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48 results on '"Russo, Juan M."'

13. Reflection hologram solar spectrum-splitting filters

Author

VanSant, Kaitlyn, Plesniak, Adam P., Zhang, Deming, Gordon, Michael, Russo, Juan M., Vorndran, Shelby, Escarra, Matthew, Atwater, Harry, Kostuk, Raymond K., VanSant, Kaitlyn, Plesniak, Adam P., Zhang, Deming, Gordon, Michael, Russo, Juan M., Vorndran, Shelby, Escarra, Matthew, Atwater, Harry, and Kostuk, Raymond K.

Abstract

In this paper we investigate the use of holographic filters in solar spectrum splitting applications. Photovoltaic (PV) systems utilizing spectrum splitting have higher theoretical conversion efficiency than single bandgap cell modules. Dichroic band-rejection filters have been used for spectrum splitting applications with some success however these filters are limited to spectral control at fixed reflection angles. Reflection holographic filters are fabricated by recording interference pattern of two coherent beams at arbitrary construction angles. This feature can be used to control the angles over which spectral selectivity is obtained. In addition focusing wavefronts can also be used to increase functionality in the filter. Holograms fabricated in dichromated gelatin (DCG) have the benefit of light weight, low scattering and absorption losses. In addition, reflection holograms recorded in the Lippmann configuration have been shown to produce strong chirping as a result of wet processing. Chirping broadens the filter rejection bandwidth both spectrally and angularly. It can be tuned to achieve spectral bandwidth suitable for spectrum splitting applications. We explore different DCG film fabrication and processing parameters to improve the optical performance of the filter. The diffraction efficiency bandwidth and scattering losses are optimized by changing the exposure energy, isopropanol dehydration bath temperature and hardening bath duration. A holographic spectrum-splitting PV module is proposed with Gallium Arsenide (GaAs) and silicon (Si) PV cells with efficiency of 25.1% and 19.7% respectively. The calculated conversion efficiency with a prototype hologram is 27.94% which is 93.94% compared to the ideal spectrum-splitting efficiency of 29.74%.

Published
2012

28. Holographic CPV field tests at the Tucson Electric Power solar test yard

Author

Cronin, Alexander D., primary, Castillo, Jose E., additional, Hauser, Paul, additional, Rosenberg, Glenn A., additional, Kumar, Rakesh, additional, Kostuk, Raymond K., additional, Zhang, Deming, additional, Russo, Juan M., additional, Vorndran, Shelby, additional, Lonij, Vincent P. A., additional, Greenberg, James, additional, and Brooks, Adria, additional

Published
2011
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38. Holographic diffraction-through-aperture spectrum splitting for increased hybrid solar energy conversion efficiency.

Author

Vorndran, Shelby, Russo, Juan M., Wu, Yuechen, Gordon, Michael, and Kostuk, Raymond

Subjects
*HYBRID solar energy systems, *HOLOGRAPHY, *ENERGY conversion, *PHOTOVOLTAIC cells, *BIOMASS energy
Abstract

A holographic module is designed to split light into two spectral bands for hybrid solar energy conversion. Incoming light is either transmitted to a large subsystem receiver or diffracted through an aperture in this receiver toward a second subsystem receiver. The holographic element is simulated using rigorous diffraction and ray-tracing methods. Two applications of the design are described and simulated. A photovoltaic/thermal system with 93% optical efficiency and adjustable subsystem power output ratio is designed to address solar intermittency and provide energy storage. A photovoltaic system added to an alga biofuel operation significantly increases energy output while maintaining 92% of the original algae yield. The energy return on investment of this photovoltaic/biofuel system is 2.4× greater than that of the biofuel system alone, leading to economically viable operation. Modifications to the standard holographic lens provide additional increases in spectrum-splitting capability, optical efficiency, and energy conversion efficiency. The diffraction-through-aperture concept is demonstrated as a successful approach to spectrum splitting for hybrid solar applications. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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45. Comparison of tracking and non-tracking holographic planar concentrator systems

Author

Kostuk, Raymond K., Zhang, Deming, Russo, Juan M., and Castro, Jose

Abstract

A comparison of static and single-axis tracking holographic planar concentrator systems is made. Tracking is used as a design parameter that can provide additional degrees of freedom in the spectrum and uniformity of the beam illuminating the photovoltaic cell surface. These parameters impact the energy yield of the system. An overview of these factors and an estimate of the cost differences for the two systems will be presented.

Published
2011
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