Colloquium announcement

Faculty of Engineering Technology

Department Production Technology
Master programme Industrial Design Engineering

As part of his / her masterassignment

Jeroen Terpstra

will hold a speech entitled:


RoomNH 124


Next generation radar systems use high power transmitters. These transmitters often have a low efficiency in converting electrical energy into microwave energy resulting in high amounts of generated heat that should be dissipated. Currently, cooling capability is the limiting factor in radar design. Implementing new technologies in radar cooling systems is therefore a necessity to boost radar cooling performance and by this clearing the path for higher RF power outputs.


The goal of this master thesis is to improve radar cooling by investigating and evaluating novel cooling technologies and manufacturing processes for implementation in a radar system. Analyzing the heat flow path of an actual radar system revealed bottlenecks responsible for critical temperature levels of radar components endangering the system reliability. These bottlenecks can be reduced by optimizing the existing heat flow path or can be avoided by exploring alternative heat flow paths. The focus of this assignment lays on revealing the limitations of the existing heat flow path since the latter requires a more difficult to implement redesign of the radar system. Optimizing the existing heat flow path consisted of two cases: improving the thermal contact conductance of an interface and enhancing the thermal conductivity of a thin metal plate. For the first case, a Design of Experiments was conducted which revealed the influence of various parameters on the thermal performance of an interface. For the second case, multiple two-phase cooling technologies were evaluated for their feasibility regarding implementation and for their thermal conductivity enhancing capabilities. Of these technologies, two were selected and further elaborated into practical concepts. The feasibility of the most innovative concept was tested in a Proof of Principle including a prototype. Results of the cases served as input for a thermal simulation of the total system. This simulation shows the actual temperature levels of radar components and proves that the requirements regarding system reliability can be met by optimizing the existing heat flow path. However, ideas for alternative heat flow paths are proposed which could further extend the cooling capacity in case requirements were not met or for future applications.