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Highly Concentrated Solar Radiation Measurement by Means of an Inverse Method

L. Mongibello1 N. Bianco2 R. Fucci1 F. Moscariello2
1ENEA - Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Portici, Italy
2DETEC - Università degli Studi di Napoli Federico II, Napoli, Italy

Prototype sensor picture and temperature map inside the prototype sensor.

This work focuses on the numerical analysis conducted on the prototype sensor for the measurement of highly concentrated radiative heat fluxes, based on an inverse heat transfer method, realized at the ENEA Portici Research Center in collaboration with the DETEC department of the University of Naples Federico II. The estimates of highly concentrated radiative heat fluxes on the target surface of the sensor are obtained by implementing the inverse heat transfer method based on the Levenberg-Marquardt algorithm. Simulations have been carried out in order to evaluate the incidence of some characteristics such as the emissivity of the target surface of the sensor, the synchronization error in the temperature measurements, and the measurement error of the thermocouples. The unsteady temperatures field inside the prototype has been simulated using the COMSOL 2D axisymmetric solver, while the implementation of the inverse method algorithm has been performed using a home code written in MATLAB(R).

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