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Transient infrared thermography heat loss measurements on parabolic trough receivers under laboratory conditions

Caron, Simon and Röger, Marc and Pernpeintner, Johannes (2015) Transient infrared thermography heat loss measurements on parabolic trough receivers under laboratory conditions. Energy Procedia (69), pp. 310-319. Elsevier. DOI: 10.1016/j.egypro.2015.03.035 ISSN 1876-6102

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Abstract

This paper describes a transient infrared thermography heat loss measurement method for parabolic trough receivers and its development under laboratory conditions. The method is designed for future field measurements and represents a complementary approach to steady-state heat loss measurement methods. The receiver specific heat loss is determined by applying a thermal excitation to the absorber tube and by measuring both the absorber and glass temperature response signals with infrared pyrometers. These transient signals are processed to derive a mean absorber temperature, a mean glass temperature, an amplitude ratio and a phase shift at a mean air temperature. Temperature signals are used to identify receiver thermal properties with the help of a numerical heat transfer model coupled to a parameter identification algorithm. Parabolic trough receivers with distinct absorber coating and annulus properties have been tested with two different transient excitation profiles, i.e. sinusoidal and ramp-and-hold signals. The identified receiver thermal properties have been compared to steady-state heat loss experiments conducted with DLR THERMOREC test bench. The observed specific heat loss deviations between steady-state and transient laboratory measurements respectively range from 2% to 4% for evacuated receivers with selective coating and from 1% to 9% for receivers with black painted absorbers.

Item URL in elib:https://elib.dlr.de/96908/
Document Type:Article
Title:Transient infrared thermography heat loss measurements on parabolic trough receivers under laboratory conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Caron, Simonsimon.caron (at) dlr.deUNSPECIFIED
Röger, Marcmarc.roeger (at) dlr.deUNSPECIFIED
Pernpeintner, Johannesjohannes.pernpeintner (at) dlr.deUNSPECIFIED
Date:May 2015
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.1016/j.egypro.2015.03.035
Page Range:pp. 310-319
Publisher:Elsevier
ISSN:1876-6102
Status:Published
Keywords:Parabolic Trough Receiver, Transient Infrared Thermography, Heat Loss Measurement
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualification (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:30 Jun 2015 13:07
Last Modified:06 Sep 2019 15:22

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