ianhbell
commented
6 months ago Error code 117 should be a fatal error (-117 on the other hand would be ok). So by rights you should not get any results if the setup does not work. I guess that the presence of HCl is the problematic component since interaction parameters with other components are probably impossible.
Recommend to call ERRMSGdll after the failed setup
P.S. Very(!) nice issue report. Clearly you've done this sort of thing before.
Here is my code:
from ctREFPROP.ctREFPROP import REFPROPFunctionLibrary, REFPROPInstance # type: ignore
from os import getcwd
pressure = 145138.42
mix = [
('HYDROGEN.FLD', 0.346829),
('NITROGEN.FLD', 0.002203),
('CO.FLD', 0.103263),
('CO2.FLD', 0.318607),
('METHANE.FLD', 0.030366),
('ETHANE.FLD', 0.018206),
('PROPANE.FLD', 0.159881),
('ISOBUTAN.FLD', 0.006154),
('BUTANE.FLD', 0.002821),
('IPENTANE.FLD', 0.001154),
('PENTANE.FLD', 0.000641),
('22DIMETHYLBUTANE.FLD', 0.001282),
('WATER.FLD', 0.007821),
('HCL.FLD', 0.000003),
('H2S.FLD', 0.000769),
]
fluid_str = ';'.join([f'{fluid}' for fluid, _ in mix])
z = [x for _, x in mix]
import os
root = os.getenv('HOME') + '/REFPROP10'
dll: REFPROPInstance = REFPROPFunctionLibrary(root)
dll.SETPATHdll(root)
iUnits: int = dll.GETENUMdll(0, 'MASS BASE SI')[0]
iFlag: int = 1
setup_ierr = dll.SETFLUIDSdll(fluid_str)
if setup_ierr not in [0, -117]:
msg = dll.ERRMSGdll(setup_ierr)
raise Exception(f'Failed to set fluid mixture! {setup_ierr} w/ message "{msg}"')
r = dll.REFPROP2dll("", 'PQ', 'T', iUnits, iFlag, pressure, 1.0, z)
t_dew = r.Output[0]
if r.ierr != 0:
raise Exception(f'Failed to calculate dew point temperature! {r.herr}')
print()
print(setup_ierr)
print()
print(r)
print()
print(t_dew - 273.15)
print()yielding
Exception: Failed to set fluid mixture! 117 w/ message "[SETUP error 117] Estimation of mixing parameters is not possible for most mixtures containing water, helium, hydrogen, neon, carbon monoxide, fluorine, methanol, or ethanol."which clarifies why things didn't work. I expect you would have gotten the same error message in the GUI but continued on anyhow?
JamesYatesHowden
nist-aharvey
Description
I am running a dew point temperature flash using the refprop dll in python.
The answer I get via the dll is VERY different to the answer I get using the same version of refprop via the GUI.
If I were to take a partial pressure approach, the GUI version is in the range I'd expect the dew point to be.
Steps to Reproduce
Expected behavior: GUI value: 8.73C
Actual behavior: dll value: -51.55C
Versions
REFPROP Version: 10.0 Operating System and Version: Windows 10 Access Method: Python