Carbon Dioxide Removal System (CDRS) Design for Gateway International Habitation Module

JAXA is developing a Carbon Dioxide Removal System (CDRS) for the Gateway International Habitation Module (I-HAB). CDRS is an amine-based regenerative system that absorbs the CO2 exhaled by the crew and desorbs it through heating and venting to space. This study focuses on dew point optimization and heater design improvements to reduce power consumption and extend system life. Experiments showed that increasing the dew point up to -15 °C maintained CO₂ removal performance while reducing desiccant heater power, leading to a 25 % desiccant heater power reduction. Optimizing the heater thermal coupling improved temperature uniformity, reducing maximum temperature variation by 15 °C. These findings will be incorporated into the Engineering Model (EM) to further validate the CDRS feasibility as an I-Hab system.