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Air Return Ratio Measurements at the Solar Tower Jülich using a Tracer Gas Method

Tiddens, Arne and Röger, Marc and Stadler, Hannes and Hoffschmidt, Bernhard (2017) Air Return Ratio Measurements at the Solar Tower Jülich using a Tracer Gas Method. Solar Energy. Elsevier. DOI: 10.1016/j.solener.2017.02.027 ISSN 0038-092X

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Official URL: https://orcid.org/10.1016/j.solener.2017.02.027

Abstract

The air return ratio is a key factor for the overall efficiency of the open volumetric receiver concept. Although first measurements of the air return ratio exist for smaller setups of the open volumetric receiver concept, so far no measurement of the air return ratio has been presented for the Solar Thermal Test and Demonstration Power Plant Jülich (~1.5MW, ~10 (kg air)/s; ~700°C). This paper describes the application of a tracer gas method at the Solar Tower Jülich to determine this substantial ARR. As tracer gas the environmentally friendly helium has been chosen. The helium is injected dynamically into the circular air flow of the system and the helium mole fraction is measured using a mass spectrometer. The dynamic concentration response of the system is used to determine the air return ratio. This dynamic method only requires one location of measurement. First measurements with this dynamic method were conducted at the Solar Tower Jülich. The ARR of STJ was measured with and without irradiation of the main receiver with high accuracy. Under low-wind conditions and without irradiation of the main receiver the air return ratio was measured to be (67.7 ± 0.5)% for an air mass flow of (9.96 ± 0.04) kg/s. A slightly higher air return ratio of (68.6 ± 0.7)% was measured under irradiation with an air mass flow of (9.94 ± 0.04) kg/s. The air return ratio was sensitive to the air mass flow, showing significantly lower rates when moving further away from the 10 kg/s design air mass flow to 5 kg/s.

Item URL in elib:https://elib.dlr.de/111337/
Document Type:Article
Title:Air Return Ratio Measurements at the Solar Tower Jülich using a Tracer Gas Method
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tiddens, Arnearne.tiddens (at) dlr.dehttps://orcid.org/0000-0003-3714-3008
Röger, Marcmarc.roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Stadler, Hanneshannes.stadler (at) dlr.deUNSPECIFIED
Hoffschmidt, Bernhardbernhard.hoffschmidt (at) dlr.deUNSPECIFIED
Date:March 2017
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2017.02.027
Editors:
EditorsEmail
Goswami, YogiUNSPECIFIED
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Air return ratio, Tracer gas, Solar Tower Jülich, Solar air receiver, Air receiver, Measurement technique, Dynamic mass spectroscopy
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E MS - Systems analysis
DLR - Research theme (Project):E - Systems Analysis and Technology Assessment (old), E - Impact of Desert Environment (old)
Location: Jülich
Institutes and Institutions:Institute of Solar Research
Institute of Solar Research > Qualification
Deposited By: Tiddens, Arne Tidde
Deposited On:22 May 2017 13:25
Last Modified:31 Jul 2019 20:08

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  • Air Return Ratio Measurements at the Solar Tower Jülich using a Tracer Gas Method. (deposited 22 May 2017 13:25) [Currently Displayed]

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