Category Archives: Solar Thermal and. Biomass Energy

Variation in the energy which can be intercepted by the position of the surfaces

Many factors affect the positioning of the solar system’s intercepting surfaces. Among them, the most important is the study of the place and users’ requirements; actually, it is important to examine carefully the consumptions trend during the year. Another factor that has a strong impact on the positioning of the intercepting surfaces is the shading phenomenon at the installation site. […]

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The solar radiation on the Earth’s soil during clear sky days

The solar energy which reaches Earth’s surface is much smaller than that which reaches a surface situated outside the atmosphere. This happens because of the phenomenon of diffusion and absorption of solar radiation by components of the atmosphere. The collision with molecules of air, steam and atmospheric dust results in scattered reflection because of which a part of the radiation […]

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Instantaneous direct radiation received on a surface

An inclined surface situated on the terrestrial plane is characterized by two geo­metrical quantities: inclination b, the inclination of the surface compared to the horizontal, and surface’s azimuth aw, the angle that the projection on the normal to the surface’s horizontal plane has to rotate to superimpose itself on the southern direction. If that rotation is counter clockwise, angle aw […]

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Medium-temperature solar thermal technology

Medium-temperature technology includes systems which are able to reach temper­atures between 100°C and 250°C. The most common application of the medium — temperature solar thermal system is represented by the solar oven (see Fig. 77): a parabolic reflector (composed of aluminium sheets mounted on a zinc-plated steel structure) concentrates the solar radiation towards a single point which works as a […]

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