Thermal Model of a Dish Stirling Cavity-Receiver

Rubén Gil, Carlos Monné, Nuria Bernal, Mariano Muñoz and Francisco Moreno
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Rubén Gil: Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza, Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain
Carlos Monné: Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza, Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain
Nuria Bernal: Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza, Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain
Mariano Muñoz: Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza, Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain
Francisco Moreno: Mechanical Engineering Department, Engineering and Architecture School, University of Zaragoza, Maria de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain

Energies, 2015, vol. 8, issue 2, 1-16

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.

Keywords: dish Stirling system; solar cavity-receiver; thermal model; finite difference method; radiosity method; view factors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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