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Incidence angles on cylindrical receivers of solar power towers

Paret, Tobias W. and Wöhrbach, Markus and Buck, Reiner and Weinrebe, Gerhard (2020) Incidence angles on cylindrical receivers of solar power towers. Solar Energy (201), pp. 1-7. Elsevier. doi: 10.1016/j.solener.2020.02.077. ISSN 0038-092X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X20302048?dgcid=coauthor#!


In order to decrease the levelized cost of energy (LCOE) of solar power towers, efficiencies of all components have to be analyzed and improved. Among them is receiver absorptivity, which depends on the angle of incidence of solar radiation. While cylindrical receivers consist of arrays of vertical tubes, they are usually represented as flat surfaces for the optical part of simulations, imposing different incidence angles. Ray tracing and analytical algorithms for both primary and secondary absorption are used to compare absorptivity values for a detailed tube geometry with the simplified approach. Moreover the effect of horizontal aim point shifting on absorptivity is investigated. Results show that assuming flat surfaces leads to an underprediction of absorptivity of several tenths of a percentage point. A smaller overprediction of the same order of magnitude is reached for assuming entirely perpendicular incidence. Furthermore it is found that spillage losses due to horizontal aim point shifting exceed the effect of implied lower incidence angles by more than one order of magnitude.

Item URL in elib:https://elib.dlr.de/134401/
Document Type:Article
Title:Incidence angles on cylindrical receivers of solar power towers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Paret, Tobias W.Schlaich Bergermann und Partner, StuttgartUNSPECIFIEDUNSPECIFIED
Wöhrbach, MarkusSchlaich Bergermann und Partner, StuttgartUNSPECIFIEDUNSPECIFIED
Weinrebe, GerhardSchlaich Bergermann und Partner, StuttgartUNSPECIFIEDUNSPECIFIED
Date:22 February 2020
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-7
Series Name:Elsevier Ldt
Keywords:Power tower; Central receiver; Incidence angle; Receiver geometry; Absorptivity; Aim point strategy
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Solartowersystems
Deposited By: Uhlig, Tamara
Deposited On:11 Mar 2020 14:26
Last Modified:14 Apr 2020 08:17

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