Advances in satellite thermal management systems: Challenges, innovations, and future directions

Effective thermal management is a cornerstone of satellite functionality, ensuring reliability and operational success in extreme space environments. This study comprehensively reviews the state-of-the-art in satellite thermal management systems, encompassing both passive and active techniques. Passive systems, including multilayer insulation (MLI), thermal coatings, and phase-change materials (PCMs), offer energy efficiency and reliability for baseline thermal regulation. Conversely, active systems, such as heat pipes, loop heat pipes (LHPs), and mechanically pumped fluid loops (MPFLs), provide dynamic adaptability to manage high-power loads and fluctuating environmental conditions. The paper also explores recent advancements in thermal management, such as smart materials, variable-emittance coatings, and hybrid systems that combine the benefits of both passive and active approaches. Furthermore, the integration of computational techniques, such as the finite element method (FEM) and computational fluid dynamics (CFD), has significantly enhanced the prediction of thermal performance. Experimental validation through thermal-vacuum testing is also discussed as a critical step in refining and ensuring the accuracy of these systems. By integrating advances in materials, technologies, and modeling methods, this review highlights emerging trends and challenges in satellite thermal management. The findings underline the importance of hybrid systems, material innovations, and computational modeling in addressing the evolving demands of next-generation satellite missions. Future directions are proposed to guide continued research and development in this vital area of aerospace engineering.