DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Method of manufacturing large dish reflectors for a solar concentrator apparatus

Abstract

A method of manufacturing monolithic glass reflectors for concentrating sunlight in a solar energy system is disclosed. The method of manufacturing allows large monolithic glass reflectors to be made from float glass in order to realize significant cost savings on the total system cost for a solar energy system. The method of manufacture includes steps of heating a sheet of float glass positioned over a concave mold until the sheet of glass sags and stretches to conform to the shape of the mold. The edges of the dish-shaped glass are rolled for structural stiffening around the periphery. The dish-shaped glass is then silvered to create a dish-shaped mirror that reflects solar radiation to a focus. The surface of the mold that contacts the float glass preferably has a grooved surface profile comprising a plurality of cusps and concave valleys. This grooved profile minimizes the contact area and marring of the specular glass surface, reduces parasitic heat transfer into the mold and increases mold lifetime. The disclosed method of manufacture is capable of high production rates sufficiently fast to accommodate the output of a conventional float glass production line so that monolithic glass reflectors can be produced as quickly as amore » float glass production can make sheets of float glass to be used in the process.

Inventors:
 [1];  [1]
  1. Tucson, AZ
Issue Date:
Research Org.:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1034156
Patent Number(s):
8082755
Application Number:
12/463,026
Assignee:
Arizona Board of Regents (Tucson, AZ)
Patent Classifications (CPCs):
C - CHEMISTRY C03 - GLASS C03B - MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
DOE Contract Number:  
FG36-08GO88002
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Angel, Roger P, and Olbert, Blain H. Method of manufacturing large dish reflectors for a solar concentrator apparatus. United States: N. p., 2011. Web.
Angel, Roger P, & Olbert, Blain H. Method of manufacturing large dish reflectors for a solar concentrator apparatus. United States.
Angel, Roger P, and Olbert, Blain H. Tue . "Method of manufacturing large dish reflectors for a solar concentrator apparatus". United States. https://www.osti.gov/servlets/purl/1034156.
@article{osti_1034156,
title = {Method of manufacturing large dish reflectors for a solar concentrator apparatus},
author = {Angel, Roger P and Olbert, Blain H},
abstractNote = {A method of manufacturing monolithic glass reflectors for concentrating sunlight in a solar energy system is disclosed. The method of manufacturing allows large monolithic glass reflectors to be made from float glass in order to realize significant cost savings on the total system cost for a solar energy system. The method of manufacture includes steps of heating a sheet of float glass positioned over a concave mold until the sheet of glass sags and stretches to conform to the shape of the mold. The edges of the dish-shaped glass are rolled for structural stiffening around the periphery. The dish-shaped glass is then silvered to create a dish-shaped mirror that reflects solar radiation to a focus. The surface of the mold that contacts the float glass preferably has a grooved surface profile comprising a plurality of cusps and concave valleys. This grooved profile minimizes the contact area and marring of the specular glass surface, reduces parasitic heat transfer into the mold and increases mold lifetime. The disclosed method of manufacture is capable of high production rates sufficiently fast to accommodate the output of a conventional float glass production line so that monolithic glass reflectors can be produced as quickly as a float glass production can make sheets of float glass to be used in the process.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {12}
}

Works referenced in this record:

Cooling of photovoltaic cells under concentrated illumination: a critical review
journal, April 2005


Dish/photovoltaic cavity converter (PVCC) system for ultimate solar-to-electricty conversion efficiency-general concept and first performance predictions
conference, January 2002

  • Ortabasi, U.; Lewandowski, A.; McConnell, R.
  • Conference Record of the Twenty-Ninth IEEE Photovoltaic Specialists Conference 2002, Conference Record of the Twenty-Ninth IEEE Photovoltaic Specialists Conference, 2002.
  • https://doi.org/10.1109/PVSC.2002.1190925

Concentrator multijunction solar cell characteristics under variable intensity and temperature
journal, September 2008

  • Kinsey, Geoffrey S.; Hebert, Peter; Barbour, Kent E.
  • Progress in Photovoltaics: Research and Applications, Vol. 16, Issue 6
  • https://doi.org/10.1002/pip.834