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Energies 2015, 8(2), 1042-1057; doi:10.3390/en8021042

Thermal Model of a Dish Stirling Cavity-Receiver

Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza, Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain
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Academic Editor: Enrico Sciubba
Received: 8 September 2014 / Revised: 4 January 2015 / Accepted: 26 January 2015 / Published: 30 January 2015
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Abstract

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. View Full-Text
Keywords: dish Stirling system; solar cavity-receiver; thermal model; finite difference method; radiosity method; view factors dish Stirling system; solar cavity-receiver; thermal model; finite difference method; radiosity method; view factors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gil, R.; Monné, C.; Bernal, N.; Muñoz, M.; Moreno, F. Thermal Model of a Dish Stirling Cavity-Receiver. Energies 2015, 8, 1042-1057.

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