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Topic: Trough concentrator

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In the News (Wed 21 Aug 19)

A trough captures sunlight over a large aperture area and concentrates this energy onto a much small receiver area, multiplying the intensity of the sun by a concentration ratio in the range of 30-80.
The receiver of a trough concentrator is typically a metal absorber surrounded by a glass tube.
Troughs are aimed at commercial and industrial markets, but they can be configured in any reasonable collector area to meet the desired load.
www.socal-solar-energy.com /Troughs.htm   (848 words)

 Radiant energy collection - Patent 4003638
The concentrative capability of the collector, i.e., the ratio of exit aperture transverse dimension d.sub.2 to entrance aperture transverse dimension d.sub.1, is equal to the sine of the half field of view (.theta.) of the trough.
The maximum angle of acceptance (critical angle) for trough 25 would be equal to the inverse sine of the index of refraction of the medium filling trough 21 divided by the index of refraction of the medium filling trough 26, i.e.
With respect to trough 21, since the exit aperture 23 transverse dimension is equal to 1.5 inches and the desired maximum angle of acceptance is equal to 16.degree., the transverse dimension, d.sub.1, of the entrance aperture 22 would be 5.4 inches and the overall height would be 12 inches.
www.freepatentsonline.com /4003638.html   (5620 words)

 Parabolic trough - Wikipedia, the free encyclopedia
Sunlight is reflected by the mirror and concentrated on the Dewar tube.
The trough is usually aligned on a north-south axis, and rotated to track the sun.
Current commercial plants utilizing parabolic troughs are hybrids, fossil fuels are used during night hours, but the amount of fossil fuel used is limited to a maximum 25% of electricity production, so that the plant qualifies as a renewable energy source.
en.wikipedia.org /wiki/Trough_concentrator   (290 words)

 Light-weight-trough type solar concentrator shell - Patent 4243019
A parabolic cylindrical trough solar concentrator shell is disclosed having a pair of oppositely disposed end support members jointed by spanning structural support members which may be in the form of individual elongated generally triangular polygon members to form the parabolic cylindrical trough.
Thus, the solar radiation striking the area of the trough is reflected and concentrated on the surface of the conduit 15.
The concentrated solar heat is transferred to the wall of the member 16 to a heat transfer fluid circulated therein in conventional fashion.
www.freepatentsonline.com /4243019.html   (2060 words)

 Chapter 8
Concentrating collectors reduce the area of the receiver by reflecting (or refracting) the light incident on a large area (the collector aperture) onto an absorber of small area.
Optical concentration ratio relates directly to lens or reflector quality; however, in many collectors the surface area of the receiver is larger than the concentrated solar image.
This type of concentrator is a flat-plate collector surrounded by mirrors that reflect sunlight incident outside the normal perimeter of the flat plate onto the absorber plate of the collector.
www.powerfromthesun.net /Chapter8/Chapter8new.htm   (3499 words)

 Chapter 9
The concentrating ability of the CPC can be understood through the use of ray tracing diagrams.  The off-axis optics of parabolic troughs were discussed briefly in Chapter 8.  That discussion is expanded here in order to explain the concentrating ability of the CPC.
The parabolic trough subsystem illustrated in Figure 9.12 is constructed from parabolic trough reflector panels 1.0 m long with an aperture width of 2.0 m.  Six 90° rim angle reflector panels are then mounted on a steel torque tube 6.0 m in length, and the torque tube, in turn, is mounted on steel pylons.
Figure 9.17 shows a prototype parabolic trough concept in which the reflector panel is simply a parabolic glass mirror supported by two stamped sheet metal ribs.  This concept, referred to as the spaceframe concept, is potentially attractive since it reduces the reflector structure to the reflector itself with a minimum of other structural components.
www.powerfromthesun.net /Chapter9/Chapter9new.htm   (3615 words)

 Solar Thermal Group - Concentrating Solar Thermal Systems   (Site not responding. Last check: 2007-10-31)
Non imaging concentrators have not found application as the “primary” means of concentration for Solar Thermal Power systems but they are frequently applied as “secondary concentrators” at the focus of central receivers, dishes or troughs, where they serve to further reduce the size of the focal region.
At the bottom a further non imaging concentrator concentrates it further before it is captured by a volumetric receiver capable of heating air to very high temperatures needed for a Brayton cycle.
The receiver units of the LUZ troughs consist of a stainless steel tube 70mm in diameter, covered by a Pyrex glass envelope which is sealed to the tube via metal belows at the ends.
engnet.anu.edu.au /DEresearch/solarthermal/pages/basics.php   (4094 words)

 PAPER - Online Information article about PAPER   (Site not responding. Last check: 2007-10-31)
A special form of concentrator is fixed on the top of the first tower, which reduces the water in the pulp as it leaves the potcher to the minimum quantity necessary for per- fect circulation in the tower; by this means a considerable saving is effected in the quantity of bleach required.
When the pulp is fully bleached in the last tower of the series, fresh water is run into it, and a second concentrator, similar to the one on the first tower, is put in motion and washes out all traces of the bleach in about 25 to 30 minutes.
Live steam is introduced into the chamber surrounding the tubes of the first effect, and from the separator of the last effect the concentrated liquor is pumped to the incinerator.
encyclopedia.jrank.org /PAI_PAS/PAPER.html   (8226 words)

 A Solar Concentrator Compendium
One option is to employ concentrating optics, which gather sunlight with lenses, thereby increasing the intensity of sunlight striking the PV cell.
Concentrating solar power plants produce electric power by first converting the sun's energy into heat, and then to electricity in a conventional generator...
Using trough, dish, or central receiving collectors, solar thermal electric power plants concentrate sunlight to achieve temperatures in excess of 600 deg.
www.ecoworld.com /Home/Articles2.cfm?TID=288   (509 words)

 SoLNrG.com - Articles - Thermal Solar Electricity - Overview of three types of thermal solar electricity generation
The use of parabolic reflecting systems maximises the concentrating ratio of the system by ensuring that all reflected light focuses on the receiver which is positioned at the focal point.
Trough systems can either be orientated horizontally, in long rows, like the Luz system in California, or vertically, like the demonstration system in Canberra.
Parabolic dish concentrating systems use parabolic dish shaped mirrors to focus incoming solar radiation onto a receiver which is positioned at the focal point of the dish.
www.solnrg.com /catalog/article_info.php/articles_id/5   (938 words)

 Research in the ENERGY GROUP
A parabolic trough concentrator with aperture 200 mm and focal length of 50 mm was constructed and tested with and without water as the filling liquid.
Unlike most concentrators, because of the nature of the heat pipe, the alignment of the axial plane of the concentrator had to be in north-south direction.
The theoretical analysis and the experimental tests showed that the performance of the concentrator was much better than that of the evacuated tube alone within the range of the acceptance angle of the concentrator.
www.rdg.ac.uk /energy/book/msc98b.html   (912 words)

 Learn more about Solar power in the online encyclopedia.   (Site not responding. Last check: 2007-10-31)
A solar thermal power plant has a system of mirrors to concentrate the sunlight on to an absorber, the energy then being used to drive turbines or a thermocouple.
The concentrator is usually a parabolic mirror in the form of a dish or long trough, oriented so as to track the Sun's path through the day.
The absorber is located at the focal point and converts the solar radiation to heat (about 400°C) which is transferred into a fluid such as synthetic oil or sulfur.
www.onlineencyclopedia.org /s/so/solar_power.html   (1016 words)

 Solar Tracker "TRAXLE"
On single axis trackers, both horizontal and polar, the mirror have to be extended beyond PV panels to ensure uniform illumination of panels at seasonaly variable elevation of the sun.
Concentration ratio (1.5-1.7) reduces temperature of PV panels (higher efficiency) and avoids degradation of the encapsulant.
Concentration ratio (2-2.4) of standard V-trough concentrators frequently causes browning of the EVA encapsulant while elevated temperature reduces efficiency of PV panels.
www.solar-trackers.com /conc-deu.htm   (672 words)

 The Energy Blog: About Parabolic Trough Solar
Trough solar systems use parabolic curved, trough shaped reflectors focus the sun's energy onto a receiver pipe running at the focus of the reflector.
Trough collector solar power, also called solar electric generating systems (SEGS), represent the most mature concentrating solar power (CSP) technology, with 354 MW of installed capacity in nine plants, built between 1984 and 1991, all located in the Mohave desert of California.
PSA is also developing new trough collector assemblies and coatings to improve the absorption of solar energy on the receiver tubes and to decrease the reflectivity of glass.
thefraserdomain.typepad.com /energy/2005/09/about_parabolic.html   (3353 words)

 Linear Concentrator Research at the Australian National University
The solar cells are illuminated with approximately 20 times normal solar concentration, and convert about 20% of the sunlight into electricity.
The balance of the solar energy is converted into heat, which is removed via water flowing in a channel behind the solar cells and stored for later use in a ground-mounted tank.
Concentrator solar cell receivers for use with parabolic trough concentrator systems have been developed.
solar.anu.edu.au /level_1/research/linearconc.php   (593 words)

This paper, which is a continuation of Estrada et al (1), presents theoretical advances of the research focused on the determination of the optimal shape of the receiver and the thermal losses associated.
The pick local concentration for the cylindrical receiver was found to be 2040 sun and the geometrical concentration was 860 suns.
With these concentrations it is possibly to think in temperatures as high as 1000 K or even greater.
www.kenes.com /Ises.Abstracts/Htm/0269.htm   (339 words)

 pvresources - solar trackers and concentrators
Polar axis solar tracker and/or tracking concentrator is always mounted on high support structures (to avoid contact of the rotating PV array with the ground).
The Rockingham concentrator PV system was constructed by ANU and Solahart and commenced in November 1999.
Four components were the basis of this new technology: concentration modules, concentration optics, heat sinks and structure and tracking.
www.pvresources.com /en/concentrator.php   (1154 words)

 Solar Energy
Commercial trough systems can be competitive with natural gas and will deliver energy at a cost not influenced by outside events for more than 20 years.
The solar field consists of 120 parabolic trough concentrator modules with a total gross collectorarea of 18,000 square feet (17,000 square feet net area).
Reflected solar energy is focused by the parabolic concentrator onto the receiver at the focal point.
www.industrialsolartech.com /trghtech.htm   (990 words)

 Mold for Parabolic Trough Mirror
Note:  The Mylar acts as a mold release for the completed trough.  The epoxy resin never actually touches the mold since the mold is 100% covered with the Mylar so there is no mold release problem.
I extensively use early incremental testing of concepts to isolate and prove the physics and components of larger designs.    What you see here is a very rough version built around the first mold component slice produced by our CNC mill.   It performed better than I would have hoped given the sub optimal test conditions.
While this test did not reach temperatures that would indicate 12 suns worth of concentration it is sufficient to indicate that the core design is sound and that  a version produced under more rigorous quality control will do even better.     Our next test will be 4 foot long and use an electronic aiming system.
xdobs.com /cnc/proj_parabolic_mold/index.htm   (1574 words)

 Trough   (Site not responding. Last check: 2007-10-31)
The ANU has also recently constructed a 1.5-m aperture width trough concentrator design for use with photovoltaic concentrator systems.
Test the operation of a trough driven ammonia dissociation receiver-reactor using Ruthenium on Carbon catalyst.
The project has lead to the development of a new double aperture width trough module that has shown considerably higher optical performance and is capable of reaching temperatures in excess of 500°C, with a simple cavity receiver.
www.solarpaces.org /TROUGHAM.HTM   (315 words)

 US-Trough   (Site not responding. Last check: 2007-10-31)
The objective of the USA Trough Initiative is to help develop a US trough industry that will be better positioned to compete in domestic and international trough projects.
Nexant has developed a near-term thermal storage option for parabolic trough technology that uses biphenyl-diphenyl-oxide HTF in the solar field and then passes it through a heat ex-changer to heat molten salt (the same “solar salt” used at Solar Two) in a thermal storage system.
Kearney and Associates is investigating using a lower temperature molten salt as the HTF in the solar field as an innovative approach for reducing the cost of thermal storage for troughs.
www.solarpaces.org /US_TROUGH.HTM   (422 words)

 concentrator design   (Site not responding. Last check: 2007-10-31)
Duke Solar is developing a new concentrator design, and Industrial Solar Technology is looking at ways to improve its trough concentrator to make it more...
The solar wind concentrator design is mature and ready for flight.
concentrator design that is the result of a collaboration between H2GO/Solfocus of.
www.settepercento.it /casa/concentrator-design.htm   (711 words)

 Synergy Vol 4 No 3: Spring 2000
The concentrated solar intensity on the solar cells is 25 times greater than normal, which means that 25 times fewer solar cells are needed to obtain the required electrical power output.”
Whilst only at demonstration stage, it is expected that the Photovoltaic Trough Concentrator system will be in a competitive position to fill the demand in the remote area power supply market as restrictions are implemented on fossil fuel based technologies, such as diesel, in the future.
The photovoltaic trough concentrator system is an ideal example of what can happen when researchers, government and research users work together.
wwwcomm.murdoch.edu.au /synergy/0403/concsun.htm   (535 words)

 [SOLAR] Trough concentrator Hot-pipe insulation
With the mirror curvature, it reduced the concentration factor to about 45, but that depends on the mirror quality.
So far I am almost at 600F with a concentration factor of 26...
I would suggest using glass or pyrex tubing around your pipe > Hello all, > I have been continuing my work on improving my trough concentrator > prototype, and wanted to get some feedback regarding what everyone else is > doing with their focal target (In my case, a 1/2" - 3/4" fl copper pipe).
www.cichlid.com /pipermail/solar-concentrator/2001q4/001377.html   (668 words)

 Centre for Sustainable Energy Systems   (Site not responding. Last check: 2007-10-31)
Over the last five years the Centre has developed a range of parabolic trough solar concentrators fitted with photovoltaic collectors.
A photovoltaic/trough concentrator system for the production of electricity in remote areas has been developed, in conjunction with Solahart Industries Pty Ltd.
The balance of the solar energy is converted into heat, which is removed via a finned aluminium heat exchanger.
pv.anu.edu.au /pages/concentrator.html   (200 words)

 ANU Solar Trough Concentrator system   (Site not responding. Last check: 2007-10-31)
The sun tracking parabolic concentrating photovoltaic trough system (phew) operates at 60°C while delivering the equivalent of 22 suns to the silicon surface.
A photovoltaic trough concentrator system, developed at ANU and trialed outside Canberra, is being scaled up to a 20kW demonstration plant.
The sun tracking parabolic mirrored troughs concentrate the sunlight by a factor of 22 times onto solar cells suspended along the focal line of the mirror.
happy.emu.id.au /neilp/solar/solartrough.htm   (291 words)

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