Coletor Solar Fresnel: Identificação de um modelo de parâmetros distribuídos

Abstract

This article identifies the parameters of the dynamic model of the Fresnel solar collector installed at the Escuela Técnica Superior de Ingenieros (ETSI), in Seville, Spain. The parameters identified are: the average thermal efficiency, the specific mass, the average heat capacity of the working fluid, the coefficients of thermal losses to the environment, the coefficient of heat exchange between the metallic tube and the working fluid. The model is integrated in time with integration steps of ∆t = 5s, and in space with discretizations of ∆x = 1m. The identification algorithm performs an optimization seeking to minimize the normalized squared error between the model prediction and measurements of the solar collector outlet temperature. The purpose of the identifier is to be able to update parameters throughout the life of the plant for control and optimization of operation, start-up and shutdown. The partial results show that the model obtained satisfactorily follows the collector outlet temperature measured data with a coefficient of determination R2 = 0.995 and mean square error of RMSE = 2.93◦C, considering 207605 steps of integration. The following works must validate the model comparing new measured data not correlated with the identification.