Electronics thermal management
This lesson introduces electronics thermal management in space systems, focusing on heat dissipation mechanisms, cooling techniques, and thermal modeling of printed circuit boards (PCBs) and electronic components.
This lesson may include hands-on exercises. Review the Discussion section for background information or click the button to proceed to the practical section.
Discussion
Electronics thermal management is critical in space systems due to increasing component density, higher power dissipation, and strict reliability requirements. Temperature variations directly affect electronic performance, material properties, and long-term durability, making accurate thermal modeling essential.
Electronic components dissipate heat through conduction, convection, and radiation, with the dominant mechanism depending on the application and operating environment. Temperature increases can alter electrical parameters and induce thermal stresses caused by material expansion and contraction, which may impact circuit operation and structural integrity.
Cooling strategies vary based on system size and environment. Small systems often rely on heat sinks and heat pipes, while aerospace applications may use surface treatments and forced convection. Larger systems, such as communication shelters, typically incorporate active cooling solutions including fans.
Simcenter 3D Space Systems Thermal provides dedicated tools for modeling PCBs using the PCB Stack physical property. PCB stacks allow efficient representation of complex, anisotropic in-plane and through-thickness thermal behavior by defining PCB layers and vias without requiring full 3D solid meshes. PCB layers define orthotropic conductivity, while PCB vias model thermal coupling between layers.
Thermal dissipation of electronic components is modeled using the PCB Component simulation object, which defines component thermal behavior, radiative properties, and heat dissipation. Components are thermally connected to the PCB through mounting regions, and different compact thermal models are available to represent varying levels of fidelity. These include dissipation-only models, one-resistor, two-resistor, and underfill-based models, enabling accurate representation of component-to-board heat transfer.
Hands-on material
To gain experience with the topics discussed here, complete the following:
