Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
HEAT TRANSFER STUDY IN A VOLUMETRIC RECEIVER USED IN CONCENTRATING SOLAR POWER PLANTS
Submission Author:
Taísa Santos Da Silva , SP
Co-Authors:
Paulo Mohallem Guimarães, Fábio Santos Nascimento, Genésio Menon, Gabriel Araujo
Presenter: Taísa Santos Da Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0109
Abstract
This is a numerical study on heat transfer in a volumetric receiver applied in solar plants based on concentrating solar radiation. The heliostat field concentrates solar radiation in the receiver at the top of a tower. The receiver consists of some parts named secondary concentrator, a window glass, an absorber media and an external pressurized vessel. The secondary concentrator focuses solar radiation into the glass window. The radiation goes through the window to the absorber porous media located inside the pressurized vessel. Absorber conducts heat to a heat transfer working fluid. In this work, this heat transfer agent is the air. Colder pressurized air enters the volumetric receiver inlet and exits through an outlet at higher temperatures. Then the hot air is used in some thermodynamic cycles to produce electricity. A simulation package is used to approximate solutions in order to improve thermal efficiency of the receiver considering a mixed convection heat transfer in a transient regime. The mathematical model and the numerical techniques, which are used in this package, are validated with some benchmark problems found in literature. Then, an independency mesh study is performed. This is a dimensionless study in which some dimensionless, physical, and geometrical parameters are ranged as follows: i) the Reynolds number, ii) the Grashof number, and iii) the heat flux as to simulate direct normal irradiation (DNI) in annual average basis. Thermal efficiencies are found to range from 50 to 80%.
Keywords
Concentrating Solar Plant, Volumetric Receiver, Heat transfer, Solar Power Tower, Concentrating Solar Plant, Volumetric Receiver, Heat transfer, Solar Power Tower, Concentrating Solar Plant, Volumetric Receiver, Heat transfer, Solar Power Tower
