Researchers in Taiwan have developed a system with a 2 × 2 Fresnel lens array and a photo voltaic panel manufactured from III-V supplies and polycrystalline photo voltaic cells, with low mild leakage.
A Taiwanese analysis group claims to have found the reason for pure mild leakage in high-concentration photovoltaic (HCPV) methods that use a Fresnel lens as a focusing lens.
Scientists say that HCPV methods mixed with Fresnel lenses are capable of take in daylight even in cloudy climate situations and that, nevertheless, these units undergo from mild leakages. .
“Fresnel lenses are designed to cut back the burden of the lens so it may well meet the necessities of a sun-tracking system,” they stated. “Nonetheless, in contrast to standard lenses, non-smooth and discontinuous lens surfaces distributed over many areas can inevitably trigger vital mild leakage because of manufacturing errors such because the radii of curvature and draft angles of manufactured Fresnel lenses.”
The researchers consider that using a Fresnel lens with a width of 129 mm and a thickness of 1.81 mm. They thought-about a focusing space with a dimension of 1.1 mm × 1.1 mm, a spotlight energy ratio of 63%, and a lightweight leakage ratio outdoors the focusing space of 37%. In addition they measured the sunshine power within the mild leakage space of Fresnel lenses with completely different constructions underneath monochromatic mild irradiation and used diffuse plates with completely different penetration charges to simulate outside situations in different- one other thickness of the cloud layer.
Primarily based on the outcomes of this simulation, the group was capable of design a HCPV system that may reportedly present good efficiency even underneath cloudy skies. It features a 2 × 2 Fresnel lens array in a field with two rotation dimensions that may be manually adjusted to face the solar instantly at any time. The PV unit depends on a high-efficiency photo voltaic panel based mostly on III-V supplies on the focus level and polycrystalline photo voltaic cells positioned round it.
“The sunshine leakage from the Fresnel lens construction and the scattered mild from the daylight passing by means of the clouds could be directed to the polycrystalline silicon-based photo voltaic panel for energy technology,” the lecturers stated. “When the sky is evident, the sunshine is concentrated within the high-efficiency photo voltaic cell, so the facility technology effectivity is excessive. In a heavy cloud, the daylight can’t be concentrated within the high-efficiency photo voltaic cell, due to this fact a standard HCPV can not generate electrical energy effectively, however this design can nonetheless generate electrical energy by means of polycrystalline photo voltaic panels.
By the simulation, the Taiwanese group confirmed that the Fresnel lens can attain the sunshine of about 20,000 to 40,000 lx within the mild leakage area, whether or not it’s sunny or cloudy day with completely different cloud thickness.
The analysis group introduced the HCPV system within the research “Hybrid high-concentration photovoltaic system designed for various climate situations,” which was just lately printed in Scientific studies.
The group consists of scientists from the Nationwide Central College of Taiwan and the Nationwide Yang Ming Chiao Tung College.
“The proposed novel solar energy system is helpful for attaining optimum solar energy technology underneath completely different cloudy skies,” they concluded.
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