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Steady state calorimetric measurement of total hemispherical emittance of cylindrical absorber samples at operating temperature

Effertz, Timo und Pernpeintner, Johannes und Schiricke, Björn (2017) Steady state calorimetric measurement of total hemispherical emittance of cylindrical absorber samples at operating temperature. In: AIP Conference Proceedings, 1850, 020003-01-020003-07. Elsevier. 22nd SolarPACES Conference, 2016-10-11 - 2016-10-14, Abu Dhabi, UAE. doi: 10.1063/1.4984327. ISBN 978-0-7354-1522-5. ISSN 0094-243X.

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Offizielle URL: http://aip.scitation.org/toc/apc/1850/1?expanded=1850

Kurzfassung

At DLR’s QUARZ Center a test bench has been established to measure, using steady state calorimetric method, the total hemispherical emittance of cylindrical solar thermal absorber samples at temperatures up to 450 °C. Emittance measurement of solar absorber surfaces is commonly performed by direct-hemispherical reflectance measurements with spectrophotometers. However, the measurement of cylindrical samples with spectrophotometers can be considered still a challenge as integrating spheres, reference samples and calibration services by national metrology institutions are optimized for flat sample measurement. Additionally samples are typically measured at room temperature. The steady state calorimetric method does not rely on reference samples and the measurement is performed at operating temperature. In the steady state calorimetric method electrical power input used to heat the sample is equated to the radiative heat loss from a heated sample to the environment. The total emittance can be calculated using the Stefan-Boltzmann equation from radiative heat loss power, the defined sample surface area and measured surface temperature. The expanded uncertainty (k=2) of the total hemispherical emittance has been determined to ±13 % for a typical parabolic trough absorber sample at a temperature of 300 °C and a heating power of 100 W. The test bench was validated by the measurement of three samples with the spectrophotometer and the steady state calorimetric method.

elib-URL des Eintrags:https://elib.dlr.de/108843/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Steady state calorimetric measurement of total hemispherical emittance of cylindrical absorber samples at operating temperature
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Effertz, TimoTimo.Effertz (at) dlr.dehttps://orcid.org/0000-0002-9152-4656NICHT SPEZIFIZIERT
Pernpeintner, JohannesJohannes.Pernpeintner (at) dlr.dehttps://orcid.org/0000-0003-4895-6135NICHT SPEZIFIZIERT
Schiricke, BjörnBjoern.Schiricke (at) dlr.dehttps://orcid.org/0000-0003-0572-2048NICHT SPEZIFIZIERT
Datum:Juni 2017
Erschienen in:AIP Conference Proceedings
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Band:1850
DOI:10.1063/1.4984327
Seitenbereich:020003-01-020003-07
Verlag:Elsevier
ISSN:0094-243X
ISBN:978-0-7354-1522-5
Status:veröffentlicht
Stichwörter:Total Hemispherical Emittance, Emittance, Calorimetric Measurement, Steady State, Emissionsgrad, Hemisphärischer Emissionsgrad,
Veranstaltungstitel:22nd SolarPACES Conference
Veranstaltungsort:Abu Dhabi, UAE
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:11 Oktober 2016
Veranstaltungsende:14 Oktober 2016
Veranstalter :SolarPACES
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:Konzentrierende solarthermische Technologien
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Einfluss von Wüstenbedingungen (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Solarforschung > Qualifizierung
Hinterlegt von: Kruschinski, Anja
Hinterlegt am:05 Dez 2016 14:31
Letzte Änderung:24 Apr 2024 20:14

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