Inverse heat problem of determining unknown surface heat flux in a molten salt loop
| Autor: | José Antonio Almendros-Ibáñez, C. Sobrino, M. Fernández-Torrijos, Domingo Santana, C. Marugán-Cruz |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España) |
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Power station Mechanical Engineering Induction heater Inverse Tube bending 02 engineering and technology Mechanics Inverse problem 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Temperature measurement 010305 fluids & plasmas Heat flux Deflection (engineering) Energías Renovables 0103 physical sciences Molten salt Central receiver 0210 nano-technology Inverse heat conduction problem Inductor coil |
| Zdroj: | e-Archivo: Repositorio Institucional de la Universidad Carlos III de Madrid Universidad Carlos III de Madrid (UC3M) e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid instname |
| DOI: | 10.1016/j.ijheatmasstransfer.2019.05.002 |
| Popis: | Inverse heat transfer problems typically rely on temperature measurements for estimating unknown boundary heat flux, such as that in the water tubes of steam boilers or central receivers in solar tower power plants. In this work, an experimental facility consisting of a molten salt loop that simulates a tube of a solar tower receiver is presented to obtain the outer tube surface temperatures under solar tower power plant operating conditions. The external surface f the pipe in the test section is heated in a controlled manner with an induction heater, which provides a very high nonuniform heat flux. An inverse thermal method has been applied to obtain the incident heat flux onto the receiver tube from the outer surface temperature measurements. To solve the inverse problem, a transient two-dimensional numerical model of a circular pipe flowing molten nitrate salt and subjected to a nonhomogeneous circumferential heat flux has been developed. The heat flux calculation with the inverse method is in accordance with the heat flux estimation based on the calibration of the induction heater. A good agreement between the experimental and calculated temperatures is observed. Furthermore, the deflection of the tube caused by the nonhomogeneous heat flux is measured and is compared to the deflection calculated from the radial temperature profile from the inverse problem solution, and a good agreement between both results is observed. This work was partially funded by the Ministerio de Eduación, Cultura y Deporte para la Formación de Profesorado Universitario (FPU-04941), the Ministerio de Ciencia, Innovacion y Universidades (Project RTI2018-096664-B-C21 (MICINN/FEDER, UE)) of the Spanish Government and the Project SBPLY/17/180501/000412 of the Regional Government of Castilla-La Mancha. |
| Databáze: | OpenAIRE |
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