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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/23432
Title: Enhancing the efficiency of solar concentrators by controlled optical aberrations: Method and photovoltaic application
Authors: GIANNUZZI, ALESSANDRA
DIOLAITI, EMILIANO 
LOMBINI, MATTEO 
DE ROSA, ADRIANO GIUSEPPE 
MARANO, BRUNO
BREGOLI, Giovanni 
Cosentino, Giuseppe
FOPPIANI, ITALO 
SCHREIBER, LAURA 
Issue Date: 2015
Journal: APPLIED ENERGY 
Number: 145
First Page: 211
Abstract: We present a general method, based on controlled static aberrations induced in the reflectors, to boost receiver performances in solar concentrators. Imaging mirrors coupled with dense arrays suffer from severe performance degradation since the solar irradiance distribution is bell-shaped: mismatch losses occur in particular when the cells are series connected. The method consists in computing static deformations of the reflecting surfaces that can produce, for an adopted concentration ratio, a light spot matching the receiver features better than conventional reflectors. The surfaces and the deformations have been analytically described employing the Zernike polynomials formalism. The concept here described can be applied to a variety of optical configurations and collecting areas. As an example, we extensively investigated a dense array photovoltaic concentrator, dimensioned for a nominal power of about 10 kWe. The "flat" distribution of light we obtain can exploit the PV device cells close to their efficiency limit. A significant gain is thus obtained, with no need of secondary optics or complex dish segmentation and of special features in the receiver electrical scheme. In the design, based on seven 2.6 m mirrors, we addressed also non-optical aspects as the receiver and the supporting mechanics. Optical and mechanical tolerances are demonstrated not to exceed accurate, but conventional, industrial standards.
URI: http://hdl.handle.net/20.500.12386/23432
URL: https://www.sciencedirect.com/science/article/abs/pii/S030626191500121X
ISSN: 0306-2619
DOI: 10.1016/j.apenergy.2015.01.085
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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