Water Phase Change Heat Exchanger System Level Analysis for Low Lunar Orbit

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dc.creatorUngar, Eugene
dc.creatorNavarro, Moses
dc.creatorHansen, Scott
dc.creatorSheth, Rubik
dc.date.accessioned2016-07-28T19:33:09Z
dc.date.available2016-07-28T19:33:09Z
dc.date.issued2016-07-10
dc.descriptionUnited States
dc.descriptionNASA JSC
dc.descriptionNASA
dc.descriptionNASA - Johnson Space Center
dc.description104
dc.descriptionICES104: Advances in Thermal Control Technology
dc.descriptionVienna, Austria
dc.descriptionEugene Ungar, NASA, Johnson Space Center, USA
dc.descriptionMoses Navarro, NASA, Johnson Space Center, USA
dc.descriptionScott Hansen, NASA, Johnson Space Center, USA
dc.descriptionRubik Sheth, NASA, Johnson Space Center, USA
dc.descriptionThe 46th International Conference on Environmental Systems was held in Vienna, Austria, USA on 10 July 2016 through 14 July 2016.
dc.description.abstractIn low Lunar orbit (LLO) the thermal environment is cyclic – extremely cold in the eclipse and warmer than room temperature near the subsolar point. Phase change material heat exchangers (PCM HXs) are the best option for long term missions in these environments. The Orion spacecraft will use n pentadecane wax PCM HX for its envisioned mission to low Lunar orbit. Using water as a phase change material is attractive because its higher heat of fusion and greater density result in a lighter, more compact PCM HX. To assess the use of a water PCM HX for a human spacecraft in a circular LLO, a system level analysis was performed for the Orion spacecraft. Three cases were evaluated: a) A direct replacement of the wax PCM HX on the internal thermal control loop with a water PCM HX (including control modifications), b) a water PCM HX on the internal thermal control loop with a reduced radiator return setpoint temperature, c) locating the water PCM HX on the external loop with a controlled bypass. The model showed that the water PCM HX could not be used as a drop-in replacement for the wax PCM HX. It did not freeze fully during the eclipse owing to its lower freezing point. Even in the most advantageous location – on the external loop - at least 15% more radiator area than the Orion baseline was required to obtain equivalent performance. The study shows that, although water PCM HXs are attractive at a component level, system level effects mean that they are not a good choice for LLO.
dc.format.mimetypeapplication/pdf
dc.identifier.otherICES_2016_359
dc.identifier.urihttp://hdl.handle.net/2346/67686
dc.language.isoeng
dc.publisher46th International Conference on Environmental Systems
dc.subjectWater Phase Change
dc.subjectPhase Change Material
dc.subjectPCM
dc.subjectSHReD
dc.subjectSupplemental Heat Rejection
dc.subjectHeat Exchanger
dc.subjectFreezing
dc.subjectFrozen
dc.subjectFrozen Water
dc.subjectFreezing Water
dc.subjectOrion
dc.subjectThermal Control System
dc.subjectPhase Change Material Heat Exchanger
dc.subjectSystem Level Analysis
dc.titleWater Phase Change Heat Exchanger System Level Analysis for Low Lunar Orbit
dc.typePresentation

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