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.
Highlights
The purpose of a dish Stirling cavity to absorb thermal energy from the concentrator and transfer it to the working fluid in the Stirling engine
Cavity dimensions can be modified because of the dynamic mathematical statement proposed for numerical resolution of the model
This model has been used to create a design tool to find the patterns of the influence of dimensions and material properties on the cavity heat losses
Summary
The purpose of a dish Stirling cavity to absorb thermal energy from the concentrator and transfer it to the working fluid in the Stirling engine. [2] demonstrated that hybridization showed a clear benefit depending on the fuel used, and Bravo et al [3] studied the environmental impact factor on the receiver depending on the fuel used. In this context, it is necessary to develop a tool to study the cavity performance as a function of its geometry. It is necessary to develop a tool to study the cavity performance as a function of its geometry
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