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Keyword: mirrors
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Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. November 2011, 133(4): 044501.
Published Online: October 13, 2011
... Gaussian distribution yield the same results. In the given example, the Rayleigh method is found to be ∼40% faster than the Gaussian method. 11 10 2010 01 03 2011 13 10 2011 13 10 2011 Gaussian distribution light reflection mirrors Monte Carlo methods optical design...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2011, 133(3): 031022.
Published Online: August 16, 2011
.... Measuring slope deviations in the parabolic shape of the mirror panels in the accuracy and resolution required for these applications is a challenge as it is not required with the same characteristics in other industries. Photogrammetry and deflectometry are the two optical measurement methods that are...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2011, 133(3): 031017.
Published Online: July 28, 2011
... 28 07 2011 28 07 2011 mirrors power system simulation solar absorber-convertors solar energy concentrators solar power stations concentrated solar power tower heliostat field annual performance calculation software In contrast to fossil fired power plants, solar...
Journal Articles
Article Type: Design Innovations
J. Sol. Energy Eng. August 2011, 133(3): 035001.
Published Online: July 25, 2011
...Serhan M. Ardanuç; Amit Lal; Samuel C. Jones This paper presents a modular and scalable approach to concentrated solar power (CSP) harvesting by using low-profile, light-weight, sun-tracking, millimeter-to-centimeter-scale mirror arrays that can be wirelessly controlled to reflect the incident...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2011, 133(3): 031003.
Published Online: July 19, 2011
...Lifang Li; Andres Kecskemethy; A. F. M. Arif; Steven Dubowsky Parabolic concentrator mirrors are an important component of many solar energy systems, particularly solar mirror collectors. Precision parabolic mirrors are expensive to fabricate and to transport. Here, a new concept for designing and...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. February 2010, 132(1): 014501.
Published Online: January 11, 2010
... the analytical solution and investigate the effect of sun shape and mirror surface imperfections on the radiation uniformity and spillage. This design is pertinent to concentrating photovoltaics at moderate mean solar flux concentration ratios of up to 50 suns. 29 06 2009 22 10 2009 11...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2010, 132(1): 011003.
Published Online: November 9, 2009
... dominated by mirrors brought into position by steel structures and drives that guarantee high accuracies under wind loads and thermal stress situations. A large fraction of costs is caused by the stiffness requirements of the steel structure, typically resulting in ∼ 20 kg / m 2 steel per mirror area. The...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2009, 131(4): 041003.
Published Online: September 17, 2009
... solids are involved or heavy equipment has to be placed on top of a conventional tower. The theory of this optics has been thoroughly studied and reported elsewhere. This paper details the development and experience gained with the mirror facets of the tower reflector. Thermal and stress analyses are...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2009, 131(3): 031007.
Published Online: June 29, 2009
...R. Bader; P. Haueter; A. Pedretti; A. Steinfeld An innovative concept for fabricating solar trough concentrators based on pneumatic polymer mirrors supported on precast concrete frames is presented. Optical aberration is corrected by means of a secondary specular reflector in tandem with a primary...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2009, 131(1): 011001.
Published Online: January 6, 2009
...R. Buck; E. Teufel Heliostat canting (alignment of mirror facets) is known to have a major influence on the optical efficiency of heliostat fields and therefore on the power output of solar tower plants. In recent years several canting concepts were used, mainly on- and off-axis canting. Several...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2008, 130(1): 011010.
Published Online: December 28, 2007
...L. Amsbeck; R. Buck; A. Pfahl; R. Uhlig In standard heliostat design, the usual strategy of cost reduction is to increase the mirror area of the heliostats. This not only leads to a reduction of specific drive cost but also to an increase of the torques caused by the wind loads, resulting in higher...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. May 2007, 129(2): 141–146.
Published Online: July 8, 2006
... chemically compatible with liquid fluoride salts at high temperatures. About half the cost of a solar power tower is associated with the mirrors that focus light on the receiver, and less than one-third is associated with the power cycle and heat storage. Consequently, increasing the efficiency by 20–30% has...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. May 2007, 129(2): 153–159.
Published Online: June 5, 2006
...Richard B. Diver; Timothy A. Moss In this paper a new technique for parabolic trough mirror alignment based on the use of an innovative theoretical overlay photographic (TOP) approach is described. The technique is a variation on methods used to align mirrors on parabolic dish systems. It involves...
Journal Articles
Article Type: Article
J. Sol. Energy Eng. May 2005, 127(2): 262–269.
Published Online: April 25, 2005
...C. E. Kennedy; K. Terwilliger 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...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. August 2004, 126(3): 827–832.
Published Online: July 19, 2004
...S. Biryukov PETAL (Parabolic Energy Transformation and Astrophysics Laboratory) is a large multipurpose dish-shaped concentrator, located at Sede Boqer. Its 2-axis tracking paraboloidal surface, with aperture area in excess of 400 m 2 , is constructed from 216 adjustable mirror panels. The very...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. February 2004, 126(1): 676–679.
Published Online: February 12, 2004
... the work performed here is to match the two systems together for optimal performance. It is shown that a hollow, rectangular-shaped non-imaging (NI) device only 23 cm long can effectively distribute the IR flux incident on the TPV array mounted behind the secondary mirror. Results of the ray-tracing...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. February 2003, 125(1): 117–120.
Published Online: January 27, 2003
... ENGINEERING . Manuscript received by the ASME Solar Energy Division, August 2001; final revision, April 2002. Associate Editor: A. Kribus. 01 August 2001 01 April 2002 27 01 2003 solar energy concentrators arc lamps light reflection mirrors The ETH’s High-Flux Solar...
Journal Articles
Article Type: Solar Scenery
J. Sol. Energy Eng. August 2002, 124(3): 205.
Published Online: August 1, 2002
...Mithra Sankrithi 01 08 2002 solar power stations solar absorber-convertors solar energy concentrators thermal power stations mirrors A proof-of-concept subscale prototype of a lightweight, low-cost inflatable heliostat features a spherical inflatable structure with a...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. February 2002, 124(1): 83–86.
Published Online: July 1, 2001
...-convertors solar energy concentrators mirrors In order to popularize the evacuated tubular collectors, we must decrease the price and weight per collector area as well as increase the collector efficiency. The evacuated double glass tube (EDGT) for ETC is composed of a cylindrical absorber...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. February 2002, 124(1): 51–54.
Published Online: June 1, 2001
... other researchers: 1) It allows the use of parabolic mirrors, which have a reflecting area much smaller for a given concentration ratio and acceptance angle. 2) Between the mirror and the absorber, there is a large gap so that conduction losses are reduced. Convection losses can be reduced, too, if the...