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Heat Flux and Temperature Measurements on Glass Envelope and Bellows of Parabolic Trough Receivers

Caron, Simon and Röger, Marc and Pernpeintner, Johannes (2018) Heat Flux and Temperature Measurements on Glass Envelope and Bellows of Parabolic Trough Receivers. In: AIP Conference Proceedings, 2033 (030004). SolarPACES 2017, 26.-20. Sep. 2017, Santiago de Chile. DOI: 10.1063/1.5067020

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Official URL: https://aipscitation.org/doi/10.1063/1.5067020

Abstract

This paper reports heat flux measurements on parabolic trough receivers, which are integrated to calculate the receiver overall heat loss. Integrated heat fluxes yield an overall heat loss value which agrees with DLR ThermoRec heat loss measurements within ± 5 %, in the simplified case of assuming a homogeneous heat flux distribution around the receiver circumference. Heat flux measurements also allow separating glass envelope and shielded bellow heat loss terms for receiver thermal modelling. Shielded bellows only represent 3 to 4 % of the receiver total length at ambient temperature, however heat flux measurements show that their contribution to the overall receiver heat loss ranges from 5 to 15 %, depending on the shield construction and the absorber temperature. The receiver specific heat loss thus tends to lie above the glass envelope specific heat loss. Almost homogeneous heat flux values are measured along the glass envelope length (variation below 5 %), while more inhomogeneous heat flux values are observed over circumference of the glass envelope (variation between top and side of 17 %). The measurement setup analysis shows a good repeatability, although a proper mounting of heat flux sensors is important in order to avoid systematic biases.

Item URL in elib:https://elib.dlr.de/115408/
Document Type:Conference or Workshop Item (Speech)
Title:Heat Flux and Temperature Measurements on Glass Envelope and Bellows of Parabolic Trough Receivers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Caron, SimonSimon.Caron (at) dlr.dehttps://orcid.org/0000-0002-7699-8108
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Pernpeintner, JohannesJohannes.Pernpeintner (at) dlr.deUNSPECIFIED
Date:8 November 2018
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:2033
DOI :10.1063/1.5067020
Status:Published
Keywords:Parabolic trough, Receiver, Bellows, Heat flux measurement, Temperature measurement
Event Title:SolarPACES 2017
Event Location:Santiago de Chile
Event Type:international Conference
Event Dates:26.-20. Sep. 2017
Organizer:SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2017 14:04
Last Modified:08 Nov 2019 03:00

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