Improved Operation of CO
Separator for Preventing Increases in CO
Concentration of Air in the Habitation Room during Closed Habitation Experiments
The main objective of the activities of the Closed Ecology Experiment Facilities (CEEF) is to construct a mathematical model to predict the transfer of radiocarbon (14C) released from a nuclear fuel reprocessing plant in the village of Rokkasho into the local ecosystem. For this purpose, an artificial ecosystem, including crops, domestic animals, and human inhabitants, needs to be maintained in the CEEF for several months. As a preparatory study, two-week habitation experiments using the CEEF were planned in 2006. In the first habitation experiment, a CO2 separator was continuously operated with a cycle of 60-minute adsorption and 60-minute desorption periods in order to remove excess CO2 from the habitation room, and the maximum CO2 concentration of air in this room slightly exceeded 5000 ppm, which was identical to the maximum 8-hour exposure permitted for industrial settings. In the second habitation experiment, therefore, the duration of both the adsorption and desorption periods for the operation of the CO2 separator was shortened to 54 minutes in order to increase the cumulative number of adsorption periods per day. The approx. 10% increase in the cumulative number of adsorption periods per day resulted in a decrease of approx. 10% in the maximum CO2 concentration of air in the habitation room during the second habitation experiment. This result demonstrated how the improved operation of the CO2 separator contributed to maintaining the CO2 concentration of air in the habitation room below the maximum 8-hour exposure permitted for industrial settings.
Citation: Tani, T., Tsuga, S., and Tako, Y., "Improved Operation of CO2 Separator for Preventing Increases in CO2 Concentration of Air in the Habitation Room during Closed Habitation Experiments," SAE Technical Paper 2007-01-3097, 2007, https://doi.org/10.4271/2007-01-3097. Download Citation
Takashi Tani, Shouichi Tsuga, Yasuhiro Tako
International Conference On Environmental Systems
SAE 2007 Transactions Journal of Aerospace-V116-1