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Development, Testing, and Failure Mechanisms of a Replicative Ice Phase Change Material Heat ExchangerPhase change materials (PCM) may be useful for thermal control systems that involve cyclical heat loads or cyclical thermal environments such as Low Earth Orbit (LEO) and Low Lunar Orbit (LLO). Thermal energy can be stored in the PCM during peak heat loads or in adverse thermal environments. The stored thermal energy can then be released later during minimum heat loads or in more favorable thermal environments. One advantage that PCM s have over evaporators in this scenario is that they do not use a consumable. Wax PCM units have been baselined for the Orion thermal control system and also provide risk mitigation for the Altair Lander. However, the use of water as a PCM has the potential for significant mass reduction since the latent heat of formation of water is approximately 70% greater than that of wax. One of the potential drawbacks of using ice as a PCM is its potential to rupture its container as water expands upon freezing. In order to develop a space qualified ice PCM heat exchanger, failure mechanisms must first be understood. Therefore, a methodical experimental investigation has been undertaken to demonstrate and document specific failure mechanisms due to ice expansion in the PCM. An ice PCM heat exchanger that replicates the thermal energy storage capacity of an existing wax PCM unit was fabricated and tested. Additionally, methods for controlling void location in order to reduce the risk of damage due to ice expansion are investigated. This paper presents the results to date of this investigation.
Document ID
20090038754
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Leimkuehler, Thomas O.
(Paragon Space Development Corp. AZ, United States)
Hansen, Scott
(Texas A&M Univ. TX, United States)
Stephan, Ryan A.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
JSC-CN-19198
Meeting Information
Meeting: 40th International Conference on Environmental Systems
Location: Barcelona
Country: Spain
Start Date: July 11, 2010
End Date: July 15, 2010
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Other

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