IfcMeasureValue nor in
IfcDerivedMeasureValue I can find an appropriate choice for storing CO2 concentration which is usually given in ppm. Is using
IfcInteger really the best available option? Or is the use of
We had a discussion here on unitless / identity units Proposal to split UnitBasis attribute for IfcCostValue into UnitBasis and UnitValue · Issue #71 · buildingSMART/IFC4.3.x-development · GitHub
The tentative conclusion was to add a
COUNTUNIT to IfcUnitEnum, that way you can probably model your ppm as a derived unit of
1e1 COUNT / 1e6 COUNT (but that last part I didn’t work out in detail).
Feel free to chime into the discussion there.
Two psets are dedicated to environmental impacts:
The rigth indicator for CO2 concentration is “climate change” as an IfcMassMeasure because it is the “Quantity of greenhouse gases emitted calculated in equivalent CO2”.
That was actually not what I was intending to do. I am dealing with indoor air quality which is usually given in ppm, CO2 emissions are a different thing…