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Optical Performance of Segmented Aperture Windows for Solar Tower Receivers

Buck, Reiner (2017) Optical Performance of Segmented Aperture Windows for Solar Tower Receivers. In: AIP Conference Proceedings. SolarPACES 2016, 1.-14. Okt. 2016, Abu Dhabi, AE.

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Abstract

Segmented quartz windows are a concept to build larger windows for receivers that require a closed aperture. Reflection losses are a significant loss factor for such solar receivers. Without any additional measures, the reflection loss can reach about 12%. One important measure to improve transmission is the application of anti-reflective coatings, which is beneficial in any case. Another option is modifying the window geometry, especially the edge surfaces of the glass segments. A certain fraction of the reflection losses are caused by a light-guide effect in the glass body, for rays entering through the front surface. Changing the cut surfaces in a way reducing the light-guide effect can significantly improve transmission of a segmented window. Several possible configurations are evaluated and discussed. The results of raytracing simulations verify the improvement. The final selection of the window configuration depends on the optical properties and on mechanical strength, anufacturing and cost considerations. This has to be evaluated for any specific receiver design.

Item URL in elib:https://elib.dlr.de/115941/
Document Type:Conference or Workshop Item (Speech)
Title:Optical Performance of Segmented Aperture Windows for Solar Tower Receivers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Buck, ReinerReiner.Buck (at) dlr.deUNSPECIFIED
Date:April 2017
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:Optical Performance of Segmented Aperture Windows for Solar Tower Receivers
Event Title:SolarPACES 2016
Event Location:Abu Dhabi, AE
Event Type:national Conference
Event Dates:1.-14. Okt. 2016
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
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Uhlig, Tamara
Deposited On:30 Nov 2017 12:30
Last Modified:06 Dec 2017 10:34

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