Thermal Model of a Dish Stirling Cavity-Receiver

Energies

Rubén Gil¹  Carlos Monné²  Nuria Bernal²  Mariano Muñoz²  Francisco Moreno² 

[1] Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza; Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain;

关键词: dish Stirling system;    solar cavity-receiver;    thermal model;    finite difference method;    radiosity method;    view factors;   

DOI  :  10.3390/en8021042

来源: mdpi

【 摘 要 】

This paper presents a thermal model for a dish Stirling cavity based on the finite differences method. This model is a theoretical tool to optimize the cavity in terms of thermal efficiency. One of the main outcomes of this work is the evaluation of radiative exchange using the radiosity method; for that purpose, the view factors of all surfaces involved have been accurately calculated. Moreover, this model enables the variation of the cavity and receiver dimensions and the materials to determine the optimal cavity design. The tool has been used to study the cavity optimization regarding geometry parameters and material properties. Receiver absorptivity has been identified as the most influential property of the materials. The optimal aperture height depends on the minimum focal space.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.