Polar Biotech Incubator: Thermal & Atmospheric Control

Environment

Outside temperature -35 °C

Insulation (wall R-value) 6.0 m²K/W

Habitat systems

Heater power 18 kW

Air exchange rate 1.2 ACH

Stable

Habitat readouts

Internal temp

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CO₂ level

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Net heat balance

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Internal pressure

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How it works

The dome is a lumped thermal mass exchanging heat with the outside through its insulated shell, plus whatever fresh (cold) air is drawn in for ventilation:

Q_wall = A · (T_in − T_out) / R
Q_vent = ṁ_air · c_p · (T_in − T_out)
dT_in/dt = (Q_heater − Q_wall − Q_vent) / C_thermal

R is the wall's thermal resistance (higher = better insulated), A is the dome's surface area, and C_thermal is the lumped thermal mass of the air + structure. Every fresh air-change-per-hour (ACH) that scrubs CO₂ also has to be re-heated from outside temperature — insulation and ventilation trade off directly.

dCO2/dt = P_bio − ACH·(V/3600)·(CO2 − CO2_out)
P V = n R T   (ideal gas law — pressure tracks internal temperature)

Biological load (the incubator's own research organisms) produces CO₂ at a steady rate P_bio; raising the air-exchange rate scrubs it back toward the outside ambient level, but at a heating cost. The status line reads the same limits real closed habitats operate under: keep T_in inside the setpoint band and CO₂ below roughly 5,000 ppm.

Outside temperature — the Arctic's swing from brief summer thaw to deep winter cold.
Insulation (R-value) — thicker/better shell material, cuts conductive loss through the wall.
Heater power — the incubator's active thermal input.
Air exchange rate — fresh-air turnover that scrubs CO₂ but must be reheated.
Autopilot — a simple feedback controller that throttles the heater to hold the setpoint, showing the real control loop the article describes.

Insulated shell Biological load Air / snow particles

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