Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Influence of geometric parameters in thermal behavior of the receiver of a Linear Fresnel Reflector system
Submission Author:
Patricia Scalco , RS
Co-Authors:
Patricia Scalco, Jacqueline Copetti, Mario Henrique Macagnan
Presenter: Patricia Scalco
doi://10.26678/ABCM.COBEM2017.COB17-0958
Abstract
Abstract: The use of Linear Fresnel Reflectors (LFR) appears as a very prospective alternative in the application of Concentrated Solar Power (CSP) for systems that need working temperatures above 150 ° C. Thus, the study of the receptor becomes extremely important, since it is in it that the conversion of Direct Normal Irradiation (DNI) occurs. The receiver is composed of one or more absorptive tube(s), by a glass involute, which serves to reduce thermal losses, and by a secondary concentrator. The secondary concentrator consists of a reflective surface that has the function of maximizing the amount of rays that are absorbed by the receiver. The format of the secondary concentrator varies and depends on the demands of the studied system. For this work, a CPC (Compound Parabolic Collector) secondary concentrator type and an absorber tube configuration were used. The purpose of this study was to analyses the influence of the geometric parameters on the thermal performance of the receiver of an LFR arrangement. For this, a thermal balance was made considering the radiative effects of the three surfaces involved in this process (absorber tube, secondary concentrator and glass involute). For this procedure, the EES (Engineering Equation Solver) software was used as computational tool. Thus, it was possible to establish a relationship between the length of the absorber tube and the thermal losses of the system, since the more extensor the absorber tube, the greater the dispersed heat rate for the environment.
Keywords
linear fresnel reflector, concentrated solar power, secondary concentrator, thermal balance, geometric parameters
