Solar radiation

Solar radiation

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Setting up a photovoltaic system requires a certain initial investment and, to ensure an economic return within a reasonable time, it is necessary to evaluate thesolar radiation of the area where you intend to proceed with the installation so as to estimate, with some precision, what will be the energy performance of the photovoltaic panels. The efficiency of a classic silicon photovoltaic cell is maximum in correspondence with the frequency range of visible light and its yield depends on the radiation incident on the cell surface.

There is another parameter that affects the yield of a photovoltaic panel: the temperature. As we wrote in our article about thermal radiation, the performance of solar panels can be easily influenced by temperature. In fact, like all other semiconductors, solar cells are also sensitive to temperature. An increase in temperature reduces the "band gap" of a semiconductor, thus affecting most of the semiconductor parameters. High values ​​of the temperature cause a reduction in the energy production of a photovoltaic system.

It is for this reason that in measuring thesolar radiation, to estimate the potential capacity of a photovoltaic system, the effect of the temperature on the photovoltaic cell is also measured. This measurement can be done with a thermocouple.

How is thesolar radiation
Before proceeding with the installation of a solar system, an evaluation of theirradiation. The user can get a first idea by consulting the map of solar radiation, an altant that shows solar radiation on the Italian territory. The Italian atlas of solar radiation shows maps of the territory and measurements for individual locations, provides calculation programs, solar diagrams, radiation estimation and documentation collected by the National Agency for New Technologies, Energy and Sustainable Economic Development (Agency for New Technologies, Energy and the Environment: ENEA).

L'solar radiation it is measured with sensors able to detect how much solar radiation reaches the site where you intend to install a system. There are essentially two types of deliveries, the solarimeter and the pyranometer, both sensors are used in combination with a thermocouple in order to take into account the effect of the temperature on the cell.

Video: Reflection of Incoming Solar Radiation (May 2022).