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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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 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/ | ||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||
Title: | Transient Infrared Thermography Heat Loss Measurements on Parabolic Trough Receivers Under Laboratory Conditions | ||||||||||||||||
Authors: |
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Date: | 16 September 2014 | ||||||||||||||||
Refereed publication: | No | ||||||||||||||||
Open Access: | No | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | No | ||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||
Status: | Published | ||||||||||||||||
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 | ||||||||||||||||
Organizer: | SolarPACES | ||||||||||||||||
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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