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Characterization and Corrections for Clamp-On Fluid Temperature Measurements in Turbulent Flows

Nouri, Bijan and Röger, Marc and Janotte, Nicole and Hilgert, Christoph (2018) Characterization and Corrections for Clamp-On Fluid Temperature Measurements in Turbulent Flows. Journal of Thermal Science and Engineering Applications, 10 (031011), pp. 1-11. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4038706 ISSN 1948-5085

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A clamp-on measurement system for flexible and accurate fluid temperature measurements for turbulent flows with Reynolds numbers higher than 30,000 is presented in this paper. This noninvasive system can be deployed without interference with the fluid flow while delivering the high accuracies necessary for performance and acceptance testing for power plants in terms of measurement accuracy and position. The system is experimentally validated in the fluid flow of a solar thermal parabolic trough collector test bench, equipped with built-in sensors as reference. Its applicability under industrial conditions is demonstrated at the 50 MWel AndaSol-3 parabolic trough solar power plant in Spain. A function based on large experimental data correcting the temperature Gradient between the measured clamp-on sensor and actual fluid temperature is developed, achieving an uncertainty below 60.7 K (2r) for fluid temperatures up to 400 C. In addition, the experimental results are used to validate a numerical model. Based on the results of this model, a general dimensionless correction function for a wider range of application scenarios is derived. The clamp-on system, together with the dimensionless correction function, supports numerous combinations of fluids, pipe materials, insulations, geometries, and operation conditions and should be useful in a variety of industrial applications of the power and chemical industry where temporal noninvasive fluid temperature measurement is needed with good accuracy. The comparison of the general dimensionless correction function with measurement data indicates a measurement uncertainty below 1 K (2r).

Item URL in elib:https://elib.dlr.de/120305/
Document Type:Article
Title:Characterization and Corrections for Clamp-On Fluid Temperature Measurements in Turbulent Flows
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nouri, BijanBijan.Nouri (at) dlr.deUNSPECIFIED
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Janotte, Nicolenicole.janotte (at) dlr.deUNSPECIFIED
Hilgert, ChristophChristoph.Hilgert (at) dlr.dehttps://orcid.org/0000-0002-9985-7367
Date:June 2018
Journal or Publication Title:Journal of Thermal Science and Engineering Applications
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1115/1.4038706
Page Range:pp. 1-11
Publisher:American Society of Mechanical Engineers (ASME)
Keywords:temperature measurement, fluid temperature, turbulent flow, PT100, correction function, clamp on system, Performance testing, acceptance testing, CSP, solar power plant, parabolic trough
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:18 Sep 2018 08:30
Last Modified:31 Jul 2019 20:17

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