Notation | Quantity | Unit |

T | Temperature | K |

p | Pressure | MPa |

h | Enthalpy | kJ/kg |

v | Specific volume | m³/kg |

rho | Density | kg/m³ |

s | Specific entropy | kJ/(kg·°K) |

u | Specific internal energy | kJ/kg |

Cp | Specific isobaric heat capacity | kJ/(kg·°K) |

Cv | Specific isochoric heat capacity | kJ/(kg·°K) |

w | Speed of sound | m/s |

my | Viscosity | Pa·s |

pr | Prandtl | |

kappa | Kappa | |

tc | Thermal Conductivity | W/(m·°K) |

st | Surface Tension | N/m |

x | Vapour fraction (0-1) | - |

vx | Vapour Volume Fraction (0-1) | - |

Function | Parameters | Return | Description |

Tsat_p | p | T | Saturation temperature |

Tsat_s | s | T | Saturation temperature |

T_ph | p, h | T | Temperture as a function of pressure and enthalpy |

T_ps | p, s | T | Temperture as a function of pressure and entropy |

T_hs | h, s | T | Temperture as a function of enthalpy and entropy |

Function | Parameters | Return | Description |

psat_T | T | p | Saturation pressure |

psat_s | s | p | Saturation pressure |

p_hs | h, s | p | Pressure as a function of h and s |

p_hrho | h, rho | p | Pressure as a function of h and rho (density). Very unaccurate for solid water region since it's almost incompressible! |

Function | Parameters | Return | Description |

hV_p | p | h | Saturated vapour enthalpy |

hL_p | p | h | Saturated liquid enthalpy |

hV_T | T | h | Saturated vapour enthalpy |

hL_T | T | h | Saturated liquid enthalpy |

h_pT | p, T | h | Entalpy as a function of pressure and temperature |

h_ps | p, s | h | Entalpy as a function of pressure and entropy |

h_px | p, x | h | Entalpy as a function of pressure and vapour fraction |

h_Tx | T, x | h | Entalpy as a function of temperature and vapour fraction |

h_prho | p, rho | h | Entalpy as a function of pressure and density. Observe for low temperatures (liquid) this equation has 2 solutions (Not valid!!) |

Function | Parameters | Return | Description |

vV_p | p | v | Saturated vapour volume |

vL_p | p | v | Saturated liquid volume |

vV_T | T | v | Saturated vapour volume |

vL_T | T | v | Saturated liquid volume |

v_pT | p, T | v | Specific volume as a function of pressure and temperature |

v_ph | p, h | v | Specific volume as a function of pressure and enthalpy |

v_ps | p, s | v | Specific volume as a function of pressure and entropy |

Function | Parameters | Return | Description |

rhoV_p | p | rho | Saturated vapour density |

rhoL_p | p | rho | Saturated liquid density |

rhoL_T | T | rho | Saturated vapour density |

rhoV_T | T | rho | Saturated liquid density |

rho_pT | p, T | rho | Density as a function of pressure and temperature |

rho_ph | p, h | rho | Density as a function of pressure and enthalpy |

rho_ps | p, s | rho | Density as a function of pressure and entropy |

Function | Parameters | Return | Description |

sV_p | p | s | Saturated vapour entropy |

sL_p | p | s | Saturated liquid entropy |

sV_T | T | s | Saturated vapour entropy |

sL_T | T | s | Saturated liquid entropy |

s_pT | p, T | s | Specific entropy as a function of pressure and temperature (Returns saturated vapour entalpy if mixture) |

s_ph | p, h | s | Specific entropy as a function of pressure and enthalpy |

Function | Parameters | Return | Description |

uV_p | p | u | Saturated vapour internal energy |

uL_p | p | u | Saturated liquid internal energy |

uV_T | T | u | Saturated vapour internal energy |

uL_T | T | u | Saturated liquid internal energy |

u_pT | p, T | u | Specific internal energy as a function of pressure and temperature |

u_ph | p, h | u | Specific internal energy as a function of pressure and enthalpy |

u_ps | p, s | u | Specific internal energy as a function of pressure and entropy |

Function | Parameters | Return | Description |

CpV_p | p | Cp | Saturated vapour heat capacity |

CpL_p | p | Cp | Saturated liquid heat capacity |

CpV_T | T | Cp | Saturated vapour heat capacity |

CpL_T | T | Cp | Saturated liquid heat capacity |

Cp_pT | p, T | Cp | Specific isobaric heat capacity as a function of pressure and temperature |

Cp_ph | p, h | Cp | Specific isobaric heat capacity as a function of pressure and enthalpy |

Cp_ps | p, s | Cp | Specific isobaric heat capacity as a function of pressure and entropy |

Function | Parameters | Return | Description |

CvV_p | p | Cv | Saturated vapour isochoric heat capacity |

CvL_p | p | Cv | Saturated liquid isochoric heat capacity |

CvV_T | T | Cv | Saturated vapour isochoric heat capacity |

CvL_T | T | Cv | Saturated liquid isochoric heat capacity |

Cv_pT | p, T | Cv | Specific isochoric heat capacity as a function of pressure and temperature |

Cv_ph | p, h | Cv | Specific isochoric heat capacity as a function of pressure and enthalpy |

Cv_ps | p, s | Cv | Specific isochoric heat capacity as a function of pressure and entropy |

Function | Parameters | Return | Description |

wV_p | p | w | Saturated vapour speed of sound |

wL_p | p | w | Saturated liquid speed of sound |

wV_T | T | w | Saturated vapour speed of sound |

wL_T | T | w | Saturated liquid speed of sound |

w_pT | p, T | w | Speed of sound as a function of pressure and temperature |

w_ph | p, h | w | Speed of sound as a function of pressure and enthalpy |

w_ps | p, s | w | Speed of sound as a function of pressure and entropy |

Function | Parameters | Return | Description |

my_pT | p, T | my | Viscosity as a function of pressure and temperature |

my_ph | p, h | my | Viscosity as a function of pressure and enthalpy |

my_ps | p, s | my | Viscosity as a function of pressure and entropy |

Function | Parameters | Return | Description |

Pr_pT | p, T | ||

Pr_ph | p, h |

Function | Parameters | Return | Description |

Kappa_pT | p, T | ||

Kappa_ph | p, h |

Function | Parameters | Return | Description |

st_t | T | st | Surface tension for two phase water/steam as a function of T |

st_p | p | st | Surface tension for two phase water/steam as a function of p |

Function | Parameters | Return | Description |

tcL_p | p | tc | Saturated vapour thermal conductivity |

tcV_p | p | tc | Saturated liquid thermal conductivity |

tcL_T | T | tc | Saturated vapour thermal conductivity |

tcV_T | T | tc | Saturated liquid thermal conductivity |

tc_pT | p, T | tc | Thermal conductivity as a function of pressure and temperature |

tc_ph | p, h | tc | Thermal conductivity as a function of pressure and enthalpy |

tc_hs | h, s | tc | Thermal conductivity as a function of enthalpy and entropy |

Function | Parameters | Return | Description |

x_ph | p, h | x | Vapour fraction as a function of pressure and enthalpy |

x_ps | p, s | x | Vapour fraction as a function of pressure and entropy |

Function | Parameters | Return | Description |

vx_ph | p, h | vx | Vapour volume fraction as a function of pressure and enthalpy |

vx_ps | p, s | vx | Vapour volume fraction as a function of pressure and entropy |