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O2 in the space cabin by electrolyzing water. Finn et al.,2 Mulloth and Finn,3 and Hoover and Wankat4 have introduced the concept of the capture and compression of CO2 from the environment using tem- perature swing adsorption compressor to feed a downstream subsystem. An example of this would be the use of a Sabatier reactor to react CO2 present in a space cabin with hydrogen in order to produce methane and water, which would be electrolyzed into water and hydrogen. This would reduce the launch costs of missions by mini- mizing the amount of water needed to resupply the ISS. In order to use the Sabatier reactor, the feed pressure of CO2 must be well above atmospheric. Mulloth et al.5 demonstrate that by utilizing two beds in series, both the recuperation of CO2 from the cabin and the compression required for a Sabatier reaction can be accomplished. The first bed would capture the CO2 from the feed stream, compress it, and feed it into a second bed, which would further compress the CO2 to the required pressure for the Sabatier subsystem. Extensive research has been performed on temperature swing adsorption (TSA) processes for use in heat pumps. Miles and Shelton6 designed and tested a natural gas heat pump employing a high efficiency regenerative cycle for use in residential space heating and cooling. They developed an analytical methodology for prediction of sys- tem performance and optimization. Sward et al.7 developed a model for a TSA heat pump with a partitioned bed for use in adsorptive refrigeration cycles utilizing waste heat to assess wave shapes and study process variations. They found two unexpected results in that velocity reversals occur due to loading increases during desorption and decreases during adsorption, and sections of the bed were not pressurized sequentially with the order instead being dependent on the location of the thermal wave. Some research has been done on TSA for use in sequestration of an adsorbate from a fluid mixture using various methods for temperature control of the adsorbent bed. Merel et al.8 performed TSA experiments of CO2 adsorbed on 13X in order 27PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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