scholarly journals Comparative Study of Experimentally Measured and Calculated Solar Radiations for Two Sites in Algeria

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7441
Author(s):  
Bouazza Fekkak ◽  
Mustapha Merzouk ◽  
Abdallah Kouzou ◽  
Ralph Kennel ◽  
Mohamed Abdelrahem ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Comparative Study ◽  
Theoretical Models ◽  
Relative Difference ◽  
Solar Irradiation ◽  
Comparison Study ◽  
Global Solar Irradiation ◽  
Proposed Model ◽  
Different Seasons

This paper presents a comparison study between the measured solar radiations on site and the calculated solar radiation based on the most theoretical models presented in the literature up to date. Indeed, for such purposes, this paper focusses on the analysis of the data of the measured solar radiation collected on two sites in Algeria such as Tlemcen (34°52′58″ N 01°19′00″ W, elevation 842 m) and Senia (35°39′ N 0°38′ W, elevation: 77 m). In order to check the accuracy of the proposed model, the experimental collected data of the solar radiation obtained from the existing radiometric stations installed at the two locations under investigation, are compared with the estimated or predicted solar radiations obtained from the Capderou and R.Sun models, where four days under clear skies are selected from different seasons to achieve this comparison. Second, the daily averages of the experimental global solar irradiation are compared to those predicted by Mefti model for both the sites. Finally, a validation is carried out based on the obtained experimental monthly global irradiations and with those estimated by Coppolino and Sivkov models. A relative difference is used in this case to judge the reliability and the accuracy of each model for both sites.

scholarly journals Comparative Study of Ground Measured, Satellite-Derived, and Estimated Global Solar Radiation Data in Nigeria

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Boluwaji M. Olomiyesan ◽  
Onyedi D. Oyedum
Keyword(s):  
Solar Radiation ◽  
Comparative Study ◽  
Global Radiation ◽  
Statistical Error ◽  
Global Solar Radiation ◽  
Coefficient Of Determination ◽  
Mean Bias Error ◽  
Percentage Error ◽  
Radiation Data ◽  
Proposed Model

In this study, the performance of three global solar radiation models and the accuracy of global solar radiation data derived from three sources were compared. Twenty-two years (1984–2005) of surface meteorological data consisting of monthly mean daily sunshine duration, minimum and maximum temperatures, and global solar radiation collected from the Nigerian Meteorological (NIMET) Agency, Oshodi, Lagos, and the National Aeronautics Space Agency (NASA) for three locations in North-Western region of Nigeria were used. A new model incorporating Garcia model into Angstrom-Prescott model was proposed for estimating global radiation in Nigeria. The performances of the models used were determined by using mean bias error (MBE), mean percentage error (MPE), root mean square error (RMSE), and coefficient of determination (R2). Based on the statistical error indices, the proposed model was found to have the best accuracy with the least RMSE values (0.376 for Sokoto, 0.463 for Kaduna, and 0.449 for Kano) and highest coefficient of determination, R2 values of 0.922, 0.938, and 0.961 for Sokoto, Kano, and Kaduna, respectively. Also, the comparative study result indicates that the estimated global radiation from the proposed model has a better error range and fits the ground measured data better than the satellite-derived data.

scholarly journals IRRADIAÇÃO SOLAR GLOBAL PARA CIDADE DE MAPUTO - MOÇABIQUE: EVOLUÇÃO TEMPORAL DAS MEDIDAS E MODELAGEM ESTATÍSTICA

2019 ◽  
Vol 34 (01) ◽  
pp. 82-93
Author(s):  
Domingos Mário Zeca Fernando ◽  
Marcus Vinicius Contes Calca ◽  
Matheus Rodrigues Raniero ◽  
Alexandre Dal Pai
Keyword(s):  
Solar Radiation ◽  
Statistical Modeling ◽  
Solar Irradiance ◽  
Temporal Evolution ◽  
Solar Irradiation ◽  
Global Media ◽  
Global Solar Irradiation ◽  
Maputo City ◽  
The City ◽  
E Mail

IRRADIAÇÃO SOLAR GLOBAL PARA CIDADE DE MAPUTO - MOÇABIQUE: EVOLUÇÃO TEMPORAL DAS MEDIDAS E MODELAGEM ESTATÍSTICA   DOMINGOS MÁRIO ZECA FERNANDO¹; MARCUS VINÍCIUS CONTES CALÇA²; MATHEUS RODRIGUES RANIERO³ E ALEXANDRE DAL PAI4   ¹Departamento de Ciências Naturais e Matemática, Universidade Púnguè,  Bairro Heróis Moçambicanos, C. Postal: 323, Cidade de Chimoio, Moçambique, e-mail: [email protected]. 2Departamento de bioprocessos e biotecnologia, Universidade Estadual Paulista, Av. Universitária, nº 3780 - Altos do Paraíso, Botucatu - SP, 18610-034, Brasil, e-mail: [email protected]. 3Departamento de bioprocessos e biotecnologia, Universidade Estadual Paulista, Av. Universitária, nº 3780 - Altos do Paraíso, Botucatu - SP, 18610-034, Brasil, e-mail: [email protected]. 4Departamento de bioprocessos e biotecnologia, Universidade Estadual Paulista, Av. Universitária, nº 3780 - Altos do Paraíso, Botucatu - SP, 18610-034, Brasil, e-mail: [email protected].   RESUMO: A equação de Angstrom continua sendo a relação mais usada para se estimar a irradiação solar global média diária a partir das horas de brilho solar, em localidades onde a medição não seja contínua ou os equipamentos não estejam disponíveis. O objetivo deste trabalho foi de apresentar a evolução das medidas de irradiação solar e das horas de brilho solar e determinar os coeficientes de Angstrom para estimativa da irradiação solar global na cidade de Maputo. A média da irradiação solar global na cidade de Maputo foi de 17,96 MJ/m² e as horas de brilho solar foram de 7,8 horas. Os coeficientes “a” e “b” do modelo anual para estimativa da irradiação solar global na cidade de Maputo são 0,23 e 0,49 respetivamente.   Palavras-chaves: brilho solar, estimativa irradiação solar global, modelo de angstrom.   GLOBAL SOLAR IRRADIATION FOR MAPUTO CITY - MOZAMBIQUE: TEMPORAL EVOLUTION OF MEASUREMENTS AND STATISTICAL MODELING   ABSTRACT: The Angstrom equation continues to be the most used relation to estimate the daily average global solar irradiation from sunshine, in places where measurement is not continuous or equipment is not available. The aim of this work was to present the evolution of solar radiation and sunshine measurements and to determine the Angstrom coefficients to estimate global solar irradiation in the city of Maputo. The average of the global solar irradiance in the city of Maputo was 17.96 MJ/m² and sunshine average was 7.8 hours. The coefficients "a" and "b" of the annual model for estimation of global solar irradiation in the city of Maputo were 0.23 and 0.49, respectively.   Keywords: sunshine, estimation of global solar irradiation, Angstrom model.

scholarly journals Estimation of the Hourly Global Solar Irradiation on the Tilted and Oriented Plane of Photovoltaic Solar Panels Applied to Greenhouse Production

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 495
Author(s):  
Francisco J. Diez ◽  
Andrés Martínez-Rodríguez ◽  
Luis M. Navas-Gracia ◽  
Leticia Chico-Santamarta ◽  
Adriana Correa-Guimaraes ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Time Of Day ◽  
Solar Panel ◽  
Solar Irradiation ◽  
Angle Of Incidence ◽  
Solar Panels ◽  
Greenhouse Production ◽  
Anisotropic Models ◽  
Diffuse Solar Radiation ◽  
Global Solar Irradiation

Agrometeorological stations have horizontal solar irradiation data available, but the design and simulation of photovoltaic (PV) systems require data about the solar panel (inclined and/or oriented). Greenhouses for agricultural production, outside the large protected production areas, are usually off-grid; thus, the solar irradiation variable on the panel plane is critical for an optimal PV design. Modeling of solar radiation components (beam, diffuse, and ground-reflected) is carried out by calculating the extraterrestrial solar radiation, solar height, angle of incidence, and diffuse solar radiation. In this study, the modeling was done using Simulink-MATLAB blocks to facilitate its application, using the day of the year, the time of day, and the hourly horizontal global solar irradiation as input variables. The rest of the parameters (i.e., inclination, orientation, solar constant, albedo, latitude, and longitude) were fixed in each block. The results obtained using anisotropic models of diffuse solar irradiation of the sky in the region of Castile and León (Spain) showed improvements over the results obtained with isotropic models. This work enables the precise estimation of solar irradiation on a solar panel flexibly, for particular places, and with the best models for each of the components of solar radiation.

scholarly journals Biaxial Equatorial Solar Tracker with High Precision and Low Consumption: Modelling and Realization

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Hicham Bouzakri ◽  
Ahmed Abbou ◽  
Khalil Tijani ◽  
Zakaria Abousserhane
Keyword(s):  
Solar Radiation ◽  
Minimum Energy ◽  
Solar Irradiation ◽  
Normal Surface ◽  
Photovoltaic Panel ◽  
Concept Model ◽  
Minimum Energy Consumption ◽  
Proposed Model ◽  
Detailed Simulation ◽  
Solar Tracker

The solar tracker is a mechanism that helps the photovoltaic panel to maximize its performance, while keeping it oriented towards direct solar radiation. In order to specify tracking, most solar trackers use two axes, one horizontal and the other vertical, which implies an increase of the consumed energy and a decrease in precision, since we have to make both motors operate simultaneously. This paper is a modelling of a biaxial solar tracker, with the principle of an equatorial mount, allowing it to precisely follow the sun via a single axis (equatorial axis), while the second axis (tilt axis) makes a small daily correction of few seconds at sunrise. In this way, our model keeps precision to the maximum, with minimum energy consumption. A detailed simulation clearly shows that the proposed model receives the maximum solar irradiation that a normal surface to solar radiation can receive and may in a certain period of the year receive a gain in the amount of solar irradiation; we have up to 63.47% compared to a fixed installation. The study details the different tracking methods, in order to adapt the concept model to the type of solar panel used. We closed finish the study with the realization of the prototype with a detailed explanation of the concept movement. To validate the simulation, we have made an experience that gives us the same results as given by simulation.

scholarly journals Estimation of Global Solar Radiation on Horizontal Surfaces using Temperature-Based Model in Ilorin, Nigeria

2021 ◽  
Author(s):  
YAQUB BABATUNDE ADEDIJI ◽  
Ayobami Bamigboye ◽  
Joel Oluwaremilekun Aboderin ◽  
Onyeije Allison Lekwa ◽  
Emmanuel Onyedikachi Uzim
Keyword(s):  
Solar Radiation ◽  
Global Solar Radiation ◽  
Measuring System ◽  
Solar Irradiation ◽  
Clearness Index ◽  
Power Parameter ◽  
Diffuse Solar Radiation ◽  
Global Solar Irradiation ◽  
The Mean ◽  
Parameter Measuring

In this study, the Solar Irradiation received was estimated in Illorin, Kwara, Nigeria, using the maximum and minimum temperature measured by an Arduino-based solar power parameter measuring system. The Extraterrestrial, Global and Diffuse Solar Radiation were estimated monthly using the Hargreaves and Samani model. This model also required the daily temperature, clearness index, and extraterrestrial solar irradiation in its use alongside the maximum and minimum temperatures. In using this model, we resolved the graphs of the three types of Solar Irradiation over ten days. For the selected days, the estimated extraterrestrial solar irradiation varies from 10.41kWh/m2 to 10.47 kWh/m2, while the mean extraterrestrial solar irradiation is 10.44 kWh/m2. The estimated global solar irradiation varies from 4.42 kWh/m2 to 5.677kWh/m2, while the estimated mean global solar irradiation is 5.19kWh/m2 per day. The estimated diffuse solar irradiation varies from 3.46kWh/m2 to 5.48kWh/m2, while the mean diffuse solar irradiation is per day is 4.61kWh/m2.

scholarly journals Modeling the Incident Solar Radiation of the City of N’Djamena (Chad) by the Capderou Method

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Mahamat Hassane Babikir ◽  
Donatien Njomo ◽  
Mahamat Barka ◽  
Mahamoud Youssouf Khayal ◽  
Deli Goron ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Diffuse Radiation ◽  
Theoretical Models ◽  
African Countries ◽  
Incident Solar Radiation ◽  
Diffuse Solar Radiation ◽  
Different Seasons ◽  
The Moment ◽  
Desert Climate

Chad is like many African countries with no meteorological station at the moment to measure solar radiation throughout the country. Thus, theoretical models are used to estimate incident solar radiation. These models are established in correlation form. Our objective was to present a model, which allows the determination of the solar component on two surfaces (horizontal and inclined). This model allowed us to determine, over time, the component of global, direct, and diffuse solar radiation over a period that will cover the different seasons of the year. The calculation is done according to Klein’s days over all the months of the year. The hourly results of the global, direct, and diffuse radiation obtained for all the planes going from January to December are satisfactory compared to the results of the other authors quoted in the literature, which give the maximum and minimum values very close to theirs. These results allowed us to validate the applicability of this model in a climate other than the desert climate.

scholarly journals Predicting Global Solar Radiation Using an Artificial Neural Network Single-Parameter Model

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Karoro Angela ◽  
Ssenyonga Taddeo ◽  
Mubiru James
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Solar Radiation ◽  
Global Solar Radiation ◽  
Single Parameter ◽  
Solar Irradiation ◽  
Global Solar Irradiation ◽  
Sunshine Hours ◽  
Artificial Neural ◽  
Propagation Network

We used five years of global solar radiation data to estimate the monthly average of daily global solar irradiation on a horizontal surface based on a single parameter, sunshine hours, using the artificial neural network method. The station under the study is located in Kampala, Uganda at a latitude of 0.19°N, a longitude of 32.34°E, and an altitude of 1200 m above sea level. The five-year data was split into two parts in 2003–2006 and 2007-2008; the first part was used for training, and the latter was used for testing the neural network. Amongst the models tested, the feed-forward back-propagation network with one hidden layer (65 neurons) and with the tangent sigmoid as the transfer function emerged as the more appropriate model. Results obtained using the proposed model showed good agreement between the estimated and actual values of global solar irradiation. A correlation coefficient of 0.963 was obtained with a mean bias error of 0.055 MJ/m2 and a root mean square error of 0.521 MJ/m2. The single-parameter ANN model shows promise for estimating global solar irradiation at places where monitoring stations are not established and stations where we have one common parameter (sunshine hours).

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