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Thermal Interface Evaluation of Heat Transfer from a Pumped Loop to Titanium-Water ThermosyphonsTitanium-water thermosyphons are being considered for use in the heat rejection system for lunar outpost fission surface power. Key to their use is heat transfer between a closed loop heat source and the heat pipe evaporators. This work describes laboratory testing of several interfaces that were evaluated for their thermal performance characteristics, in the temperature range of 350 to 400 K, utilizing a water closed loop heat source and multiple thermosyphon evaporator geometries. A gas gap calorimeter was used to measure heat flow at steady state. Thermocouples in the closed loop heat source and on the evaporator were used to measure thermal conductance. The interfaces were in two generic categories, those immersed in the water closed loop heat source and those clamped to the water closed loop heat source with differing thermal conductive agents. In general, immersed evaporators showed better overall performance than their clamped counterparts. Selected clamped evaporator geometries offered promise.
Document ID
Document Type
Conference Paper
Jaworske, Donald A.
(NASA Glenn Research Center Cleveland, OH, United States)
Sanzi, James L.
(Sest, Inc. Cleveland, OH, United States)
Gibson, Marc A.
(Sierra Lobo, Inc. Cleveland, OH, United States)
Sechkar, Edward A.
(ASRC Aerospace Corp. Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
August 2, 2009
Subject Category
Mechanical Engineering
Report/Patent Number
Meeting Information
7th International Energy Conversion Engineering Conference(Denver, CO)
Funding Number(s)
WBS: WBS 463169.
Distribution Limits
Public Use Permitted.

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NameType 20090042364.pdf STI