SteamTables

A Julia implementation of the IAPWS-IF97 properties of water and steam. Provides the Gibbs and Helmholtz free energies, enthalpy, entropy, Cp, Cv and sonic velocity.

Optional use of physical units via Unitful.jl

Inputs are either P&T, P&h or P&s.

Exported functions

Single input

Name	Units	Properties returned
Psat(T)	MPa	Saturation pressure
Tsat(P)	K	Saturation temperature
SatDensL(T)	kg/m3	Saturated liquid density
SatDensV(T)	kg/m3	Saturated vapour density
SatHL(T)	J/kg	Saturated liquid enthalpy
SatHV(T)	J/kg	Saturated vapour enthalpy
SatSL(T)	J/kgK	Saturated liquid entropy
SatSV(T)	J/kgK	Saturated vapour entropy
DeltaHvap	J/kg	Latent heat of vaporisation

Two inputs

P and T

SpecificG, SpecificF, SpecificV, SpecificU, SpecificS, SpecificH, SpecificCP, SpecificCV, SpeedOfSound

P and h

SpecificG_Ph, SpecificF_Ph, SpecificV_Ph, SpecificU_Ph, SpecificS_Ph, SpecificH_Ph, SpecificCP_Ph, SpecificCV_Ph, SpeedOfSound_Ph, Quality_Ph, Temperature_Ph

P and s

SpecificG_Ps, SpecificF_Ps, SpecificV_Ps, SpecificU_Ps, SpecificS_Ps, SpecificH_Ps, SpecificCP_Ps, SpecificCV_Ps, SpeedOfSound_Ps, Quality_Ps, Temperature_Ps

T and h

Quality_Th

T and s

Quality_Ts

Name	Units	Properties returned
SpecificG	kJ/kg	Specific Gibbs free energy
SpecificF	kJ/kg	Specific Helmholtz free energy
SpecificV	m3/kg	Specific volume
SpecificU	kJ/kg	Specific internal energy
SpecificS	kJ/kgK	Specific entropy
SpecificH	kJ/kg	Specific enthalpy
SpecificCp	kJ/kgK	Specific isobaric heat capacity
SpecificCv	kJ/kgK	Specific isochoric heat capacity
SpeedOfSound	m/s	Sonic velocity
Quality		Vapour quality

Temperatures in K, Pressures in MPa

Exported constants

Name	Value	Units	Physical Constant
R	0.461526	kJ/kg/K	Universal gas constant
Tc	647.096	K	Critical temperature of water
Pc	22.064	kg/m3	Critical density of water
T3	273.16	K	Triple point temperature of water
P3	611.657E-6	MPa	Triple point pressure of water
Mr	18.01528	kg/kmol	Molecular weight of water

Use of physical units

If unitless values are passed, the physical units listed above are assumed and the returned values will also be in these units, e.g. Kelvin for temperature, MPa for pressure.

Optionally, however, you may pass Unitful.jl Quantity values, e.g. 100u"°C". The returned values will still be in the specified units, but may be easily converted via Unitful's uconvert()

Example

julia> using SteamTables, Unitful

julia> Psat(400)
0.24575318630408327

julia> Psat(400u"K")
0.24575318630408327 MPa

julia> Psat(300u"°C")
8.587708329557278 MPa

julia> uconvert(u"psi", Psat(400u"K"))
35.643486181534875 psi

For more details on the use of Unitful, see the package documentation.