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A Transient Thermography Method to Separate Heat Loss Mechanisms in Parabolic Trough Receivers

Röger, Marc und Potzel, Peter und Pernpeintner, Johannes und Caron, Simon (2014) A Transient Thermography Method to Separate Heat Loss Mechanisms in Parabolic Trough Receivers. Journal of Solar Energy Engineering (136), 011006-1. DOI: 10.1115/1.4024739. ISSN 0199-6231.

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Kurzfassung

This paper describes a transient thermography method to measure the heat loss of parabolic trough receivers and separate their heat loss mechanisms. This method is complementary to existing stationary techniques, which use either energy balances or glass envelope temperature measurements to derive overall heat losses. It is shown that the receiver heat loss can be calculated by applying a thermal excitation on the absorber tube and measuring both absorber tube and glass envelope temperature signals. Additionally, the emittance of the absorber selective coating and the vacuum quality of the annulus can be derived. The benefits and the limits of the transient method are presented and compared to the established stationary method based on glass envelope temperature measurements. Simulation studies and first validation experiments are described. A simulation based uncertainty analysis indicates that an uncertainty level of approximately 5% could be achieved on heat loss measurements for the transient method introduced in this paper, whereas for a conventional stationary field measurement technique, the uncertainty is estimated to 17–19%.

Dokumentart:Zeitschriftenbeitrag
Titel:A Transient Thermography Method to Separate Heat Loss Mechanisms in Parabolic Trough Receivers
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Röger, Marcmarc.roeger@dlr.de
Potzel, Peterp.potzel@web.de
Pernpeintner, Johannesjohannes.pernpeintner@dlr.de
Caron, Simonsimon.caron@dlr.de
Datum:Februar 2014
Erschienen in:Journal of Solar Energy Engineering
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI :10.1115/1.4024739
Seitenbereich:011006-1
ISSN:0199-6231
Status:veröffentlicht
Stichwörter:parabolic trough receiver, heat loss measurement, transient thermography, numerical modeling, uncertainty analysis
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:Konzentrierende Solarsysteme
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Qualifizierung (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Solarforschung > Qualifizierung
Hinterlegt von: Anja Kruschinski
Hinterlegt am:07 Aug 2014 15:47
Letzte Änderung:07 Aug 2014 15:47

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