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

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

3. 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

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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. Questions? Preguntas? Questionne? Bопрос? Kwestie? Ninau? Swali?
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