Optical design of wavelength-selective CPVT system with 3D/2D hybrid concentration

N. Ahmad; T. Ijiro; N. Yamada; T. Kawaguchi; T. Maemura; H. Ohashi

doi:10.1117/12.929395

11 October 2012 Optical design of wavelength selective CPVT system with 3D/2D hybrid concentration

N. Ahmad, T. Ijiro, N. Yamada, T. Kawaguchi, T. Maemura, H. Ohashi

Proceedings Volume 8485, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX; 84850T (2012) https://doi.org/10.1117/12.929395
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

Citation Download Citation

N. Ahmad, T. Ijiro, N. Yamada, T. Kawaguchi, T. Maemura, and H. Ohashi "Optical design of wavelength selective CPVT system with 3D/2D hybrid concentration", Proc. SPIE 8485, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX, 84850T (11 October 2012); https://doi.org/10.1117/12.929395

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