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Microencapsulated PCM slurries for heat transfer and energy storage in spacecraft systemsThe technical feasibility for providing significantly enhanced heat transport and storage as well as improved thermal control has been investigated during several Small Business Innovative Research (SBIR) programs for NASA, the United States Air Force (USAF), and the Strategic Defense Initiative Organization (SDIO) using microencapsulated phase change materials (PCMs) in both aqueous and nonaqueous two-component slurries. In the program for SDIO, novel two-component coolant fluids were prepared and successfully tested at both low (300 K) and intermediate temperatures (460 to 700 K). The two-component fluid slurries of microencapsulated PCMs included organic particles in aqueous and nonaqueous liquids, as well as microencapsulated metals that potentially could be carried by liquid metals or used as powdered heat sinks. Simulation and experimental studies showed that such active cooling systems could be designed and operated with enhancements of heat capacity that exceeded 10 times or 1000 percent that for the base fluid along with significant enhancement in the fluid's heat capacity. Furthermore, this enhancement provided essentially isothermal conditions throughout the pumped primary coolant fluid loop. The results suggest that together with much higher fluid thermal capacity, greater uniformity of temperature is achievable with such fluids, and that significant reductions in pumping power, system size, and system mass are also possible.
Document ID
19930036784
Document Type
Conference Paper
Authors
Colvin, David P. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Mulligan, James C. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Bryant, Yvonne G. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Duncan, John L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Gravely, Benjamin T. (Triangle Research and Development Corp. Research Triangle Park, NC, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Space nuclear power systems 1989; Proceedings of the 6th Symposium, Albuquerque, NM, Jan. 8-12, 1989. Vol. 2 (A93-20752 06-20)
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Funding Number(s)
CONTRACT_GRANT: F33615-87-C-2746
Distribution Limits
Public
Copyright
Other