Thermal model of a dish/Stirling systems |
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Authors: | François Nepveu Alain Ferriere Françoise Bataille |
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Affiliation: | CNRS-PROMES Laboratory, 7 rue du four solaire, 66120 Font-Romeu, France |
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Abstract: | This paper presents a global thermal model of the energy conversion of the 10 kWel Eurodish dish/Stirling unit erected at the CNRS-PROMES laboratory in Odeillo. Using optical measurements made by DLR, the losses by parabola reflectivity and spillage are calculated. A nodal method is used to calculate the heat losses in the cavity by conduction, convection, reflection and thermal radiation. A thermodynamic analysis of a SOLO Stirling 161 engine is made. The Stirling engine is divided in 32 control-volumes and equations of ideal gas, mass and energy conservation are written for each control-volume. The differential equation system is resolved by an iterative method developed using Matlab™ programming environment. Temperature, mass, density of working gas, heat transfers and the mechanical power are calculated for one Stirling engine cycle of 40 ms and for a constant direct normal irradiation (DNI). The model gives consistent results correctly fitting with experimental measurements. |
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Keywords: | Eurodish Dish/Stirling system Thermal model Heat losses Energy balance Stirling engine |
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