this is a pretty well tilled field, but jus' one mo' time
gmat
I have been told that the axial fan P-Q curves typically show 'both' units
well, crap
pabst fan curve
the gd thing is using Pa !
so much for mH2O representing a consensus
my question/point was that it seems 'all' fan curves have dual units
AND
those curves are going to have to be understood, and used, by the user to define the fan's output (given the rad's resistance)
OR
all those curves (of the relevant fans) are going to have to be tabulated/transcribed so that the 'calculator' can do the work
hmmm . . .
I "measure" air volume by calculation given its velocity (profile) in a duct, can be expressed in anything desired
I measure air pressure in Pa because I have an inordinately sensitive instrument which outputs only that, obviously this is converted to the units of choice
I read liquid pressures in µA, displayed however, converted to whatever
I use lpm because I have several direct reading flowmeters and that gives me the most resolution
- it is also a simple conversion in the head to gpm
if one is to focus on utility, then the units of choice should be selectable by the user
if I can calculate such, certainly the 'calculator' should be able to do so
(lets eschew the punishment of the SI impaired)
Alchemy
read up on how those Frenchies came to 'measure' a metre
lol