This is the value for concentration of carbon dioxide in the atmosphere. The default is 400ppm which is considered to be the global current daily average. It is used in ApacheSim for the calculation of room CO2 concentration. The calculation assumes volumetric carbon dioxide concentration of 400ppm unless updated by the user.
The modelling of room carbon dioxide concentration is detailed within ApacheSim Calculation Methods User Guide, Section 11.3 Carbon Dioxide Balance.
