Hi all

I need some help here. i need to manually calculate the thermodynamic properties of few refrigerants such as R134A etc. I am pretty much unsure of what equations i should use.
There are few thermodynamic properties table online ( such as NIST ) but my lecturer does not allow me to refer to.

I have previously used EES ( engineering equation solver ) to obtain the properties. but again my lecturer does not agree to it.

I need these these thermodynamic properties such as specific enthalpy and entropy to design thermodynamic cycle , Organic Rankine cycle.

The thermodynamic properties table by NIST however shows the principal equation to calculate the pressure. But I do not know how to derive the equation in order to calculate the entropy and enthalpy.


It would be very great if someone can share anything on those equations. Thanks