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Journal ArticleDOI: 10.1080/15567036.2020.1751745

Effect of aspect ratio of heliostats on the optical efficiency of solar tower power plant–an experimental analysis

22 Apr 2020-Energy Sources Part A-recovery Utilization and Environmental Effects (Taylor and Francis Inc.)-pp 1-18
Abstract: Concentrated solar power tower (CSPT) technology coupled with molten salt thermal storage is a very promising approach to harness solar energy as it offers good efficiency along with cheap storage ...

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Topics: Concentrated solar power (66%), Solar energy (65%), Power tower (64%) ...read more
Citations
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Journal ArticleDOI: 10.1080/15567036.2020.1784318
Abstract: The solar tower power plant (STPP) is one of the most renowned technologies for large-scale renewable electricity production The solar field of STPP is made up of several hundreds of mirrors, know

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Topics: Heliostat (62%), Renewable energy (62%), Power station (54%) ...read more
References
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Journal ArticleDOI: 10.1126/SCIENCE.162.3856.857
Peter E. Glaser1Institutions (1)
22 Nov 1968-Science
Topics: Energy source (70%), Renewable energy (69%), Solar energy (61%) ...read more

669 Citations


Journal ArticleDOI: 10.1115/1.1565087
David Kearney, Ulf Herrmann, P. Nava, Bruce Kelly  +6 moreInstitutions (1)
Abstract: An evaluation was carried out to investigate the feasibility of utilizing a molten salt as the heat transfer fluid (HTF) and for thermal storage in a parabolic trough solar field to improve system performance and to reduce the levelized electricity cost. The operating SEGS (Solar Electric Generating Systems located in Mojave Desert, California) plants currently use a high temperature synthetic oil consisting of a eutectic mixture of biphenyl/ diphenyl oxide. The scope of this investigation included examination of known critical issues, postulating solutions or possible approaches where potential problems exist, and the quantification of performance and electricity cost using preliminary cost inputs. The two leading candidates were the so-called solar salt (a binary salt consisting of 60% NaNO 3 and 40% KNO 3 ) and a salt sold commercially as HitecXL (a ternary salt consisting of 48% Ca(NO 3 ) 2 , 7% NaNO 3 , and 45% KNO 3 ). Assuming a two-tank storage system and a maximum operation temperature of 450°C, the evaluation showed that the levelized electricity cost can be reduced by 14.2% compared to a state-of-the-art parabolic trough plant such as the SEGS plants. If higher temperatures are possible, the improvement may be as high as 17.6%. Thermocline salt storage systems offer even greater benefits.

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Topics: Parabolic trough (63%), Thermal energy storage (60%), Molten salt (58%) ...read more

377 Citations


Journal ArticleDOI: 10.1080/00908319808970052
D. Yogi Goswami1Institutions (1)
01 Feb 1998-Energy Sources
Abstract: This article reviews some recent developments in thermodynamic cycles as well as new and innovative thermal power cycles applicable to solar thermal power

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Topics: Grid parity (64%), Wind power (60%), Energy development (55%) ...read more

151 Citations


Journal ArticleDOI: 10.1016/J.RENENE.2012.03.011
Francisco J. Collado1, Jesus Guallar1Institutions (1)
01 Oct 2012-Renewable Energy
Abstract: The main problem in the full design and optimization of heliostats fields for Solar Power Tower (SPT) systems is the recalculation of the shadings and blockings for each heliostat in the field at every stage of the optimization process while the layout is being modified. To make easier the solution to this complex problem, a new code, called campo , for the design and performance analysis of heliostat fields, is presented in this paper. The code campo , based on the Matlab type cell data structure, is able to generate regular but flexible radial staggered layouts of heliostat fields. A major feature of campo is the ability to perform fast and accurate calculations of the shadowing and blocking factor for each and every one of the heliostats in the field. Further, the data structure of the code allows an efficient selection of the relevant blocking and shading neighbours even while the layout is being changed. Both distinctive features are analysed here in depth. In this new code, the optimization would proceed from densest fields, with the worst shadowing and blocking factor, towards expanded fields. Several options to gradually expand the starting dense layouts are successfully checked. This code would allow a full optimization process in which the thousands of heliostat coordinates would be actually included in the optimum search.

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Topics: Heliostat (59%)

128 Citations


Open accessJournal ArticleDOI: 10.1016/J.SOLENER.2011.06.006
01 Sep 2011-Solar Energy
Abstract: For the layout of solar trackers the wind loads on the structure have to be known. They can be calculated by using wind load coefficients given in literature. But so far these values are only valid for aspect ratios of the panel (width to height) of about 1.0. Therefore the wind load coefficients for heliostats of aspect ratios between 0.5 and 3.0 were determined to close this gap. As solar trackers are exposed to the turbulent atmospheric boundary layer the turbulence of the approaching flow has to be modeled. As a reliable method at reasonable cost wind tunnel measurements were chosen. Solar trackers of 30 m2 panel size were investigated at a model scale of 1:20. Wind direction and elevation angle of the panel were varied to investigate especially the constellations at which the highest wind loads are expected (critical load cases). By spires and roughness elements a wind profile and a turbulence intensity of the modeled wind according to typical sites for solar trackers were achieved. The loads were measured by a high frequency force balance placed underneath the models. Additionally measurements of the pressure distribution on a panel with aspect ratio of 1.2 were performed to better understand the effects that lead to the peak values of the wind load coefficients. A significant impact of the aspect ratio was measured. For the critical load cases the aspect ratio dependencies of the accordant peak wind load components were determined. By these the peak wind loads on solar trackers of varies aspect ratios can be calculated. Regarding the single solar tracker components the main results are: Higher aspect ratios are advantageous for the dimensioning of the foundation, the pylon and the elevation drive but disadvantageous for the azimuth drive.

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  • Figure 13: cFz · dra / dra=1,Pet at load case 2
    Figure 13: cFz · dra / dra=1,Pet at load case 2
  • Figure 21: cMy · dra / dra=1,Pet at load case 4
    Figure 21: cMy · dra / dra=1,Pet at load case 4
  • Figure 22: cMz · dra / dra=1,Pet at load case 3
    Figure 22: cMz · dra / dra=1,Pet at load case 3
  • Table 1: Positions of measuring points for facet A
    Table 1: Positions of measuring points for facet A
  • Figure 8: Sections of pressure measurements at four facets “A” – “D”
    Figure 8: Sections of pressure measurements at four facets “A” – “D”
  • + 22

Topics: Wind profile power law (63%), Wind direction (63%), Wind engineering (61%) ...read more

55 Citations


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