The paper describes development, fabrication and test of a high performance heat pipe radiator to cool high dissipating repeater units for future communications satellites. According to design guidelines established during a general radiator study a configuration with 11 parallel and two crosswise heat pipes, bonded between face sheets of a honeycomb sandwich, has been selected. The heat pipe is an axially grooved aluminium profile with ammonia as working fluid. The cross section of the pipe is rectangular to fit the 30 mm sandwich height which was required for structural reasons. Before building the radiator a special test program was performed to investigate the one-sided heat input into the heat pipe for this type of radiator interface. Results show that the radiator efficiency may be substantially improvedby the use of saddle blocks bonded to the heat pipe, which actually represents a three-sided heat input. The completed radiator was thermally tested in a liquid nitrogen shrouded vacuum chamber to simulate deep space environment. Test results correlate very good with calculated temperatures. (Wassmann)
A prototpye heat pipe radiator for the german direct broadcasting TV-satellite
Ein Prototyp-Waermeleitrohrradiator fuer den deutschen direkt sendenden Fernsehsatelliten
AIAA-Papers ; 1-9
1980
9 Seiten, 15 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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