Learn about steam functions that have pressure as an input

Because pressure affects the state of steam, be aware of these considerations for functions that have pressure as an input.

Functions with pressure and temperature as inputs

Steam_HPT, Steam_SPT and Steam_VPT can be used for compressed water, superheated or saturated dry steam. For input temperature and pressure on the saturated curve, the calculated entropy, enthalpy or volume is a property of saturated vapor. These three functions can also accept high-range input temperatures (800 to 2000 °C) with pressures from 0.611212678 to 50000 kPa.

Steam_HPTL, Steam_SPTL and Steam_VPTL are used only for compressed water.

Functions with pressure and enthalpy or entropy as inputs

Steam_VPH, Steam_VPS, Steam_HPS, Steam_SPH, Steam_TPH and Steam_TPS can be used for compressed water, superheated or wet steam. For these functions, the range for enthalpy (H) is -0.04159 to 4160.7 J/g and for entropy (S) is -0.000155 to 11.921 J/(g K).

For Steam_XPH and Steam_XPS, input enthalpy or entropy greater than saturated vapor properties or less than saturated liquid properties returns an error.