2018
DOI: 10.1115/1.4038706
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Characterization and Corrections for Clamp-On Fluid Temperature Measurements in Turbulent Flows

Abstract: 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 … Show more

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Cited by 6 publications
(10 citation statements)
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“…Closed thermowells, therefore, protect the sensing element in such aggressive environments. The sensor location can influence the measurement error significantly higher than the error tolerance given by the instrument's manufacturer [5,7]. Besides the permanently installed temperature sensors, clamp-on sensors are often used for temporally limited, special measurement events such as the recalibration of existing sensors, performance and acceptance testing or troubleshooting during operation [7].…”
Section: Temperature Sensorsmentioning
confidence: 99%
See 1 more Smart Citation
“…Closed thermowells, therefore, protect the sensing element in such aggressive environments. The sensor location can influence the measurement error significantly higher than the error tolerance given by the instrument's manufacturer [5,7]. Besides the permanently installed temperature sensors, clamp-on sensors are often used for temporally limited, special measurement events such as the recalibration of existing sensors, performance and acceptance testing or troubleshooting during operation [7].…”
Section: Temperature Sensorsmentioning
confidence: 99%
“…To determine the HTF temperature, a correction function has to be applied. In the case of Nouri et al [7], a polynomial correction function from experimental data with typical solar field parameters was carried out. In addition, a correction via dimensional analysis for more general applications was performed.…”
Section: Temperature Sensorsmentioning
confidence: 99%
“…The situation is axisymmetric at this stage, and the thermal behavior of the setup in a steady state can be described by a linear chain of thermal resistances (see e. g. [5,8] for previous work on this approach). Details of our specific formulation and use of the model are given in Section 3.1.…”
Section: Two-step Measurement Approachmentioning
confidence: 99%
“…Through dimensional analysis, a considerable number of parameters are organized to give an estimate that demonstrates a range of process conditions where a surface measurement is adequate. Nouri et al [8] propose an elaborated shielded cable sensor setup for achieving reliable accuracy indicating clearly that the performance of the sensors can be improved with careful design.…”
Section: Introduction -The Relevance Of Non-invasive Temperature Measmentioning
confidence: 99%
“…These additional data provide flow and temperature measurements within the test loops with a high temporal resolution. For this purpose the loops were equipped with a FLEXIM FLUXUS ADM 6725 clamp on ultrasonic flow meters with wave injectors for high temperature applications at the loop center (cross over piping) and a clamp-on temperature measuring system based on PT100s at the loop inlet and outlet (Nouri et al 2018a). The validation was conducted over distinct cases including normal operations with predominantly clear conditions, start-up situations in clear mornings and conditions with strong transients due to cloud passages.…”
Section: Overview Of Virtual Solar Fieldmentioning
confidence: 99%