By Eduardo F. Camacho, Manuel Berenguel, Francisco R. Rubio, Diego Martínez
Control of solar power structures info the most solar power platforms, difficulties concerned with their regulate, and the way keep watch over structures may also help in expanding their potency. Thermal power platforms are explored extensive, as are photovoltaic iteration and different solar power functions comparable to sun furnaces and sunlight refrigeration platforms. This moment and up-to-date variation of complicated keep an eye on of sun crops comprises new fabric on: sun towers and sun monitoring; heliostat calibration, characterization and offset correction; sunlight radiation, estimation, prediction, and computation; and built-in keep an eye on of sunlight vegetation. This re-creation includes labored examples within the textual content in addition to proposed workouts and simulation types and so should be of significant use to the coed and educational, in addition to the economic practitioner.
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Additional info for Control of Solar Energy Systems
2 Sun Tracking 27 A characteristic fundamental to the capture of solar energy is that the amount of energy incident on a collector is reduced by a fraction equal to the cosine of the angle between the collector surface and the Sun’s rays. Knowing the position of the collector and the position of the Sun, equations may be used to predict the fraction of incoming solar energy that falls on the collector . Concentrating solar technologies can make use of only direct solar irradiance, that is, the beam that come directly from the solar disk and not those that could be reflected from the surroundings.
Sensible heat storage in solids. Latent heat storage. Thermochemical storage. Both liquids and solids are used for storage of sensible heat. In addition to the thermophysical properties of the material employed, the cost of this material also becomes relevant to selection . For temperatures up to 300°C, the most economical solution is mineral thermal oil at atmospheric pressure. For temperatures up to 410°C, synthetic or silicon oils are used, but they must work at low pressure and are more expensive.
The effective collecting area is reduced by the cosine of the angle formed by the normal to the collecting surface and the Sun position vector at any instant. The incident solar power must by reduced by applying the factor cos(θi ) in the calculations. This is clearly a reducing factor as −1 ≤ cos(θi ) ≤ 1. Most of the systems considered in this book are tracking the Sun, but most of them do not face it directly, so this imperfect tracking leads to the effect of the cosine factor. 1) where Eb is the direct normal irradiance [W/m2 ], G is the collector aperture area [m2 ] and cos(θi ) is the cosine of the incidence angle.
Control of Solar Energy Systems by Eduardo F. Camacho, Manuel Berenguel, Francisco R. Rubio, Diego Martínez