A peer-reviewed study tested a carbon dioxide filter whose coated fibers heat up under electrical current, releasing captured gas for reuse. Laboratory trials measured capture and regeneration, while simulations explored indoor ventilation. The modeled energy balance varied by season and carbon dioxide target, with some summer conditions increasing consumption. Occupied-building performance remains untested.
A single peer-reviewed laboratory study prepared a reusable carbon dioxide filter by coating carbon fibers with amine-functionalized silica particles. Minjae Kim and colleagues used the fibers as electrical heating elements. The coating captures gas; heating releases it so that the same material can begin another capture cycle. Indoor ventilation was examined separately through simulations.[1]
At a temperature of 100 degrees, the filter released 95 per cent of the captured gas in 15 minutes. Reaching that fraction took approximately 35 minutes at 80 degrees. At 60 degrees, release remained incomplete after 120 minutes. These measurements came from laboratory equipment rather than occupied-building trials.[1]
Across ten filter cycles, capture capacity averaged around 0.95 millimoles per gram, varying by less than 5 per cent. Humidity affected uptake because water and carbon dioxide competed for adsorption sites. The coating and its electrical heating were tested as linked parts of the reusable filter.[1]
Room simulations combined laboratory kinetics with simplified ventilation. A winter target of 600 parts per million corresponded to approximately 25 per cent net energy savings in the model. At a summer target of 1,000 parts per million, total consumption was approximately 30.6 per cent higher when filter regeneration was included. The calculations assumed a well-mixed room and did not establish performance under real occupancy patterns.[1]
