Refrigerant Management System
Working Fluid Charge Management and Monitoring
A refrigerant management system regulates working fluid volume, monitors fluid quality, and detects micro-leaks within heat pump loops. Operating as part of an active thermal control system, it utilizes stainless steel tubing, hermetic service valves, accumulators, and capacitance sensors to maintain proper charge levels and prevent coefficient of performance degradation. In the lunar vacuum, any leak results in permanent charge loss that cannot be replaced without in-situ resource utilization. The system must therefore maintain 100-year hermetic sealing across all connections, utilizing ultrasonic leak detection to isolate micro-leaks and prevent joint fatigue failures caused by thermal cycling.
System managing refrigerant charge level, leak detection, and fluid quality in heat pump loops
Purpose
Maintain proper refrigerant charge and detect leaks to prevent heat pump performance degradation
Context
Child of L2-TCS-HPMP in the Active Thermal Control System
Principles
- ▸Refrigerant charge level affects COP - over/under-charge reduces efficiency
- ▸Ultrasonic leak detection identifies micro-leaks before significant charge loss
- ▸Accumulator/receiver manages charge during varying operating conditions
- ▸Refrigerant quality monitoring detects contamination or decomposition products
Typical implementations
- ▸ISS IATCS (Internal Active TCS) fluid monitoring
- ▸Automotive A/C charge management systems adapted
- ▸Industrial refrigeration leak detection systems
Lunar considerations
- ▸Zero-leak requirement in vacuum - any leak is permanent charge loss
- ▸No refrigerant resupply unless ISRU can synthesize working fluid
- ▸100-year hermetic sealing of all refrigerant connections
- ▸Must accommodate thermal cycling without joint fatigue failures
Specifications
Functional
| primary function | System managing refrigerant charge level, leak detection, and fluid quality in heat pump loops |
Physical
| materials | Stainless steel tubing, Hermetic service valves, Capacitance charge sensors |
Interfaces
Provides
- Managed refrigerant supply to compressor
Requires
- Charge monitoring data for thermal control decisions
Cite this entry
Lunar Ark Codex. "Refrigerant Management System" (L3-TCS-HPMP-REFR). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-TCS-HPMP-REFR
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.