorological parameters for Sokoto, Nigeria

Akpootu, D. O.; Tijjani, Bashir; Gana, Usman M.

doi:10.14419/ijpr.v7i2.29160

Cited by 7 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where Isc is the solar constant numerically given to be 1367 Wm -2 , 𝜑 is the location's latitude, 𝛿 is the solar declination and 𝜔 𝑆 is the mean sunrise hour angle for the given month and 𝑛 is the number of days of the year which begins from 1 st of January to 31 st of December. The solar declination and the mean sunrise hour angle was computed using the following equations [18] as reported in [19][20][21][22][23][24][25][26].…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Earth’s Albedo Using Meteorological Parameters over Maiduguri, Nigeria

Akpootu,

Argungu,

Umar

et al. 2023

AJR2P

View full text Add to dashboard Cite

The present study estimate and investigate the variation of albedo for Maiduguri situated in the Sahelian region of Nigeria, using meteorological data of global solar radiation obtained from the National Aeronautics and Space Administration (NASA) extending for a period between 1984 to 2021. Investigation was carried out on the variation of albedo with surface temperature, maximum wavelength, clearness index, global solar radiation, relative humidity and mean temperature. The study found that the estimated surface albedo exhibited a direct opposite relationship with the clearness index, an inverse relationship with the emitting Earth’s surface temperature and a direct relationship with the wavelength for the location. The highest value of 0.5125 and lowest value of 0.3344 were found in August and November respectively. The emitting Earth surface temperature ranged between 232.8674 K in August and 251.7177 K in November. This is in agreement with the standard emitting Earth surface temperature (255.0000 K). The values of the maximum emitting wavelength were found to be > 4 indicating longwave radiation which is within the infrared region of the electromagnetic spectrum. The results from this study will be useful for the design of solar energy collectors and researches on atmospheric radiative transfer.

show abstract

Section: Methodsmentioning

confidence: 99%

Investigation of the Earth’s Albedo Using Meteorological Parameters over Maiduguri, Nigeria

Akpootu,

Argungu,

Umar

et al. 2023

AJR2P

View full text Add to dashboard Cite

show abstract

“…As derived from equations ( 24), (25), and (26), the variables (Akpootu et al, 2023). According to Merges et al, (2006); Gana and Akpootu (2013a;; Akpootu and Gana, (2014); Akpootu and Sulu, (2015); Olomiyesan et al, (2021), for a model to perform better, a low value for MPE is desirable and the percentage error between -10 % and +10 % is considered acceptable. Also, Halouani et al, (1993); Almorox et al, (2005) and Chen et al, (2004) did recommend a zero value for MBE as ideal and a low value for RMSE as desirable.…”

Section: Developed Diffuse Solar Radiation Modelsmentioning

confidence: 99%

“…The mean daily extraterrestrial radiation on a horizontal surface, denoted by , can be estimated for each day of a month by averaging the daily values over that month (Iqbal, 1983;Zekai, 2008;Saidur et al, 2009). This calculation is based on the equations presented by Iqbal (1983) and Zekai (2008) as reported by Akpootu and Momoh (2014); n , the number of days in a year from January 1 st to December 31 st , is incorporated into the calculation. The solar declination and mean sunrise hour angle are determined using the methods presented by Iqbal (1983) and Zekai (2008) as reported by are given by:…”

Section: Introductionmentioning

confidence: 99%

New Models for Estimation of Diffuse Solar Radiation for Warri, Nigeria

Akpootu,

Salifu

2024

dujopas

View full text Add to dashboard Cite

This study utilized a 22-year dataset (2001-2022) comprising monthly average daily global solar radiation, diffuse solar radiation, relative humidity, atmospheric pressure, wind speed, and mean temperature for Warri (Latitude 5.52 oN, Longitude 5.73 oE and 6.10 m above sea level). Nineteen models, categorized into modified Page, Liu, and Jordan models; clearness index and one variable models; two variable models; three variable models; and four variable models, were developed and statistically tested using the following validation indices of Mean Bias Error (MBE), Root Mean Square Error (RMSE), Mean Percentage Error (MPE), t-test, and coefficient of determination (R2). Among the models, the linear page model from the modified Page, Liu, and Jordan category, the model that relates the diffuse solar radiation with clearness index and mean temperature for clearness index and one variable models, the model that relates wind speed and atmospheric pressure for two variable models, and the model that relates wind speed, atmospheric pressure and relative humidity for three variable models were found more appropriate. Upon ranking the best-performing models from each category, the model that relates that diffuse solar radiation with clearness index and mean temperature performed best as the most suitable model for estimating diffuse solar radiation in Warri.

show abstract

“…The magnitudes of RMSE values are useful to identify model performance but not of under or overestimation by individual model [23]. The peak value for RMSE is zero or 0.0≤ RMSE [24] is given by the equation [25][26][27][28][29][30][31][32][33]:…”

Section: Root Mean Square Error (Rmse)mentioning

confidence: 99%

A Comparative Study for Estimating Reference Evapotranspiration Models over Kano, Nigeria

Abdulsalam,

Akpootu,

Aliyu

et al. 2023

JENRR

View full text Add to dashboard Cite

The major factor faced by Agricultural activities is water scarcity. Water is very essential in Agricultural activities (plantation), crop acquires water naturally by precipitation and subsurface moisture, when the supply of water is inadequate for crop use, mostly results to irrigation. This present study estimates and compares six various universally accepted models for estimating reference evapotranspiration (ET0) for Kano situated in the Sahelian climatic zone of Nigeria using measured meteorological parameters of monthly average daily global solar radiation, sunshine hour, wind speed, minimum and maximum temperatures and relative humidity covering a period of thirty one years (1988 – 2018). Four different statistical validation indices of Root Mean Square Error (RMSE), Mean Bias Error (MBE), Mean Absolute Error (MAE) and coefficient of correlation (R) were carried out to test the accuracy of the evaluated models. The result indicated that high value of ETo was found in the month of April with 10.0256 mm/day for Kano and a low value was found to be in August with 5.0804 mm/day for Kano. The Blaney – Morin Nigeria model was found more accurate for Kano with RMSE, MBE, MAE and R values as 1.5078 mm/day, -1.4634 mm/day, 1.4634 mm/day and 0.9790 respectively.

show abstract

Empirical models for predicting global solar radiation using meteorological parameters for Sokoto, Nigeria

Cited by 7 publications

References 11 publications

Investigation of the Earth’s Albedo Using Meteorological Parameters over Maiduguri, Nigeria

Investigation of the Earth’s Albedo Using Meteorological Parameters over Maiduguri, Nigeria

New Models for Estimation of Diffuse Solar Radiation for Warri, Nigeria

A Comparative Study for Estimating Reference Evapotranspiration Models over Kano, Nigeria

Contact Info

Product

Resources

About