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Strategies enhancing efficiency of cavity receivers

Uhlig, Ralf und Flesch, Robert und Gobereit, Birgit und Giuliano, Stefano und Liedke, Phillip (2014) Strategies enhancing efficiency of cavity receivers. Energy Procedia, 49, Seiten 538-550. Elsevier. doi: 10.1016/j.egypro.2014.03.058. ISSN 1876-6102.

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Kurzfassung

Introducing solar energy into the gas turbine of Combined Cycle systems (CC) offers significant advantages over other solar power plant concepts. A promising way to introduce solar power is solar preheating of the compressor discharge air before it enters the combustor of the gas turbine using a receiver built consisting of several metallic tubes. The main challenge during the design of such a receiver is the low solar flux capability caused by the limited convective heat transfer. To ensure a sufficient efficiency, the receiver is usually located in a cavity. The heat losses by conduction through the (insulated) cavity walls can be reduced by increased insulation thickness. Heat losses by radiation and convection to ambient depend strongly on the aperture area, receiver inclination and the receiver temperature. The receiver temperatures can be reduced by increasing the cavity si ze, as the flux distribution gets more homogenous and the overall flux density is reduced. Following heat losses by radiation and convection to ambient are reduced. On the other hand additional costs for the cavity walls have to be considered. The paper deals with the comparison of two different strategies to increase the receiver efficiency of a cavity receiver used to heat the compressed air of a 4.7 MWel turbine from 330°C up to 800°C, with a mass flow of 15.9 kg/s at 10 barabs. The influence on the levelized cost of energy (LCOE) of different receiver sizes and one design option (transparent covering of aperture) for reducing the convections losses were analyzed and compared. The thermal and hydraulic layout was done for a thermal heat of 8.4MWth and 250 mbar pressure drop using thermal finite element (FE) models considering the local heat flux distribution, heat transfer to working fluid, radiation exchange between components and ambient as well as conduction and convection losses of the cavity. As the convective losses play a significant role, CFD models were used to evaluate the convective heat losses.

elib-URL des Eintrags:https://elib.dlr.de/91849/
Dokumentart:Zeitschriftenbeitrag
Titel:Strategies enhancing efficiency of cavity receivers
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Uhlig, RalfRalf.Uhlig (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Flesch, RobertRobert.Flesch (at) dlr.dehttps://orcid.org/0000-0003-2725-8039NICHT SPEZIFIZIERT
Gobereit, BirgitBirgit.Gobereit (at) dlr.dehttps://orcid.org/0000-0002-1952-9209NICHT SPEZIFIZIERT
Giuliano, Stefanostefano.giuliano (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Liedke, PhillipPhillip.Liedke (at) dlr.dehttps://orcid.org/0000-0003-3391-8638NICHT SPEZIFIZIERT
Datum:2014
Erschienen in:Energy Procedia
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Band:49
DOI:10.1016/j.egypro.2014.03.058
Seitenbereich:Seiten 538-550
Verlag:Elsevier
Name der Reihe:Elsevier Ltd.
ISSN:1876-6102
Status:veröffentlicht
Stichwörter:lar tower; Combined Cycle, Tubular receiver; Convection losses; Window
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:Konzentrierende Solarsysteme (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Punktfokussierende Systeme (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Solarforschung > Punktfokussierende Systeme
Hinterlegt von: Uhlig, Tamara
Hinterlegt am:11 Nov 2014 16:26
Letzte Änderung:06 Nov 2023 14:52

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