Python list inputs

[jowr]

There is a problem with Python lists, #390 is not a water problem, but a Python issue:

from __future__ import print_function, division
import CoolProp
from CoolProp.CoolProp import PropsSI

print(CoolProp.__version__)
print(CoolProp.__gitrevision__)

fluid='water'
pi = 700e5

l  = "V"
T = 500
print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))
T = 700
print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))

l  = "L"
T = 500
print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))
T = 700
print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))

T = [500,700]
l  = "V"
print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))
l  = "L"
print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))

5.0.6dev
83a670a4fa142416e13444f54c95e162bb55d26b
V: 0.000133532211873 at 700.0 bar
V: 6.96495292947e-05 at 700.0 bar
L: 0.697429695478 at 700.0 bar
L: 0.449613314229 at 700.0 bar
V: [ 0.00013353  0.00013353] at 700.0 bar
L: [ 0.6974297  0.6974297] at 700.0 bar

[jowr]

This is also not a Python problem, the problem lies deeper on the C++ level.

[500.0, 700.0] [70000000.0, 70000000.0]
../../src/CoolProp.cpp:102: backend extracted. backend: ?. fluid: water
../../src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp (880): update called with (7: (PT_INPUTS), 7e+07, 500)
AbstractState: keyed_output called for viscosity 
../../src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp (880): update called with (7: (PT_INPUTS), 7e+07, 700)
AbstractState: keyed_output called for viscosity 
V: [ 0.00013353  0.00013353] at 700.0 bar
[500.0, 700.0] [70000000.0, 70000000.0]
../../src/CoolProp.cpp:102: backend extracted. backend: ?. fluid: water
../../src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp (880): update called with (7: (PT_INPUTS), 7e+07, 500)
AbstractState: keyed_output called for conductivity 
AbstractState: keyed_output called for Dmass 
../../src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp (880): update called with (7: (PT_INPUTS), 7e+07, 700)
AbstractState: keyed_output called for conductivity 
L: [ 0.6974297  0.6974297] at 700.0 bar

[jowr]

It looks like it is the Helmholtz backend, do the transport properties get reset during update? Is the cahce cleared?

def printLine(l,T,pi):
    print("{0}: {1} at {2} bar".format(l,PropsSI(l,"T",T,"P",pi,fluid),pi/1e5))

T = [500,700]
pi = 700e5
printLine("V",T,pi)
printLine("L",T,pi)
printLine("D",T,pi)

V: [ 0.00013353  0.00013353] at 700.0 bar
L: [ 0.6974297  0.6974297] at 700.0 bar
D: [ 881.83897192  582.34028737] at 700.0 bar