Geometric Optimization of an External Enclosure to Enhance Receiver Thermal Performance in Concentrated Solar Power Systems

Abstract Concentrated Solar Power (CSP) holds promise as a method of effectively harnessing solar energy. Light-Trapping Planar Cavity Receivers (LTPCRs) are a promising next-generation receiver configuration capable of achieving high efficiencies. Accurate prediction of thermal performance and subsequent improvement strategies are crucial to mitigate risks and optimize performance of LTPCRs. Enclosing the receiver with passive refractory surfaces can significantly reduce temperature differentials between the receiver and the ambient environment, thereby enhancing receiver efficiency. However, the optimal enclosure geometry is complex and influenced by numerous geometric parameters. This study employs computational fluid dynamics (CFD) simulations in Ansys Fluent to investigate the impact of enclosure geometry features on key thermal performance indicators. The Surface-to-Surface (S2S) method is utilized to model radiation exchange between surfaces. Through sensitivity analysis and a detailed discussion of trends, valuable insights are gained. Finally, recommendations are provided to further improve receiver performance and determine precise enclosure geometry parameters.