International Space Station (ISS) Carbon Dioxide Removal Assembly (CDRA) Protoflight Performance Testing

Status of the Correlation Process of the V-HAB Simulation with Ground Tests and ISS Telemetry Data

“…It exits through the water loaded desiccant bed, which humidifies the air before leaving the CDRA. A half cycle takes 144 minutes on ISS 10 .…”

“…The efficiency of CDRA was additionally updated with data obtained from performance tests 10,13 . A detailed description of the physical and chemical processes of CDRA and the dependencies of the Zeolite can be found in a paper dedicated to the topic 14 .…”

Equilibrium Adsorption Isotherms for H2O on Zeolite 13X

“…Removing water from gas streams reduces the potential for several undesirable effects, such as hydrate formation, corrosion, and condensation or freezing of moisture . Moisture removal is also an importaint precursor to adsorption of other constituents; one standout example of critical technical interest is the use of adsorbent beds to dehumidify the cabin air of spacecraft prior to carbon dioxide (CO 2 ) removal. , …”

“…It operates cyclically, employing two desiccant beds and two CO 2 adsorbent beds. As one desiccant bed and one adsorbent bed operate in adsorption mode, the other two beds are desorbing (regenerating) . Halfway through a cycle, the beds switch modes, providing continuous CO 2 removal capability for up to six crew members .…”

“…2 Moisture removal is also an importaint precursor to adsorption of other constituents; one standout example of critical technical interest is the use of adsorbent beds to dehumidify the cabin air of spacecraft prior to carbon dioxide (CO 2 ) removal. 3,4 The Carbon Dioxide Removal Assembly (CDRA) is a stateof-the-art CO 2 removal system currently used aboard the International Space Station (ISS). The CDRA operated on fully regenerative thermal-/pressure-swing adsorption process to remove CO 2 from the cabin air.…”