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Multiple Air-Jet Window Cooling for High-Temperature Pressurized Volumetric Receivers: Testing, Evaluation, and Modeling

Röger, Marc und Pfänder, Markus und Buck, Reiner (2006) Multiple Air-Jet Window Cooling for High-Temperature Pressurized Volumetric Receivers: Testing, Evaluation, and Modeling. Journal of Solar Energy Engineering, 128 (3), Seiten 265-274.

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Offizielle URL: http://scitation.aip.org/dbt/dbt.jsp?KEY=JSEEDO&Volume=128&Issue=3

Kurzfassung

High air outlet temperatures increase the solar share of pressurized solar receivers for gas turbines, operated in solar-fossil hybrid mode. However, an increase in outlet temperature over 800°C leads to excessive heating of the receiver window, unless it is actively cooled. This paper describes modeling, testing and evaluation of a high-temperature receiver with external multiple air-jet window cooling. An asymmetric window-cooling design with pulsating air mass flow rates achieves suitable cooling of the concave fused-silica window. A thermodynamic receiver model, comprising non-gray radiative heat transfer, convection and conduction is the basis of the external window cooling design. In addition to high-temperature testing with window cooling in operation, solar tests at lower temperatures with no window cooling were conducted to verify the thermodynamic receiver model. Temperature distributions on the quartz window and the absorber were determined by an infrared (IR) scanner which was specially developed for temperature measurement on the high-temperature module. Comparisons of simulations and measurements show good agreement. With multiple air-jet window cooling, receiver air outlet temperatures over 1000°C could be reached, while window temperatures are kept below 800°C.

Dokumentart:Zeitschriftenbeitrag
Titel:Multiple Air-Jet Window Cooling for High-Temperature Pressurized Volumetric Receivers: Testing, Evaluation, and Modeling
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Röger, MarcNICHT SPEZIFIZIERT
Pfänder, MarkusNICHT SPEZIFIZIERT
Buck, ReinerNICHT SPEZIFIZIERT
Datum:August 2006
Erschienen in:Journal of Solar Energy Engineering
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:128
Seitenbereich:Seiten 265-274
Status:veröffentlicht
Stichwörter:solar tower power plant, high-temperature, pressurized volumetric receiver, fused-silica window, cooling, jet flow, pulsating, concave surface
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:E SF - Solarforschung (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Solare Hochtemperatursysteme (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Solarforschung
Hinterlegt von: Marc Röger
Hinterlegt am:20 Nov 2006
Letzte Änderung:27 Apr 2009 13:03

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