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Experiment: S1001

Experiment Title: Low-Temperature Heat Pipe Experiment Package (HEPP) for LDEF

Original Principal Investigator(s): McIntosh, Mr. Roy - Invest. Role: Original, McIntosh, Mr. Roy - Invest. Role: Present, Tiller, S. - Invest. Role: Present, Tiller, S. - Invest. Role: Original,

Experiment Description:

Experience gained in the development of heat pipes has demonstrated the necessity of obtaining performance data in the space environment. This was due to the fact that the pumping in a heat pipe was derived from relatively weak capillary forces. As a result, particularly in the case of the axially grooved geometry, reliable 1-g performance measurements were often very difficult to obtain. Also, many of the candidate low-temperature and cryogenic fluids have relatively low surface tensions and wicking heights, which compound the problem of 1-g tests.

The Low Temperature Heat Pipe Flight Experiment (HEPP) was a detailed thermal control experiment designed to evaluate the performance of two different low temperature ethane heat pipes and a low-temperature (182 K) phase change material. The LDEF and its extended mission provided a unique opportunity for the long term evaluation not only of the ethane use in heat pipes but also the various space flight subsystems that are needed to support the HEPP.

Associated Tray(s) Tray Location: H01 - Orientation: Space-facing end, Tray Location: F12 - Orientation: 81.9 degrees off ram incidence angle

Photograph Classification: Postflight

Associated Photograph(s):
LaRC - L90-13488
KSC - KSC-390C-1069.08
JSC - None
LaRC - L84-07339
KSC - KSC-383C-4425.08
JSC - None
LaRC - L90-10432
KSC - None
JSC - S32-78-036
LaRC - L91-11748
KSC - KSC-390C-2367.04
JSC - None
LaRC - L84-07331
KSC - KSC-383C-4419.12
JSC - None
LaRC - L90-10335
KSC - None
JSC - S32-75-036
LaRC - L92-21189
KSC - None
JSC - S32-S-282


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