Gemini mCCR Simulator

BUILDING DIVER…

Guided scenarios

Dive

Target depth10 m

Descent rate18 m/min

Ascent rate9 m/min

WorkloadVO₂ 1.1 L/min

Water temperature12 °C

Dual MAV · needle valve

Needle valve O₂ flow0.75 L/min [ ]

Auto-diver (flies setpoint with the O₂ button, adds diluent when the lung is empty)

Setpoint1.20 bar

Diluent

Simulation

Time warp00:00:00

Fault: O₂ cylinder valve closed

O₂ first-stage IP

Fault: needle valve clogged (open it fully to clear) Fault: cell 2 current-limited

Drag to orbit · scroll to zoom · click any part for details. Particles in X-ray: CO₂-laden, scrubbed, O₂ injected, diluent.

PPO₂ cells · inhale head (bar)

CELL 1

1.00

CELL 2

1.00

CELL 3

1.00

FATHOM HUD

Depth10.0 m

P amb2.01 bar

Loop FO₂0.50

Dil PPO₂0.42

Loop volume5.0 L

Ideal loop volume– L

O₂ injection

0.75L/min needle valve

CHOKED · CONST MASS

O₂ button0.0

Metabolic1.10

Net O₂−0.35

Dil flow0.0

O₂ cylinder (2 L, onboard)200 bar

Diluent / bailout · left sidemount (11 L, QC6)200 bar

Split scrubber · 2 × 1.15 kg (812)

Remaining100%

Est. time3:00

Insp. PCO₂ (sim)0.0 mbar

Peak temp12 °C

CO₂ absorbed0.99 L/m

Heat82 W

exhaustedtemperaturereaction front

CO₂ + H₂O → H₂CO₃① CO₂ dissolves in the pellet's surface water film

H₂CO₃ + 2NaOH → Na₂CO₃ + 2H₂O + heat② fast neutralisation by NaOH (catalyst)

Na₂CO₃ + Ca(OH)₂ → CaCO₃ + 2NaOH③ slow step: lime locks CO₂ as chalk, regenerating NaOH

Net: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O, ΔH ≈ −113 kJ/mol. Indicator turns white → violet as pH drops.