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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 (2014) Transient Infrared Thermography Heat Loss Measurements on Parabolic Trough Receivers Under Laboratory Conditions. SolarPACES Conference 2014, 16.-19. Sept. 2014, Peking, China.

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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 basic measurement principle is to determine the specific heat loss of a receiver by applying a thermal excitation to the absorber tube and measuring the absorber and glass temperature signals with infrared pyrometers. These signals are processed to derive a mean absorber temperature, a mean glass temperature, an amplitude ratio and a phase shift at a certain air temperature. These five measurands are used to identify the 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 9% to 27% 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/91783/
Document Type:Conference or Workshop Item (Speech)
Title:Transient Infrared Thermography Heat Loss Measurements on Parabolic Trough Receivers Under Laboratory Conditions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Caron, SimonUNSPECIFIEDhttps://orcid.org/0000-0002-7699-8108UNSPECIFIED
Röger, MarcUNSPECIFIEDhttps://orcid.org/0000-0003-0618-4253UNSPECIFIED
Pernpeintner, JohannesUNSPECIFIEDhttps://orcid.org/0000-0003-4895-6135139013574
Date:16 September 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Parabolic Trough Receiver, Transient Infrared Thermography, Heat Loss Measurement
Event Title:SolarPACES Conference 2014
Event Location:Peking, China
Event Type:international Conference
Event Dates:16.-19. Sept. 2014
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:11 Nov 2014 13:38
Last Modified:03 Aug 2023 11:24

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