Originally Posted by: Razonar Actually I ask some time ago something like this related with derivatives of cool prop package).
That's interesting, Alvaro.
My understanding is that the underlying equations are IAPWS, to be tracable.
As implemented in Smath just a cluster fuck. OK, I don't need, using WASP
from Katmar. Under the hood, those functions are monkey business. I say that
because I coded those animals from personal transmission from Bernhard S.
I coded in VB. ALL OK, coded nearly all in Mathcad OK.
About your point of getting the derivative in Smath: not possible.
Not possible unless CoolProp re-coded from A ...Z.
In Smath CoolProp, you just get the interpolated value.
Most probably, those properties are respective data sets, interpolated.
IAPWS are a soup of polynomials. Correctly implemented, you will have
them on plot and derivatives.
I believe this package is the one from Valery at the time of his
web Mathcad calculator.
If interested, can check if still on my MCD 11.
I have most of IAPWS in Smath otherwise approximated, hyper accurate !
Cheers Alvaro ... Jean
PS: WASP from Katmar is not freeware but you have unlimited sessions
of 3 minutes [originally it was 10 minutes].