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Proceedings Paper

Optical design of wavelength-selective CPVT system with 3D/2D hybrid concentration
Author(s): N. Ahmad; T. Ijiro; N. Yamada; T. Kawaguchi; T. Maemura; H. Ohashi
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Paper Abstract

Optical design of a concentrating photovoltaic/thermal (CPVT) system is carried out. Using wavelength-selective optics, the system demonstrates 3-D concentration onto a solar cell and 2-D concentration onto a thermal receiver. Characteristics of the two types of concentrator systems are examined with ray-tracing analysis. The first system is a glazed mirror-based concentrator system mounted on a 2-axis pedestal tracker. The size of the secondary optical element is minimized to decrease the cost of the system, and it has a wavelength-selective function for performing 3-D concentration onto a solar cell and 2-D concentration onto a thermal receiver. The second system is a non-glazed beamdown concentrator system containing parabolic mirrors in the lower part. The beam-down selective mirror performs 3-D concentration onto a solar cell placed above the beam-down selective mirror, and 2-D concentration down to a thermal receiver placed at the bottom level. The system is mounted on a two-axis carousel tracker. A parametric study is performed for those systems with different geometrical 2-D/3-D concentration ratios. Wavelength-selective optics such as hot/cold mirrors and spectrum-splitting technologies are taken into account in the analysis. Results show reduced heat load on the solar cell and increased total system efficiency compared to a non-selective CPV system. Requirements for the wavelength-selective properties are elucidated. It is also shown that the hybrid concept with 2-D concentration onto a thermal receiver and 3-D concentration onto a solar cell has an advantageous geometry because of the high total system efficiency and compatibility with the piping arrangement of the thermal receiver.

Paper Details

Date Published: 11 October 2012
PDF: 9 pages
Proc. SPIE 8485, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX, 84850T (11 October 2012); doi: 10.1117/12.929395
Show Author Affiliations
N. Ahmad, Nagaoka Univ. of Technology (Japan)
T. Ijiro, Nagaoka Univ. of Technology (Japan)
N. Yamada, Nagaoka Univ. of Technology (Japan)
T. Kawaguchi, Mitsui Engineering & Shipbuilding Co., Ltd. (Japan)
T. Maemura, Mitsui Engineering & Shipbuilding Co., Ltd. (Japan)
H. Ohashi, Mitsui Engineering & Shipbuilding Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 8485:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Roland Winston; Jeffrey M. Gordon, Editor(s)

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