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research-article

Characterization and corrections for clamp-on fluid temperature measurements in turbulent flows

[+] Author and Article Information
Bijan Nouri

German Aerospace Center (DLR), Institute of Solar Research, Plataforma Solar de Almería (PSA), 04200 Tabernas, Spain
bijan.nouri@dlr.de

Marc Röger

German Aerospace Center (DLR), Institute of Solar Research, Plataforma Solar de Almería (PSA), 04200 Tabernas, Spain
Marc.Roeger@dlr.de

Nicole Janotte

German Aerospace Center (DLR), Institute of Solar Research, Linder Höhe, 51147 Köln, Germany
Nicole.Janotte@dlr.de

Christoph Hilgert

German Aerospace Center (DLR), Institute of Solar Research, Plataforma Solar de Almería (PSA), 04200 Tabernas, Spain
Christoph.Hilgert@dlr.de

1Corresponding author.

ASME doi:10.1115/1.4038706 History: Received May 08, 2017; Revised October 11, 2017

Abstract

A clamp-on measurement system for flexible and accurate fluid temperature measurements for turbulent flows with Re numbers higher than 30,000 is presented in this paper. This non invasive 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 ±0.7 K (2s) 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 non-invasive 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 (2s).

Copyright (c) 2017 by ASME
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