Free (standard conforming) library to model mechanical (1D/3D), electrical (analog, digital, machines), magnetic, thermal, fluid, control systems and hierarchical state machines. Also numerical functions and functions for strings, files and streams are included.
It started from unit-checking MSL which detected something odd in:
Modelica.Media.Air.ReferenceMoistAir.Utilities.VirialCoefficients.Bww_dT specifically the line:
It might be that bww on the line before is a "temporary" with a different unit, which could explain the unit-error.
However, regardless of that the style of ..../rhored*MM is a bit confusing to me (I have to spend a few second to remember the precedence). I would write ...*MM/rhored - to clarify the meaning. The same issue occurs in Modelica.Media.Air.ReferenceMoistAir.Utilities.Water95_Utilities - where criticalMolarVolume=1/322.0*0.018015268 (using identical literal values instead of constants - thus bypassing any unit-check).
But, that made me think once more: MM/rhored has unit [kg/mol]/[mol/m3]=[kg.m3.mol-2] whereas MolarVolume used for criticalMolarVolume has unit [m3.mol-1]. Is it just coincidence that it is the same values - or is there some additional issue? I know a factor of 1kg/m3 or 1000kg/m3 is easy to slip by for air or water; but that wouldn't explain it.
It could be:
Incorrect units for something.
Incorrect formula.
A missing conversion that happen to have the value 1 for some reason.
Issues listed below:
It started from unit-checking MSL which detected something odd in: Modelica.Media.Air.ReferenceMoistAir.Utilities.VirialCoefficients.Bww_dT specifically the line:
It might be that
bwwon the line before is a "temporary" with a different unit, which could explain the unit-error.However, regardless of that the style of
..../rhored*MMis a bit confusing to me (I have to spend a few second to remember the precedence). I would write...*MM/rhored- to clarify the meaning. The same issue occurs inModelica.Media.Air.ReferenceMoistAir.Utilities.Water95_Utilities- wherecriticalMolarVolume=1/322.0*0.018015268(using identical literal values instead of constants - thus bypassing any unit-check).But, that made me think once more:
MM/rhoredhas unit [kg/mol]/[mol/m3]=[kg.m3.mol-2] whereas MolarVolume used for criticalMolarVolume has unit [m3.mol-1]. Is it just coincidence that it is the same values - or is there some additional issue? I know a factor of 1kg/m3 or 1000kg/m3 is easy to slip by for air or water; but that wouldn't explain it.It could be: