The use of thermosyphons is becoming widespread due to their passive nature and their ability to provide effective heat transfer with minimal losses. The research on thermosyphon design and its performance is still being conducted both at academic and industrial levels. Different types of thermosyphons have been developed to address thermal management problems in various parts of industry including Satellite industry where panels are successfully being cooled using this technology. In this work, we are using such a thermosyphon that is axially grooved and is being investigated for startup power requirements at various inclinations.
It is important to note that Boiling and condensing of internal working fluids are essential heat transfer concepts which thermosyphon technology relies on for transporting large amount of heat between two distanced points effectively. Tilt angle and working fluid saturation temperature has a direct impact on how well the evaporator is flooded. This paper will focus on how the tilt angle and working fluid saturation temperature affects the start-up heat input requirements for an “S shaped” axial grooved ammonia thermosyphon.
Heat is applied at the evaporator of the thermosyphon with resistance heaters. The condenser is liquid cooled with a cold plate and a chilled water recirculator. A heater assembly consists of a copper plate, a G10/FR-4 plate, thermal interface material, and ceramic resistance heaters were designed and manufactured to evenly heat the overall length of the evaporator. Further results that are currently being collected will be analyzed in near future and will be presented in the conference.