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Evaluation of a Phase Changing Passive Cooling System
Keywords: system level thermal management, loop heat pipe, avionics
This paper describes a feasibility assessment study on the use of a phase change passive cooling device to augment box level cooling of an avionics system. The cooling system, which was developed by Alam Thermal Solutions, relies on a method that automatically creates a cyclic flow of liquid and vapor between the evaporator and the condenser. The goal of this project is to determine if this type of cooling system could be used to absorb a significant portion of the heat dissipated from an avionics system and move it to a nearby location on the platform where the heat could be rejected more efficiently. Testing with an initial prototype showed that with heat inputs of 100W, the evaporator temperature was maintained in the range of 110-120C at multiple orientations of the cooling loop, with water as the working fluid. The results of continuing work using a second generation device will also be reported in the paper. This research will investigate the effects of alternate working fluids, device orientation, atmospheric pressure and the ability to operate with and without fans.
Matthew Yao, Principal Mechanical Engineer
Rockwell Collins
Cedar Rapids, IA

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