Steam

Steam calculates the thermodynamic properties of water and steam for subcooled (compressed liquid), saturated, superheated, and supercritical conditions.

Use Steam in the field and in the classroom to replace tedious interpolation of steam properties from printed steam tables.

Steam includes both the 1997 and 1967 industrial formulations for property calculations. Although the 1997 formulation has been available for over 10 years, most heat balances and textbooks still use the 1967 formulation.

Select one of the functions:

P,T - pressure and temperature
P,h - pressure and specific enthalpy
P,s - pressure and specific entropy
P,x - pressure and steam quality
T,x - temperature and steam quality

to calculate:

Specific enthalpy
Specific entropy
Specific volume
Specific heat capacity (isobaric)
Specific internal energy
Density
Saturation temperature
Quality
Saturated liquid and saturated vapor properties

Switch instantly between imperial (psia, F, Btu/lbm, etc.) or metric (kPa, C, kJ/kg, etc.) engineering units. You choose the metric units for pressure (kilopascal, megapascal, bar, atmospheres, millimeters of mercury, or kiloponds/cm2), temperature (C or K), energy (kilojoules, kilocalories, or kilopond-meters) and specific volume (cubic meters/kg or liters/kg). Tap the 'i' button to access the metric units setup screen.

For saturated and two-phase conditions, saturated liquid and saturated vapor values are calculated. If appropriate for a particular property, the delta from liquid to vapor is also calculated. For example, the heat of vaporization (hfg) is calculated for specific enthalpy.

Select either the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam (IF97) or the 1967 IFC-Formulation for Industrial Use (IFC-67).

更新履歴
Version 1.0.3
- Fixed problem with some numbers being displayed as phone number links on iPhones

Version 1.0.2
- Fixed conversion factor for internal energy calculation in 1967 steam tables
- Fixed incorrect calculation in 1967 steam tables when pressure and temperature inputs were identical

Version 1.0.1
- Fixed 'out of range' error for pressure and temperature inputs near the saturation line