High solar energy concentration with a Fresnel lens

Applicability of silicon micro-finned heat sinks for 500× concentrating photovoltaics systems

“…The high concentrations are commonly achieved through reflection or refraction [24]: the most common geometries are shown in Fig. 2.…”

Dry sliding wear behaviour of nickel aluminides coatings produced by self-propagating high-temperature synthesis

“…Equipment technical characteristics are given in the literature [15]. When the Fresnel lens is positioned normal to the solar beams, they concentrate at the lens focus, a circular area with a diameter of 5 mm.…”

“…Simultaneously to this reaction a visible combustion wave is produced showing how the reactive conversion into the final product takes place [11][12][13][14]. High concentrated solar radiation achieved at the focus of the Fresnel lens installed at CENIM [15] is high enough for producing NiAl coatings on carbon steel pieces from a nickel and aluminium mixture by SHS [16][17][18]. The combination of SHS and concentrated solar radiation results in a simple, fast, low cost and environment friendly process for the production of NiAl and other intermetallic coatings.…”

A brief review of solar concentrators

“…A Fresnel lens consists of a flat optical component where the bulk substance is terminated because the surface comprises many small concentric grooves [1]. The grooves typify prisms because each groove is estimated by a flat surface that reflects according to the curvature at that position of the normal lens [13]. Normal lens and Fresnel lens [10] The concentration of flux is indicated in this manner [14]:…”