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XSteam provides (mostly) accurate steam and water properties from 0 -
1000 bar and from 0 - 2000 °C according to the IAPWS release IF-97. For
accuracy of the functions in different regions see IF-97 Page 4
Also includes thermal conductivity and viscosity, which are not part of
the IF97 release.
Some effort has been made to include the refined function of more recent releases
and also functions for calculations on heavy water. This includes:
IAPWS R4
IAPWS R14
Contributors
In chronological order:
IAPWS
Magnus Holmgren
drunsinn
mohit0749
gonmolina
xjtu-blacksmith
Requirements
There are no requirements for installing pyXSteam with Python 3.6 and up.
Tests require numpy, demos require numpy and matplotlib
Install
run python3 setup.py install
To run unittests you need two additional packages: pytest and numpy. After installing both, just run pytest in
the base directory. The tests use some fixed values from the documentation to make sure that every coefficient
and formula works as intended.
To test if setup was successful, run python3 bin/pyXSteamDemo.py. This will require numpy and matplotlib to be installed.
Nomenclature
All Functions follow the same naming schema: First the wanted property,
then a underscore _, then the wanted input properties Example:
t_ph is temperature as a function of pressure and enthalpy. For a list
of valid functions se below:
Property
Description
t
Temperature (°C or °F)
p
Pressure (bar or psi)
h
Enthalpy (kJ/kg or btu/lb)
v
Specific volume (m3/kg or ft^3/lb)
rho
Density (kg/m3 or lb/ft^3)
s
Specific entropy (kJ/(kg °C) or btu/(lb °F))
u
Specific internal energy (kJ/kg or btu/lb)
Cp
Specific isobaric heat capacity (kJ/(kg °C) or btu/(lb °F))
Cv
Specific isochoric heat capacity (kJ/(kg °C) or btu/(lb °F))
w
Speed of sound (m/s or ft/s)
my
Viscosity (N s/m^2 or lbm/ft/hr)
tc
Thermal Conductivity (W/(m °C) or btu/(h ft °F))
st
Surface Tension (N/m or lb/ft)
x
Vapor fraction
vx
Vapor Volume Fraction
Usage
Simple Example:
from pyXSteam.XSteam import XSteam
steamTable = XSteam(XSteam.UNIT_SYSTEM_MKS)
print(steamTable.hL_p(220.0))
By using the unitSystem Parameter, you can tell XSteam witch Unit System you are using.
Temperature as a function of pressure and enthalpy
t_ps
Temperature as a function of pressure and entropy
t_hs
Temperature as a function of enthalpy and entropy
Pressure
Function
Description
psat_t
Saturation pressure
p_hs
Pressure as a function of h and s.
p_hrho
Pressure as a function of h and rho. Very inaccurate for solid water region since it's almost incompressible!
pmelt_t
Pressure as a function of temperature along the melting curve. Optional parameter to select ice region
psubl_t
Pressure as a function of temperature along the sublimation curve.
Enthalpy
Function
Description
hV_p
Saturated vapor enthalpy
hL_p
Saturated liquid enthalpy
hV_t
Saturated vapor enthalpy
hL_t
Saturated liquid enthalpy
h_pt
Enthalpy as a function of pressure and temperature
h_ps
Enthalpy as a function of pressure and entropy
h_px
Enthalpy as a function of pressure and vapor fraction
h_prho
Enthalpy as a function of pressure and density. Observe for low temperatures (liquid) this equation has 2 solutions
h_tx
Enthalpy as a function of temperature and vapor fraction
Specific volume
Function
Description
vV_p
Saturated vapor volume
vL_p
Saturated liquid volume
vV_t
Saturated vapor volume
vL_t
Saturated liquid volume
v_pt
Specific volume as a function of pressure and temperature
v_ph
Specific volume as a function of pressure and enthalpy
v_ps
Specific volume as a function of pressure and entropy
Density
Function
Description
rhoV_p
Saturated vapor density
rhoL_p
Saturated liquid density
rhoV_t
Saturated vapor density
rhoL_t
Saturated liquid density
rho_pt
Density as a function of pressure and temperature
rho_ph
Density as a function of pressure and enthalpy
rho_ps
Density as a function of pressure and entropy
Specific entropy
Function
Description
sV_p
Saturated vapor entropy
sL_p
Saturated liquid entropy
sV_t
Saturated vapor entropy
sL_t
Saturated liquid entropy
s_pt
Specific entropy as a function of pressure and temperature (Returns saturated vapor enthalpy if mixture)
s_ph
Specific entropy as a function of pressure and enthalpy
Specific internal energy
Function
Description
uV_p
Saturated vapor internal energy
uL_p
Saturated liquid internal energy
uV_t
Saturated vapor internal energy
uL_t
Saturated liquid internal energy
u_pt
Specific internal energy as a function of pressure and temperature
u_ph
Specific internal energy as a function of pressure and enthalpy
u_ps
Specific internal energy as a function of pressure and entropy
Specific isobaric heat capacity
Function
Description
CpV_p
Saturated vapor heat capacity
CpL_p
Saturated liquid heat capacity
CpV_t
Saturated vapor heat capacity
CpL_t
Saturated liquid heat capacity
Cp_pt
Specific isobaric heat capacity as a function of pressure and temperature
Cp_ph
Specific isobaric heat capacity as a function of pressure and enthalpy
Cp_ps
Specific isobaric heat capacity as a function of pressure and entropy
Specific isochoric heat capacity
Function
Description
CvV_p
Saturated vapor isochoric heat capacity
CvL_p
Saturated liquid isochoric heat capacity
CvV_t
Saturated vapor isochoric heat capacity
CvL_t
Saturated liquid isochoric heat capacity
Cv_pt
Specific isochoric heat capacity as a function of pressure and temperature
Cv_ph
Specific isochoric heat capacity as a function of pressure and enthalpy
Cv_ps
Specific isochoric heat capacity as a function of pressure and entropy
Speed of sound
Function
Description
wV_p
Saturated vapor speed of sound
wL_p
Saturated liquid speed of sound
wV_t
Saturated vapor speed of sound
wL_t
Saturated liquid speed of sound
w_pt
Speed of sound as a function of pressure and temperature
w_ph
Speed of sound as a function of pressure and enthalpy
w_ps
Speed of sound as a function of pressure and entropy
Viscosity
Function
Description
my_pt
Viscosity as a function of pressure and temperature
my_ph
Viscosity as a function of pressure and enthalpy
my_ps
Viscosity as a function of pressure and entropy
Thermal Conductivity
Function
Description
tcL_p
Saturated vapor thermal conductivity
tcV_p
Saturated liquid thermal conductivity
tcL_t
Saturated vapor thermal conductivity
tcV_t
Saturated liquid thermal conductivity
tc_pt
Thermal conductivity as a function of pressure and temperature
tc_ph
Thermal conductivity as a function of pressure and enthalpy
tc_hs
Thermal conductivity as a function of enthalpy and entropy
Surface tension
Function
Description
st_t
Surface tension for two phase water/steam as a function of T
st_p
Surface tension for two phase water/steam as a function of p
vapor fraction
Function
Description
x_ph
vapor fraction as a function of pressure and enthalpy
x_ps
vapor fraction as a function of pressure and entropy
vapor volume fraction
Function
Description
vx_ph
vapor volume fraction as a function of pressure and enthalpy
vx_ps
vapor volume fraction as a function of pressure and entropy
Pressure along the Melting and Sublimation Curves
Function
Description
pmelt_t
Pressure along the melting curve as a function of temperature
vx_psubl_tps
Pressure along the sublimation curve as a function of temperature
Available Functions for Heavy Water
Function
Description
my_rhoT
Viscosity as a function of density and temperature
tc_rhoT
Thermal conductivity as a function of density and temperature
Development
pull requests are always wellcome!
code style is enforced by black
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