Examples of analytic approximating functions

The following functions for the properties of saturated steam and water are approximately valid up to a 

The specific enthalpy of saturated steam (J/kg) is given over the same range of temperature and pressure by 

Average specific heat at constant pressure (J/(kgK)) may be approximated op to 4 MPa by the linear formulation  

TabI 16.2 Saturated steam approximating functions compared with steam tables 

The same form of equations may be used to model the steam conditions for the main turbine of a power station, where the pressure may be in the range 10 to 16 MPa. The greater spread of average specific heat at higher steam pressures may, however, require two or three values of specific heat to be used in equations (16.63) and (16.64) if the same level of accuracy is to be retained. 

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