Examples¶
State Point¶
Create a listing of properties at a given T and D:
from engcoolprop.ec_fluid import EC_Fluid
# Print state point
ec = EC_Fluid(symbol="N2", T=530.0,P=100.0 ) # T=degR, P=psia
ec.setProps(T=500., D=0.1) # Set T and D
ec.printProps() # Print state point at given T,P
Ouput:
State Point for fluid Nitrogen (N2)
T = 500 degR (Tc= 227.146 , Tnbp= 139.239 Ttriple= 113.672 )
P = 19.1444 psia (Pc= 492.519 )
D = 0.1 lbm/cu ft (Dc= 19.5587 )
E = 88.3793 BTU/lbm
H = 123.806 BTU/lbm
S = 1.59617 BTU/lbm degR
Cv=0.177465 BTU/lbm degR
Cp=0.248873 BTU/lbm degR
g = 1.40238 Cp/Cv (-)
A = 1115 ft/sec
V = 1.13254 viscosity [1.0E5 * lb/ft-sec]
C =0.0140818 thermal conductivity [BTU/ft-hr-R]
MW= 28.0135 lbm/lbmmole
Q = -1 Vapor Quality (mass fraction gas)
Z =0.999722 (-)
Critical Properties¶
Create a listing of critical properties:
from engcoolprop.ec_fluid import EC_Fluid
ec = EC_Fluid(symbol="O2", T=530.0,P=100.0 ) # T=degR, P=psia
ec.printCriticalProps() # Print critical properties
Output:
Critical Properties for fluid Oxygen (O2)
Tc= 278.246 degR
Tnbp= 162.338 degR
Pc = 731.425 psia
Dc = 27.2276 lbm/cu ft
MW= 31.9988 lbm/lbmmole
Zc =0.287943 (-)
Hc = 13.9393 BTU/lbm
Ec = 8.96846 BTU/lbm
Sc = 1.00335 BTU/lbm degR
Ac = 502.502 ft/sec
Vc = nan viscosity [1.0E5 * lb/ft-sec]
Cc =0.0221309 thermal conductivity [BTU/ft-hr-R]
Table of Values¶
Create a table of properties:
from engcoolprop.ec_fluid import EC_Fluid
ec = EC_Fluid(symbol="AR")
print('Properties for: %s (%s)'%(ec.name, ec.symbol) )
for T in range(460, 570, 10):
ec.setProps(T=T, P=14.7)
ec.printTPD()
Output:
Properties for: Argon (AR)
AR T= 460.0 P= 14.7 D=0.1191 E= 34.21 H= 57.05 S=0.906 Q=-1.00
AR T= 470.0 P= 14.7 D=0.1166 E= 34.96 H= 58.30 S=0.908 Q=-1.00
AR T= 480.0 P= 14.7 D=0.1141 E= 35.71 H= 59.55 S=0.911 Q=-1.00
AR T= 490.0 P= 14.7 D=0.1118 E= 36.46 H= 60.79 S=0.914 Q=-1.00
AR T= 500.0 P= 14.7 D=0.1095 E= 37.21 H= 62.04 S=0.916 Q=-1.00
AR T= 510.0 P= 14.7 D=0.1074 E= 37.95 H= 63.29 S=0.919 Q=-1.00
AR T= 520.0 P= 14.7 D=0.1053 E= 38.70 H= 64.53 S=0.921 Q=-1.00
AR T= 530.0 P= 14.7 D=0.1033 E= 39.45 H= 65.78 S=0.923 Q=-1.00
AR T= 540.0 P= 14.7 D=0.1014 E= 40.20 H= 67.02 S=0.926 Q=-1.00
AR T= 550.0 P= 14.7 D=0.0995 E= 40.94 H= 68.27 S=0.928 Q=-1.00
AR T= 560.0 P= 14.7 D=0.0978 E= 41.69 H= 69.52 S=0.930 Q=-1.00
TD Plot¶
Create a TD plot using CoolProp plotting routine:
from CoolProp.Plots.Common import BasePlot, PropertyDict, BaseDimension
from engcoolprop.ec_fluid import EC_Fluid
symbol = 'N2'
class ENGunits(PropertyDict):
def __init__(self):
self._D = BaseDimension(add_SI=0.0, mul_SI=1./16.01843417, off_SI=0.0, label='Density', symbol=u'd', unit=u'lbm/ft3')
self._H = BaseDimension(add_SI=0.0, mul_SI=0.000429923, off_SI=0.0, label='Specific Enthalpy',symbol=u'h', unit=u'BTU/lbm')
self._P = BaseDimension(add_SI=0.0, mul_SI=1.0/6894.76, off_SI=0.0, label='Pressure', symbol=u'p', unit=u'psia')
self._S = BaseDimension(add_SI=0.0, mul_SI=0.0002388461,off_SI=0.0, label='Specific Entropy', symbol=u's', unit=u'BTU/lbm/R')
self._T = BaseDimension(add_SI=0.0, mul_SI=1.8, off_SI=0.0, label='Temperature', symbol=u'T', unit=u'R')
self._U = BaseDimension(add_SI=0.0, mul_SI=0.000429923, off_SI=0.0, label='Specific Internal Energy', symbol=u'u', unit=u'BTU/lbm')
self._Q = BaseDimension(add_SI=0.0, mul_SI=1.0, off_SI=0.0, label='Vapour Quality', symbol=u'x', unit=u'')
BasePlot.UNIT_SYSTEMS['ENG'] = ENGunits() # ['EUR','KSI','SI']
ec = EC_Fluid(symbol)
ec.printCriticalProps()
# Plot Types: 'PS', 'PT', 'HS', 'TS', 'PD', 'TD', 'PH'
# tp_limits: 'NONE', 'DEF','ACHP','ORC'
plot = PropertyPlot(symbol, 'TD', unit_system='ENG', tp_limits='DEF')
plot.calc_isolines(CP.iHmass, num=11)
plot.calc_isolines(CP.iQ, num=11)
plot.title('%s (%s)'%(ec.name, ec.symbol))
plot.grid()
plot.show()
And printed Output:
Critical Properties for fluid Nitrogen (N2)
Tc= 227.146 degR
Tnbp= 139.239 degR
Pc = 492.519 psia
Dc = 19.5587 lbm/cu ft
MW= 28.0135 lbm/lbmmole
Zc =0.289458 (-)
Hc = 12.5678 BTU/lbm
Ec = 7.90791 BTU/lbm
Sc = 1.00671 BTU/lbm degR
Ac = 444.365 ft/sec
Vc = 1.22997 viscosity [1.0E5 * lb/ft-sec]
Cc = 886.461 thermal conductivity [BTU/ft-hr-R]
