Abstract

Refrigeration machines play a crucial role in various sectors by generating artificial cold for numerous applications, from food preservation to industrial processes. Among the available thermodynamic cycles, Vuilleumier refrigerators are particularly effective for low-temperature cooling, employing a unique mechanism involving two displacers connected by a mechanical linkage. These devices transfer thermal energy consuming work internally, functioning as efficient heat pumps and cryocoolers. This study addresses the challenge of improving the efficiency of Vuilleumier refrigerators when powered by concentrated solar energy. Here, we present an endoreversible thermodynamic analysis that reveals the optimal integration of solar concentrators with Vuilleumier refrigeration systems, highlighting their potential for enhanced performance. Our findings indicate that the system's Coefficient of Performance (COP) significantly increases with higher input temperatures, thereby improving cold production. This research contributes to the existing body of knowledge by providing generalized expressions that facilitate the design and optimization of solar-powered Vuilleumier machines. Ultimately, our results underscore the potential of harnessing solar energy in advancing sustainable refrigeration technologies, paving the way for environmentally friendly solutions to meet increasing cooling demands.