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Title: Optical Durability of Candidate Solar Reflectors for Concentrating Solar Power

Abstract

Concentrating solar power (CSP) technologies use large mirrors to collect sunlight to convert thermal energy to electricity. The viability of CSP systems requires the development of advanced reflector materials that are low in cost and maintain high specular reflectance for extended lifetimes under severe outdoor environments. The long-standing goals for a solar reflector are specular reflectance above 90% into a 4 mrad half-cone angle for at least 10 years outdoors with a cost of less than $$13.8/m{sup 2} (the 1992 $$10.8/m{sup 2} goal corrected for inflation to 2002 dollars) when manufactured in large volumes. Durability testing of a variety of candidate solar reflector materials at outdoor test sites and in laboratory accelerated weathering chambers is the main activity within the Advanced Materials task of the CSP Program at the National Renewable Energy Laboratory (NREL) in Golden, Colorado. Test results to date for several candidate solar reflector materials will be presented. These include the optical durability of thin glass, thick glass, aluminized reflectors, front-surface mirrors, and silvered polymer mirrors. The development, performance, and durability of these materials will be discussed. Based on accelerated exposure testing the glass, silvered polymer, and front-surface mirrors may meet the 10 year lifetime goals, but at this time because of significant process changes none of the commercially available solar reflectors and advanced solar reflectors have demonstrated the 10 year or more aggressive 20 year lifetime goal.

Authors:
;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
978483
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the Solar 2007 Conference, 8-12 July 2007, Cleveland, Ohio (CD-ROM); Including Proceedings of 36th ASES Annual Conference, Proceedings of 32nd National Passive Solar Conference, and Proceedings of the 2nd Renewable Energy Policy and Marketing Conference
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; ELECTRICITY; GLASS; LIFETIME; MIRRORS; NATIONAL RENEWABLE ENERGY LABORATORY; OUTDOORS; PERFORMANCE; POLYMERS; SOLAR REFLECTORS; TESTING; VIABILITY; WEATHERING; Solar Energy - Thermal

Citation Formats

Kennedy, C. E., and Terwilliger, K.. Optical Durability of Candidate Solar Reflectors for Concentrating Solar Power. United States: N. p., 2007. Web.
Kennedy, C. E., & Terwilliger, K.. Optical Durability of Candidate Solar Reflectors for Concentrating Solar Power. United States.
Kennedy, C. E., and Terwilliger, K.. Mon . "Optical Durability of Candidate Solar Reflectors for Concentrating Solar Power". United States. doi:.
@article{osti_978483,
title = {Optical Durability of Candidate Solar Reflectors for Concentrating Solar Power},
author = {Kennedy, C. E. and Terwilliger, K.},
abstractNote = {Concentrating solar power (CSP) technologies use large mirrors to collect sunlight to convert thermal energy to electricity. The viability of CSP systems requires the development of advanced reflector materials that are low in cost and maintain high specular reflectance for extended lifetimes under severe outdoor environments. The long-standing goals for a solar reflector are specular reflectance above 90% into a 4 mrad half-cone angle for at least 10 years outdoors with a cost of less than $13.8/m{sup 2} (the 1992 $10.8/m{sup 2} goal corrected for inflation to 2002 dollars) when manufactured in large volumes. Durability testing of a variety of candidate solar reflector materials at outdoor test sites and in laboratory accelerated weathering chambers is the main activity within the Advanced Materials task of the CSP Program at the National Renewable Energy Laboratory (NREL) in Golden, Colorado. Test results to date for several candidate solar reflector materials will be presented. These include the optical durability of thin glass, thick glass, aluminized reflectors, front-surface mirrors, and silvered polymer mirrors. The development, performance, and durability of these materials will be discussed. Based on accelerated exposure testing the glass, silvered polymer, and front-surface mirrors may meet the 10 year lifetime goals, but at this time because of significant process changes none of the commercially available solar reflectors and advanced solar reflectors have demonstrated the 10 year or more aggressive 20 year lifetime goal.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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