Open Access Original Research Article

Validation of Global Solar Radiation Models on a Horizontal Surface in the Climatic Zones of Burkina

Nana Goumwêndkouni Gilbert, Konfé Amadou, Ouédraogo Souleymane, Ky Thierry Sikoudouin Maurice, Kam Sié, Bathiébo M. J. Dieudonné

Physical Science International Journal, Page 1-16
DOI: 10.9734/psij/2022/v26i5742

The evaluation of the solar deposit is essential for the sizing of photovoltaic systems. This requires the availability of radiation data. In Burkina Faso, weather data doesn’t cover all the country. That makes that solar radiation measured are not available for the all country. Theorical methods can help about it. This paper is written to fill the gap of adapted solar models for the country. In this work, an analysis of the results provided by four models for the estimation of hourly values ​​of global radiation on a horizontal plane was made. The radiation data for the year 2017 comes from the Burkina weather forecast. The validation of the models is carried out by a comparison between the radiation measured and that given by the various models provided by MATLAB code. The different models have been validated by several statistical indicators (RMSE and normalized MAE) and graphs for a clear sky. Scoring criteria have been established to assess the relative quality of each model. The models retained for the study are the Bird and Hulstrom model, the Davy and Hay model, the Capderou model and the Liu and Jordan model. Three sites were affected: Ouagadougou, Dori and Gaoua. We found that for some models, there is a good agreement between the measured values ​​and those estimated by some models for the Dori site, while they are not with the values ​​measured for the Ouagadougou and Gaoua sites. In the town of Dori, the most appropriate model for estimating solar radiation is that of Bird and Hulstrom. For the cities of Ouagadougou and Gaoua, the different models are not suitable.

Open Access Original Research Article

Angular Distribution of Atomic Photoelectrons as a Function of Photon Field Polarization: Case of Ns-type Light Atoms

Issoufou Arzika Alio, Almoustapha Aboubacar

Physical Science International Journal, Page 17-25
DOI: 10.9734/psij/2022/v26i5743

The angular distribution of the atomic photoelectrons gives us information on the evolution of the field of the photoelectrons in different directions concerning the incident direction of the electromagnetic radiation which is absorbed by the atom and its direction of polarization. Here, the angular distribution of atomic photoelectrons as a function of photon field polarization was studied theoretically using monocentric wave functions to investigate the influence of polarization on the theoretical results. A GEANT4 modeling calculation based on the Monte Carlo code was made on the helium atom. The calculations were performed at low energy above the atomic ionization threshold. The results obtained by analytical calculation for the total photoionization cross-section were compared with those obtained by a simulation calculation using GEANT4 modeling. A reasonable agreement was observed following this comparison for a range of energy considered in this study.