Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
SOLAR RAY-TRACING SIMULATION AND THERMAL ANALYSIS OF A DISH STIRLING RECEIVER
Submission Author:
André Leandro de Souza , MG
Co-Authors:
André Leandro de Souza, Gaylord Carrillo, Osvaldo Jose Venturini, vladimir cobas, Electo Eduardo Lora
Presenter: Gaylord Carrillo
doi://10.26678/ABCM.ENCIT2018.CIT18-0199
Abstract
This work presents a computational simulation of the sun's rays to develop an optical analysis and a thermal analysis by mathematical modeling of a Dish Stirling receiver, with the purpose to evaluate the overall system performance for weather conditions of Itajubá City-MG, Brazil. Opto-geometric characteristic of the dish-Stirling’s concentrator and receiver are considered. In this work, the configuration of the Dish Stirling system installed at NEST/UNIFEI Heliothermic Energy Laboratory, in Itajubá, is considered as a reference to define the parameters used in the simulations and analysis of the system operation, as such as receiver temperature, ambient temperature, wind speed, elevation angle, focal length, and geometric parameters. Weather information was also taken from the city of Itajubá. This system has a collector with a diameter of 3.75 m, the focal length of 2.3 m, receiver diameter 0.30 m and absorber diameter 0.10 m. In the thermal analysis, the highest thermal losses identified were the losses by radiation, which exceed the losses by natural and forced convection in 83% and 61% respectively. The optical-ray simulation identified the existence of spillage losses, which can be corrected by repositioning the receiver in its holder a few centimeters to the back side.
Keywords
Computational simulation, dish stirling receiver, spillage losses, Heat losses, Ray-tracing
