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

Röger, Marc and Potzel, Peter and Pernpeintner, Johannes and 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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Abstract

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%.

Document Type:Article
Title:A Transient Thermography Method to Separate Heat Loss Mechanisms in Parabolic Trough Receivers
Authors:
AuthorsInstitution or Email of Authors
Röger, Marcmarc.roeger@dlr.de
Potzel, Peterp.potzel@web.de
Pernpeintner, Johannesjohannes.pernpeintner@dlr.de
Caron, Simonsimon.caron@dlr.de
Date:February 2014
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1115/1.4024739
Page Range:011006-1
ISSN:0199-6231
Status:Published
Keywords:parabolic trough receiver, heat loss measurement, transient thermography, numerical modeling, uncertainty analysis
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Anja Kruschinski
Deposited On:07 Aug 2014 15:47
Last Modified:07 Aug 2014 15:47

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