[tag] WaterVapourEnthalpyIAPWSIF97Region4

The water vapour saturation enthalpy in region4 calculated is from pressure according to the IAPWSIF97Region4. Note: (1) The temperature unit is K, and pressure unit is Pa. (2) According to the IAPWS-IF97: http://www.iapws.org/relguide/IF97-Rev.pdf, the vapor-liquid saturation line in region4 only covers the pressure range between 611.213 Pa and 22.064 MPa. Thus, for the vapour saturation enthalpy calculated from the saturation temperature, it has the same pressure boundaries.

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