Time to reach a CO₂ threshold in an occupied cabin with limited ventilation - the sizing logic for fresh-air make-up.
Formula
$$ c_{ss} = c_{out} + \frac{N \cdot q_{CO_2}}{\dot V_{fresh}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $q_{CO_2}$ | CO₂ generation rate per person | L/h | ASHRAE 62.1 |
| $\dot V_{fresh}$ | Fresh-air flow | m³/h | HVAC design |
Sources
- ASHRAE 62.1.