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Record Details

Record 14 of 25426
Investigating Liquid CO2 as a Coolant for a MTSA Heat Exchanger Design
Author and Affiliation:
Paul, Heather L.(NASA Johnson Space Center, Houston, TX, United States)
Padilla, Sebastian(Paragon Space Development Corp., Tucson, AZ, United States)
Powers, Aaron(Paragon Space Development Corp., Tucson, AZ, United States)
Iacomini, Christie(Paragon Space Development Corp., Tucson, AZ, United States)
Abstract: Metabolic heat regenerated Temperature Swing Adsorption (MTSA) technology is being developed for thermal and carbon dioxide (CO 2) control for a future Portable Life Support System (PLSS), as well as water recycling. CO 2 removal and rejection is accomplished by driving a sorbent through a temperature swing of approximately 210 K to 280 K . The sorbent is cooled to these sub-freezing temperatures by a Sublimating Heat Exchanger (SHX) with liquid coolant expanded to sublimation temperatures. Water is the baseline coolant available on the moon, and if used, provides a competitive solution to the current baseline PLSS schematic. Liquid CO2 (LCO2) is another non-cryogenic coolant readily available from Martian resources which can be produced and stored using relatively low power and minimal infrastructure. LCO 2 expands from high pressure liquid (~5800 kPa) to Mars ambient (0.8 kPa) to produce a gas / solid mixture at temperatures as low as 156 K. Analysis and experimental work are presented to investigate factors that drive the design of a heat exchanger to effectively use this sink. Emphasis is given to enabling efficient use of the CO 2 cooling potential and mitigation of heat exchanger clogging due to solid formation. Minimizing mass and size as well as coolant delivery are also considered. The analysis and experimental work is specifically performed in an MTSA-like application to enable higher fidelity modeling for future optimization of a SHX design. In doing so, the work also demonstrates principles and concepts so that the design can be further optimized later in integrated applications (including Lunar application where water might be a choice of coolant).
Publication Date: Jan 01, 2009
Document ID:
20090038923
(Acquired Nov 09, 2009)
Subject Category: FLUID MECHANICS AND THERMODYNAMICS
Report/Patent Number: JSC-CN-19034
Document Type: Technical Report
Meeting Information: 40th International Conference on Environmental Systems; 11-15 Jul. 2009; Barcelona; Spain
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Contract/Grant/Task Num: 903184.04.02.03.03
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: PORTABLE LIFE SUPPORT SYSTEMS; HEAT EXCHANGERS; RECYCLING; HIGH PRESSURE; CRYOGENICS; CARBON DIOXIDE; GAS MIXTURES; SORBENTS; OPTIMIZATION; WATER; SUBLIMATION
Availability Source: Other Sources
Availability Notes: Abstract Only
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