The Study of Terrestrial Solar Radiation in Awka Using Measured Meteorological Data (original) (raw)

Diurnal and Seasonal Variation of Global Solar Radiation at Anyigba, North-Central Nigeria

The seasonal and diurnal variations of solar radiation have been studied by analyzing two years data measured at the ground surface in a tropical wet and dry climatic region and the guinea savanna station Anyigba (7.486N, 7.1836E), in Nigeria using Campbell automatic weather station. The analysis was carried out over two years with each year divided into four seasons (vernal equinox (March), summer solstice (June), autumn equinox (September) and winter solstice (December)). Results obtained shows diurnal variation of solar radiation of varying degree and pattern over the four seasons. The results showed that the surface temperature is not a direct measurement of sun temperature on earth but rather a measure of the atmospheric response to solar radiation. The comparison of solar radiation measured during the two seasons that coincided with rainy period in the study area shows that the measured solar radiation tends to be lower during this period for the year 2012 than 2011. This observation was attributed to higher rainfall in 2012. Keywords: Solar radiation,

Variation of Solar Radiation in Akwanga, Nasarawa State, Nigeria

Journal of Energy Research and Reviews

One of the major environmental problem is the long-term changes in the Earth’s climate. In this study, the variation of solar radiation for Akwanga zone, Nasarawa State, Nigeria were determined. Twelve locations were carefully selected where there is no sunshine and wind obstruction. Three 12V, 5W Solar panels (poly) were used and a three-hour daily measurement interval (12.00 pm to 3.00 pm) was made using the Secondary Standard Pyranometer placed on the top of the panels. Angstrom-Prescott Regression Equation was used to estimate the output. The continuity in the assembled system was measured using an Avometer. The result revealed that the highest monthly average daily global solar radiation was observed in the month of April (25.2 MJ/m2) followed by June (22.94 MJ/m2), and march (22.42 MJ/m2), while the lowest was observed in the month of August (12.04 MJ/m2) followed by July (13.57 MJ/m2), and September (14.26 MJ/m2) in the locations selected. The solar radiation intensity was fo...

Analysis of Global Solar Irradiance over Climatic Zones in Nigeria for Solar Energy Applications

Journal of Solar Energy, 2015

Satellite derived solar irradiance over 25 locations in the 5 climatic zones of Nigeria (tropical rainforest TRF, Guinea savannah GS, Sahel savannah SHS, Sudan savannah SUS, and Mangrove swamp forest MSF) was analyzed. To justify its use, the satellite data was tested for goodness of agreement with ground measured solar radiation data using 26-year mean monthly and daily data over 16 locations in the 5 climatic zones. The well-knownR2, RMSE, MBE, and MPE statistical tests were used and good agreement was found. The 25 locations were grouped into the 5 climatic zones. Frequency distribution of global solar irradiance was done for each of the climatic zones. This showed that 46.88%, and 40.6% of the number of days (9794) over TRF and MSF, respectively, had irradiation within the range of 15.01–20.01 MJ/m2/day. For the GS, SHS, and SUS, 46.19%, 55.84% and 58.53% of the days had total irradiation within the range of 20.01–25.01 MJ/m2/day, respectively. Generally, in all the climatic zon...

Solar Radiation Evaluation in North-East Geo-Political Zone of Nigeria

Iconic Research And Engineering Journals, 2022

Sky condition evaluation in northeast geopolitical zone of Nigeria has been carried out in this paper. Twenty years (2000-2020) data of daily global solar radiation and monthly average bright sunshine hours are sourced from National Aeronautics and Space Administration (NASA) and Nigeria Meteorological Agency (NIMET), respectively. The zone consists of six states. Total average global solar radiation on horizontal surface of 69.05 kWhrm-2 day-1 is estimated for the zone. Monthly average clearness index ranges from 0.42-0.69. These depict that cloudy sky condition is prevalent in northeast of Nigeria. A monthly bright sunshine hour of the geopolitical zone is estimated at 94.16 hrs. Five (5) seasonal classification periods are recorded in Bauchi, Damaturu and Yola. In Gombe and Maidugri, six seasonal classification periods were observed. While in Jalingo, seven seasonal periods were identified. Coefficients of determination are estimated for Angstrom-Page equation for the study locations and zone.

The Influence of Some Meteorological parameters on Solar Radiation in Yola, Adamawa State, Nigeria

A study was carried out to estimate the global solar radiation in Yola, North Eastern, Nigeria (Latitude 09.14 0 N, Longitude 12.28 0 E and altitude 186.1 m above sea level) in order to examine the impact of cloud cover, relative humidity, rainfall, minimum and maximum temperature and the daily values of global solar radiation, using different proposed empirical models for a period of 15 years (2001-2015). The values of the measured and the estimated global solar radiation models were tested using the Root Mean Square Error (RMSE), the Mean Bias Error (MBE) and the Mean Percentage Error (MPE) were also calculated. From the results obtained, the equation (Model 4) () () () () outperformed the rest based on statistical analysis. The results obtained show a remarkable agreement between the measured and the predicted values using the model. This model is recommended for designers and engineers of solar energy and other renewable energy devices in this area.

Determination of the Daily and Weekly Solar Radiation of September 2015 at Presco Campus Ebonyi State University, Abakiliki-Nigeria

Research Journal of Applied Sciences, Engineering and Technology, 2017

This study focused on the measurement of global solar radiation at the Presco Campus of Ebonyi State University, Abakaliki-Nigeria (06°N, 08°E, 43.9 m) in the month of September, 2015. The variability in global solar radiation was measured using a daystar meter on 30 min, hourly, daily, weekly and monthly scales. GPS global positioning instrument No. 13467763 was also used in determining the elevation and position of the area where the experiment was carried out. The results showed that the peak of the hourly average global insolation was 2.25 W/m2. In a clear partially bright sunny day, the daily average of global solar radiation was 627.44 W/m2 while the daily average of irradiation on a cloudy day was 384.19 W/m2. On a weekly scale, the average irradiation was 2.95 W/m2 whereas on a monthly scale, the average was 11.79 KW/m2 for the month of September, 2015.

Predicted and Measured Global Solar Radiation in Maiduguri, Nigeria

Iconic Research and Engineering Journals, 2020

A model for estimating sunshine hours from some meteorological parameters was developed. Ten years (2001-2010) period of Sunshine hour and Solar radiation at Maiduguri, Nigeria (11.85 o N, longitude is 13.08°E) was analyzed. A correlation equation of the Angstrom type was developed to predict the monthly mean daily global solar radiation incident on a horizontal surface in Maiduguri, Nigeria: ̅ ̅ =. +. ̅ ̅. The statistical error estimations such as RMSE, MPE and MBE used to test the correlation between the measured global solar radiation and the calculated global solar radiation. The RMSE was found to be 0.05 as low as expected, the MBE was also found to be 0.015 and MPE to be 0.062 values are low. The developed model can be used in estimating global solar radiation for Port Harcourt and other locations with similar climatic conditions.

Evaluation of horizontal surface solar radiation levels in southern Nigeria

Journal of Renewable and Sustainable Energy, 2011

Solar energy, which is inexhaustible and abundant, has become an economically viable and environmentally preferable alternative to fossil fuels. There is the inherent advantage of solar energy in mitigation of climate change, generation of employment, and reduction of poverty, as well as increased energy security and supply. It is therefore important to continue to evaluate the global solar radiation levels in countries such as Nigeria with considerably high solar energy potential. In this paper, we report such evaluation for southern Nigeria; in particular, the correlations of meteorological estimates from National Aeronautics and Space Administration ͑NASA͒ and calculated Hargreaves estimates for this region of Nigeria ͑latitude of 4.75°-7.77°N and longitude of 3.33°-8.32°E͒ are carried out and the results show a good agreement in all the sites, thereby strengthening the case we make for decentralized renewable energy investments in the region.

Estimation of Global Solar Radiation and Its Derivatives at Nguru, Nigeria

African Review of Physics, 2017

The estimation of global solar radiation at Nguru, latitude12°53'N, 10°28'E was carried out. The data was obtained from Nigeria Meteorological Agency (NIMET) for a period of five years (2004-2008).The minimum temperature, maximum temperature and relative humidity data within the S udan savannah climatic zone of northern Nigeria wer e used to compute the correlation coefficients (a&b) of correlation e quations as -0.143+1.183 (Tmin/Tmax) and 0.563-0.00 3( RH)for estimation of global solar radiation using ratio of minimum temperature to maximum temperature and rel ativ humidity respectively, with the values of 26.02MJday -1 nd 25.85 MJday ,as the peak values of the global solar radiation ( H), corresponding to the months of April and October re spectively in the station and hence its derivatives w re also derived.

Statistical Analysis and Distribution of Global Solar Radiation and Temperature Over Southern Nigeria

Journal of the Nigerian Society of Physical Sciences

The intensity of solar energy that is received by a particular location is affected by most meteorological conditions including, the solar irradiance received by the location, precipitation, extreme heat as a result of the surface or ambient temperature, etc. We obtain the monthly global solar irradiation and ambient temperature for the three (3) eco-climatic zones in the south of Nigeria (17 locations) for 12 years (2005 - 2016) from the Photovoltaic Geographical Information System (PVGIS) Satellite. The goal of this study is to understand how regional meteorological conditions affect radiation and temperature reception. Monthly and annual trends were plotted and compared for both variables in each region to show the similarity or dichotomy in their trends. The Mann-Kendall (M-K) trend test has been adopted to reveal that the changes in the variations on an annual basis, and results showed that the trend were not significant for both variables. Box plots have been used to give a be...