Integrated Carbon Dioxide/Moisture Removal System for NASA-ECLSS Coeus Engineering Integrated Carbon Dioxide/Moisture Removal System for NASA-ECLSS

Team Organization Dennis Arnold - Team Leader, Research Jessica Badger - Coordinator, Research Julia Thompson - Research April Snowden

What is a Carbon Dioxide /Moisture Removal System? Air filtering device used in spacecraft environments Removes carbon dioxide, moisture, ammonia, and heat from the air Maintains breathable atmosphere

Past Carbon Dioxide Removal Systems Apollo Command Module Shuttle Shuttle EDO ISS CRV

Apollo Command Module Used heat exchanger with fine capillary wick for water removal Used LiOH canisters for CO2 removal Extensive ground support needed for launch Not a good design for long duration missions

Shuttle Used condensing heat exchanger (CHX) and rotary gas separator to remove water and heat Needed LiOH canisters to provide CO2 removal Needed antibacterial coating on CHX

Shuttle EDO Uses CHX to remove water Uses RCRS to remove CO2 Requires large bed to meet removal requirements Needs fan, and an air save compressor Needs extra LiOH canisters

ISS Uses CHX to remove water to a waste water recovery system Thermally regenerated molecular sieve removes CO2 Two beds 30 min cycle time Requires too much power (800 W compared to 140 W) CHX biofouling problem (mold) Backup LiOH canisters required

CRV Calcium Oxide canisters for water removal LiOH canisters for CO2 removal Non-condensing heat exchanger Removes heat only Long storage life Short usage time

Proposed Space Launch Initiative (SLI) System CO2 and water removal performed by newly developed amine chemical formulations No CHX required No rotary gas/ liquid separator required Vastly improved efficiency No backup LiOH canisters required Absorbent beds are smaller, thus cycle times are longer

Our Primary Focus CO2 & Moisture Removal System (CMRS) Bed Design Heat transfer Mass transfer Pressure drop Surface area for chemical support Manufacturing ease Mechanical reliability

Future Plans Meet with John Graf Obtain RCRS assembly drawings Obtain absorption rates of water and CO2 for new chemical Obtain manufacturing requirements and tolerances Develop computer model of heat transfer and mass flow rates through bed

Questions? Preguntas? Questionne? Bопрос? Kwestie? Ninau? Swali? Spørsmål? Förhöra?