Development of a Passive Cooling Solution for next-generation aircraft

Thermal management and reliability of electrical systems in harsh environments are critical for propelling growth of the MEA market. More efficient ways of cooling electronic devices using a technique called heat spreader are becoming a bigger piece of heat transfer solutions. However, these systems have not been hitherto demonstrated in avionics applications. Modelling and experimental tests are required before being integrated in aircraft.

The EU-funded project 'Passive cooling solution validation for aircraft application' (HTCS) is developing a two-phase heat transfer system that handles increased thermal dissipation and is passive. The work will result in a technology-readiness level six of a two-phase passive cooling system with a high heat exchange coefficient. The system's maximum temperature is expected to not exceed 200 degrees Celsius.

Scientists have already established the cooling system specifications. A trade-off and risk analysis led to selection of a heat spreader with a body made of nickel, a nickel wick and water as working fluid. Work is ongoing regarding the establishment of the interface control drawing, the cooling system design description and justification, and the breadboarding activities.

Project developments should enable aeronautical actors to completely switch to a full electrical system with the required reliability even in extremely constrained environments. The proposed HTCS system will surpass other cooling technologies in terms of heat management, size and power density. Furthermore, it will ensure an extended lifetime of the equipment allowing to reduce maintenability constraints.