WOLFRAM SYSTEM MODELER
    T3a_phRegion 3 a: inverse function T(p,h)  | 
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SystemModel["Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.T3a_ph"]

This information is part of the Modelica Standard Library maintained by the Modelica Association.
Equation number 2 from:
| p | 
         Type: Pressure (Pa) Description: Pressure  | 
    
|---|---|
| h | 
         Type: SpecificEnthalpy (J/kg) Description: Specific enthalpy  | 
    
| T | 
         Type: Temperature (K) Description: Temperature  | 
    
|---|