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Long Duration Exposure Facility (LDEF) low-temperature Heat Pipe Experiment Package (HEPP)The flight test results are discussed obtained with the Heat Pipe Experiment Package (HEPP). The HEPP was designed to demonstrate the performance of an ethane constant conductance heat pipe (CCHP) and an ethane heat pipe diode in microgravity. These heat pipes have a nominal operating temperature range of 140 to 250 K. Also, included in the HEPP is a Phase Change Material (PCM) canister which provides temperature stability through melting and freezing of the n-heptane PCM. A comparison of pre-flight, flight, and post-flight thermal performance is also presented.
Document ID
Document Type
Conference Paper
Mcintosh, Roy
(NASA Goddard Space Flight Center Greenbelt, MD., United States)
Brennan, Patrick J.
(OAO Corp. Greenbelt, MD., United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Publication Information
Publication: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts
Subject Category
Fluid Mechanics And Heat Transfer
Distribution Limits
Work of the US Gov. Public Use Permitted.

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