An approach is presented to the solar radiation possible to obtain in the provinces El Oro, Loja and Zamora Chinchipe, South Region of Ecuador (RSE) using images of the Geostationary Satellite GOES-East, and the data of global radiation obtained in a net of five automatic stations located in the RSE from which a theoretical model was obtained, by means of multiple regression analysis among the bands RGB (Red, Green, Blue) of the Visible and Infrared images of the GOES and the instantaneous data of global radiation in the stations. The data of global radiation are presented for an independent data set of selected days, as well as maps of global radiation in the RSE for the selected days. They are compared with results obtained by means of theoretical models. Conclusions are given and recommendations are formulated.
One of the objectives of the present work is the determination of areas in which it is possible the use of the Eolic energy. In the study area information is not enough, reason why it is necessary to use other sources of data. Digital Elevation Models (DEM) allow us to know areas where the winds can flow due to orographic factors. A DEM for the area of the project was processed and obtained, with nodes every 0,001◦ . Data of reanalysis of different elements performed by NASA were used. The equations corresponding to the variation of wind speed with altitude were calculated for every node, obtaining in each case a lineal model as a function of the natural logarithm of height. Maps of wind speed and direction were obtained for the wind at 50 meters from the reanalysis, which show a pattern that do not correspond with the presence of the Andean mountain range. Then the linear models with the DEM natural logarithm were used to elaborate more consistend wind speed maps at heights of 10, 50 and 80 m.
Different theoretical models exist for obtaining an initial knowledge about the solar radiation values on a horizontal surface in a certain place. The present work is focused in obtaining the solar radiation values on a horizontal surface using Hottel model. For the realization of the present work it was made an Microsoft Excel© book and using for it the methodology proposed by Passamai, adding a group of additional worksheets to obtain in an automatic way the monthly and annual summary of the daily values in order to use geographical points to interpolate these summaries later on in a Computer Aid Designs Software (CAD) to made the different maps for the work area. A total of 370 points was processed according to height, latitude and longitude corresponding to the Digital Elevation Model (DEM), spaced 0.1◦ (approximately each 10 km) to obtained monthly and annual values of direct, diffuse and global radiation, on a horizontal surface. The values of Monthly global radiation are shown for clear sky.
In this work is presented an approach to the theoretical solar radiation in El Oro, Loja and Zamora Chinchipe provinces (Ecuador), from the Hottel’s Model, considering the daylight cloud amount and using atmospheric transmittance, solar zenith angle, altitude, and climate type. Resulting Global Solar Radiation amounts using altitudes of the Digital Terrain Model of the study area are shown for annual totals and for the months of January and August. Conclusions and recommendations are given.
This work aims at obtaining a method to homogenize series of wind speed, in the meteorological stations of the National Meteorological and Hidrological Institute (INAMHI) in the Loja Province, Ecuador Republic. Homogenization tests applied include non-parametric and the Alexandersson test (SNHT). Multiple Regression Analysis is used to determine the problematic values from the absolute values of the Student residuals bigger than 3 and to calculate the their replacements. Results are shown for the January series. We conclude that this methodology has yielded good results, and give recommendations for their utilization.