Overview
A sealed human habitat is conventionally kept alive by a stack of independent subsystems: CO₂ scrubbers, dehumidifiers, air conditioners, potable-water units and biological-control hardware, each with its own power budget, consumables, maintenance and failure modes. ARBOK-LIFESPHERE argues this fragmentation is an engineering artifact rather than a physical necessity: carbon dioxide, humidity, heat, water demand and microbial growth are five consequences of one biological process — a human respiring inside a closed volume. The concept treats the habitat atmosphere as one coupled thermodynamic system. Moisture exhaled by the crew is recovered in a vacuum condensation loop; the condensate serves as the transport medium for physical, sorbent-free CO₂ removal by deep-vacuum phase separation; the same loop performs thermoregulation through high-fraction heat recuperation without refrigerant; and the recovered water is returned to the cycle as potable and technical water. Target duty is achieved with zero chemical consumables, near-silent operation and a single architecture. The distinctive claim is not "no consumables" alone (CDRA and amine swing systems already achieve regenerable, consumable-free CO₂ rejection to vacuum) but integration — folding CO₂ capture, dehumidification, thermoregulation, water recovery and biological stability into one shared phase cycle.
Applications
Platform-agnostic in principle. Conventional and nuclear submarines and autonomous underwater vehicles, where acoustic stealth and consumable-free endurance are decisive. Orbital and planetary modules, where launched consumable mass and closed-loop water dominate the cost equation. A submarine is among the hardest closed-habitat cases and is proposed as the proving ground.
Operating Principle
The unifying physical principle is phase separation under deep vacuum — the same family of processes ARBOK applies in its evaporation and cold-evaporation platforms for water and dissolved-gas treatment. Under deep vacuum the solubility of dissolved gases falls toward zero and they separate from the liquid phase; condensation and controlled evaporation move both water and heat; with no warm open water and no dissolved oxygen in the product, the biological habitat is removed by design rather than by chemical suppression.
Stage 1 — Condensation and heat recuperation. Warm, humid cabin air (nominally 35 °C, near 100% relative humidity in the exhaled stream) is drawn through a vacuum condensation loop. Moisture is extracted, latent heat is captured for recuperation, and the condensate carries dissolved CO₂ out of the air stream. Because the stage operates under vacuum, the same low-pressure environment that drives condensation is hostile to micro-organisms, so disinfection is achieved physically — without filters, lamps or consumables.
Stage 2 — CO₂ removal by vacuum phase separation. The CO₂-bearing condensate is processed in a deep-vacuum stage (ARBOK-Evaporation principle), where dissolved-gas solubility is driven toward zero and CO₂ is released as a separate, controlled stream rather than being chemically bound. On a submarine this stream is exhausted overboard against sea pressure; in space it vents to vacuum. Cleaned water returns to the loop. No lithium hydroxide, no amine, no replaceable cartridge.
Stage 3 — Thermoregulation by recuperation. No refrigerant compressor. Heat captured during condensation is recuperated at a high fraction — on the order of 98% in ARBOK phase-machine practice — and the set-point temperature is governed by regulating the recuperation level at the outlet. Recovered heat can be diverted to warm the boat and its subsystems; when cooling is required, cabin air is returned cool, with the hull's contact with the surrounding cold water acting as the ambient reference. No freon is used.
Stage 4 — Water recovery and biological stability. Recovered water returns to the cycle as potable and technical water. The absence of dissolved oxygen in the product suppresses bacterial growth; the LinkedIn text additionally attributes suppression of fungi, bacterial colonies and biofilms to lower humidity itself. An inline real-time water-quality laboratory governs the output with automatic shutdown on any anomaly, replacing slow off-line sampling.
Stated limitations of the principle. CO₂ is only weakly soluble in water at the partial pressures present in a habitat (sub-percent to a few percent). Henry's-law equilibrium therefore implies that capturing CO₂ purely by physical dissolution into water demands either large liquid recirculation rates and contactor area, or enhancement of the absorption step — for example an elevated-pressure absorber, a buffered/reactive medium, or a carbonic-anhydrase-assisted contactor. The vacuum desorption step itself is thermodynamically straightforward; the absorption step is where the design margin must be proven. The ultimate heat sink in a fully sealed volume must be made explicit for each platform (hull-to-seawater conduction for a submarine; a radiator for a spacecraft), since recuperation redistributes heat but cannot, by the First Law, make a net metabolic heat load disappear without an external sink.
Key Parameters
Reference duty: 12 crew, sealed air volume on the order of 400 m³, 90-day patrol.
| Parameter | Value |
|—|—|
| CO₂ generation per person | ~0.9 kg·person⁻¹·day⁻¹ |
| Water addition per person | ~1 L·person⁻¹·day⁻¹ |
| Crew | 12 |
| Sealed air volume | order of 400 m³ |
| Daily CO₂ generation (crew of 12) | ~10.8 kg |
| Daily water addition (crew of 12) | ~12 L |
| CO₂ over 90-day patrol | ~970 kg (approaching one tonne) |
| Water over 90-day patrol | ~1,080 L (above one tonne) |
| LiOH consumption of a comparable scrubber | 1.1–1.4 kg LiOH per kg CO₂ |
| LiOH reagent rate at ~10.8 kg CO₂/day | roughly 12–15 kg per day, exceeding one tonne over the 90-day patrol |
| ARBOK-LIFESPHERE reagent consumption | zero, over any mission length |
| Energy, ARBOK phase-separation platform | 0.65–1 kWh per tonne of processed water (real grid energy) |
| Energy, reverse osmosis (comparison) | 5–15 kWh per tonne |
| Thermal recuperation fraction | on the order of 98% |
| Water recovery (ARBOK cold-evaporation practice, submarine water supply) | full (100%) recovery |
| Energy vs. reverse osmosis (cold-evaporation practice) | on the order of ten times lower |
| Acoustic emission (cold-evaporation practice) | near 40 dB |
| Radionuclide separation (nuclear vessels) | automatic separation of Cs, Sr, Co, I in the event of a reactor leak |
| Inlet air condition (Stage 1) | nominally 35 °C, near 100% relative humidity in the exhaled stream |
| Operating regime | 24/7 |
| Design service life | up to 20 years |
| TRL | 4 |
Note from the source: the energy figures above are platform-level figures from ARBOK water and gas-separation practice; the integrated air-side duty must be confirmed by the prototype programme.
Architecture and Components
Four coupled stages sharing one water inventory and one thermal recuperation network: (1) vacuum condensation loop with latent-heat capture; (2) deep-vacuum CO₂ phase-separation stage with overboard/vacuum discharge of the CO₂ stream; (3) recuperative thermoregulation network with outlet-side recuperation-level control, no refrigerant compressor; (4) water recovery returning potable and technical water, with an inline real-time water-quality laboratory and automatic shutdown on anomaly. The four stages are not four machines; they are one loop in which the water inventory, the vacuum environment and the thermal recuperation network are shared. No membranes, no filters, no chemical absorbers, no consumables, no cartridge swaps.
Advantages
Consolidation of four-to-five subsystems into one architecture, reducing aggregate power, mass, spares and failure points. Elimination of chemical consumables for CO₂ removal — no LiOH, no amine, no cartridges. Closed-loop water with full recovery and no brine. Refrigerant-free thermoregulation. Architectural rather than chemical control of biological growth. Near-silent operation (no high-pressure pumps, no swing-bed valve cycling) against the marked acoustic signature of RO pumps and the moving parts of amine swing systems — for a submarine or AUV acoustic stealth is a survival parameter, not a comfort parameter. Fewer moving parts and no consumable changeouts reduce the number of independent failure and maintenance events over the design service life. Zero reagent mass eliminates both the launched/loaded mass and the associated logistics and disposal.
Integrations
Built on ARBOK internal platforms cited in the source: ARBOK phase-separation and ARBOK-Evaporation (deep-vacuum phase separation of dissolved gases in water), ARBOK cold evaporation for submarine water supply, ARBOK-CycloCool and DRY CLOUD (recuperative and phase-change thermal management). Platform interfaces: overboard CO₂ discharge against sea pressure (submarine) or venting to vacuum (space); hull-to-seawater conduction or a spacecraft radiator as the external heat sink; potable and technical water distribution.
Related internal references: ARBOK-CoolTower · DRY CLOUD · ARBOK-Evaporation
Deployment & Operation
Design intent is 24/7 operation with a service life of up to 20 years. Operation is consumable-free — no cartridge swaps, no reagent resupply, at any mission length. Output water quality is governed by an inline real-time laboratory with automatic shutdown on any anomaly, replacing slow off-line sampling.
Validation sequence proposed by the source: (1) computational fluid-dynamics and mass-transfer modelling of the coupled condensation, absorption and vacuum-desorption stages at habitat-representative partial pressures; (2) a bench contactor measuring CO₂ captured per litre circulated and the vacuum energy to strip it, benchmarked in watts and kilograms-circulated per kilogram-CO₂ against CDRA-class systems; (3) an integrated prototype confirming the shared water and thermal balances at the 12-person scale.
TRL
TRL-4 (as stated in both sources).
Remaining to advance: the CFD-and-prototype validation programme described in section 9; confirmation of the integrated air-side energy duty (current energy figures are platform-level, from ARBOK water and gas-separation practice); proof of the CO₂ absorption margin; explicit definition of the platform heat sink.
Market Potential
[требует уточнения из базы] — the sources identify the addressable platforms (conventional and nuclear submarines, AUVs, orbital and planetary modules) and the drivers (acoustic stealth, consumable-free endurance, launched consumable mass, closed-loop water), but give no market size, pricing or customer count.
Typical Project Economics
No CAPEX, OPEX, price or payback figures are given in the sources. Economically relevant quantities stated: avoided reagent of roughly 12–15 kg LiOH per day, exceeding one tonne over a 90-day patrol, with the associated launched/loaded mass, logistics and disposal removed; processing energy of 0.65–1 kWh per tonne of water against 5–15 kWh per tonne for reverse osmosis; thermoregulation performed by recuperation (≈98%) rather than by a compressor lifting heat across a temperature gradient with shaft work; reduced spares and maintenance events over a design service life of up to 20 years. Full project economics —
Risk Factors
Principal physico-chemical risk stated in the source: CO₂ is only weakly soluble in water at habitat partial pressures (sub-percent to a few percent). Henry's-law equilibrium implies that capturing CO₂ purely by physical dissolution demands either large liquid recirculation rates and contactor area, or enhancement of the absorption step (elevated-pressure absorber, buffered/reactive medium, or carbonic-anhydrase-assisted contactor). The vacuum desorption step is thermodynamically straightforward; the absorption step is where the design margin must be proven.
Heat sink: the ultimate heat sink in a fully sealed volume must be made explicit for each platform, since recuperation redistributes heat but cannot, by the First Law, make a net metabolic heat load disappear without an external sink.
Data basis: the quoted energy and recovery figures are platform-level, taken from ARBOK water and gas-separation practice; the integrated air-side duty is unconfirmed until the prototype programme is executed.
Competitive position: CDRA and amine swing systems already achieve regenerable, consumable-free CO₂ rejection to vacuum, so the claim rests on integration rather than on consumable-free operation alone.
Maturity: the concept is at TRL-4 and at concept stage, dependent on funding for the CFD-and-prototype validation programme.
Related Technologies
ARBOK-CoolTower · DRY CLOUD · ARBOK-Evaporation · ARBOK PURI · ARBOK-AIR ALARKO