State struct

[longemen3000]

with #268 , the need for State struct seems to arise. this discussion is to discuss the details of a State struct for Clapeyron.

• What is a State struct? : it is a struct that contains a set of thermodynamic properties that constitute a complete state. For example: T = 300K, p = 1 atm, z = [0.5,0.5] is a complete state for a 2-component model. there are also states that depend on the phase (liquid, gas, solid) or equilibria conditions (at saturation, critical point)
• what interface do we want for the State constructor?
• how do we calculate properties with the State constructor?
• compatibility

[longemen3000]

Coolprop supports the following:

Input Pair	Description
QT_INPUTS	Molar quality, Temperature in K
QSmolar_INPUTS	Molar quality, Entropy in J/mol/K
QSmass_INPUTS	Molar quality, Entropy in J/kg/K
HmolarQ_INPUTS	Enthalpy in J/mol, Molar quality
HmassQ_INPUTS	Enthalpy in J/kg, Molar quality
DmassQ_INPUTS	Molar density kg/m^3, Molar quality
DmolarQ_INPUTS	Molar density in mol/m^3, Molar quality
PQ_INPUTS	Pressure in Pa, Molar quality
PT_INPUTS	Pressure in Pa, Temperature in K
DmassT_INPUTS	Mass density in kg/m^3, Temperature in K
DmolarT_INPUTS	Molar density in mol/m^3, Temperature in K
HmassT_INPUTS	Enthalpy in J/kg, Temperature in K
HmolarT_INPUTS	Enthalpy in J/mol, Temperature in K
SmassT_INPUTS	Entropy in J/kg/K, Temperature in K
SmolarT_INPUTS	Entropy in J/mol/K, Temperature in K
TUmass_INPUTS	Temperature in K, Internal energy in J/kg
TUmolar_INPUTS	Temperature in K, Internal energy in J/mol
DmassP_INPUTS	Mass density in kg/m^3, Pressure in Pa
DmolarP_INPUTS	Molar density in mol/m^3, Pressure in Pa
HmassP_INPUTS	Enthalpy in J/kg, Pressure in Pa
HmolarP_INPUTS	Enthalpy in J/mol, Pressure in Pa
PSmass_INPUTS	Pressure in Pa, Entropy in J/kg/K
PSmolar_INPUTS	Pressure in Pa, Entropy in J/mol/K
PUmass_INPUTS	Pressure in Pa, Internal energy in J/kg
PUmolar_INPUTS	Pressure in Pa, Internal energy in J/mol
DmassHmass_INPUTS	Mass density in kg/m^3, Enthalpy in J/kg
DmolarHmolar_INPUTS	Molar density in mol/m^3, Enthalpy in J/mol
DmassSmass_INPUTS	Mass density in kg/m^3, Entropy in J/kg/K
DmolarSmolar_INPUTS	Molar density in mol/m^3, Entropy in J/mol/K
DmassUmass_INPUTS	Mass density in kg/m^3, Internal energy in J/kg
DmolarUmolar_INPUTS	Molar density in mol/m^3, Internal energy in J/mol
HmassSmass_INPUTS	Enthalpy in J/kg, Entropy in J/kg/K
HmolarSmolar_INPUTS	Enthalpy in J/mol, Entropy in J/mol/K
SmassUmass_INPUTS	Entropy in J/kg/K, Internal energy in J/kg
SmolarUmolar_INPUTS	Entropy in J/mol/K, Internal energy in J/mol

[pw0908]

I see. That should work then?

Apart from that, would we now need a VT-solver?

[pw0908]

Oh! We could also include caches at this point!

[longemen3000]

Yeah, that is an option too

[pw0908]

So do we want to figure out this State framework before the next release?

[longemen3000]

I'm interested. At the moment I'm finishing the COSMO updates, after that I can work up on that