CO2 concentration simulation

I was curious how CO2 concentration changes in a private room, so I ran a simulation.

The conclusion: 20–30 m³ per person of ventilation per room is enough. Roughly that, I'd say.

A predictable result, but being able to look at the time-resolved change was the gain.

Other observations:

The lump-sum rule "0.5 ACH for the whole house is fine" is a bit rough.

Also, continuing to ventilate when no one is home is wasteful from a heating/cooling perspective. The more in-and-out traffic in a home, the more effective demand-controlled ventilation is.

On the other hand, if you consider age-related body odor and similar smells, demand ventilation has downsides too — because little ventilation happens while no one is home.

A ventilation system the occupant can control, like Zehnder Comfohome, is probably best.