Valutazione mediante tecnica fotografica dell'oscuramento della radiazione solare dovuto alle ostruzioni

Research output: Contribution to conferenceOther

Abstract

[automatically translated] It proposes a new method which allows to use the photographic image of shading obstacles to assess the darkening effect against direct solar radiation incident on a surface. The proposed method is similar to that which involves the use of the cylindrical diagram of the solar paths, calculated as a function of azimuth and solar height, and the superimposition of the polygon on it depicting the obstructing object constructed by using the cylindrical coordinates of its most significant points. The new procedure instead provides the overlap on the photograph of the solar path appropriately transformed according to the rules of perspective. And 'so possible to draw directly on the images the position of the sun at the times required for any day of the year and location, using for this purpose the knowledge of an extremely limited number of data, however, easily available. The portions of the path intercepted by the outline of the obstacles represented in the photographic image indicate the time periods during which the point of the receiving surface is shaded. Conversely the remaining stretches of the solar path show the presence of the direct radiation component. They are presented also the results of the comparison between the calculated data and experimental ones conducted at the Department of Energy and Environmental Research (DREAM) of Palermo. The portions of the path intercepted by the outline of the obstacles represented in the photographic image indicate the time periods during which the point of the receiving surface is shaded. Conversely the remaining stretches of the solar path show the presence of the direct radiation component. They are presented also the results of the comparison between the calculated data and experimental ones conducted at the Department of Energy and Environmental Research (DREAM) of Palermo. The portions of the path intercepted by the outline of the obstacles represented in the photographic image indicate the time periods during which the point of the receiving surface is shaded. Conversely the remaining stretches of the solar path show the presence of the direct radiation component. They are presented also the results of the comparison between the calculated data and experimental ones conducted at the Department of Energy and Environmental Research (DREAM) of Palermo.
Original languageItalian
Number of pages10
Publication statusPublished - 2010

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