Abstract
The paper presents a solar radiation monitoring system, using two scientificpyranometers and an on-line computer home-made data acquisition system. The firstpyranometer measures the global solar radiation and the other one, which is shaded,measure the diffuse radiation. The values of total and diffuse solar radiation arecontinuously stored into a database on a server. Original software was created for dataacquisition and interrogation of the created system. The server application acquires the datafrom pyranometers and stores it into a database with a baud rate of one record at 50seconds. The client-server application queries the database and provides descriptivestatistics. A web interface allow to any user to define the including criteria and to obtainthe results. In terms of results, the system is able to provide direct, diffuse and totalradiation intensities as time series. Our client-server application computes also derivateheats. The ability of the system to evaluate the local solar energy potential is highlighted.
Highlights
In the context of our day’s relatively acute energy crisis, the scientific world is reconsidering the approach through all types of renewable energies
Following information results for a time step of one minute: - The average value of the total radiation intensity for sunshine duration is around 441 W/m2 comparing with the value of 163 W/m2 corresponding to the whole 24 hours considered period; - The average value of the diffuse radiation intensity for sunshine duration is around 37 W/m2 comparing with the value of 14 W/m2 corresponding to the whole 24 hours considered period; - The average value of the direct radiation intensity for sunshine duration is around 403 W/m2 comparing with the value of 148 W/m2 corresponding to the whole 24 hours considered period;
The preliminary results obtained with the presented solar radiation monitoring system, proves that important and relevant information can be obtained by its use
Summary
In the context of our day’s relatively acute energy crisis, the scientific world is reconsidering the approach through all types of renewable energies. The solar energy is representing one with the highest potential, all over the world. For a very long period of time, the Sun can be considered a huge source of free energy, being the unique energy source able to entertain the life on Earth. The life of the Sun is estimated at the following 4-5 billions of years, this being an enough reason to exploit the solar energy potential. The incoming solar radiant energy, per square meter, at the outside limit of the earth atmosphere, named solar constant, determined by satellite technologies measurements, is reported in range of 1350...1366. From the outside limit of the atmosphere, until the Earth surface, the intensity of the solar radiation is decreased by several known effects (reflection, dispersion, absorption, etc.) and at the ground, solar radiation presents very different values, depending on:
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