recorddata
constant IF97 data and region limits
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Information
Record description
Constants needed in the international steam properties IF97.
SCRIT and HCRIT are calculated from Helmholtz function for region 3.
Version Info and Revision history
First implemented: July, 2000
by Hubertus Tummescheit
Author: Hubertus Tummescheit,
Modelon AB
Ideon Science Park
SE-22370 Lund, Sweden
email: hubertus@modelon.se
Initial version: July 2000
Documentation added: December 2002
## Copyright © EDF 2002 - 2025
## ThermoSysPro Version 4.2Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Units.SI.SpecificHeatCapacity | RH2O | 461.526 | specific gas constant of water vapour |
| Units.SI.MolarMass | MH2O | 0.01801528 | molar weight of water |
| Units.SI.Temperature | TSTAR1 | 1386.0 | normalization temperature for region 1 IF97 |
| Units.SI.Pressure | PSTAR1 | 16.53e6 | normalization pressure for region 1 IF97 |
| Units.SI.Temperature | TSTAR2 | 540.0 | normalization temperature for region 2 IF97 |
| Units.SI.Pressure | PSTAR2 | 1.0e6 | normalization pressure for region 2 IF97 |
| Units.SI.Temperature | TSTAR5 | 1000.0 | normalization temperature for region 5 IF97 |
| Units.SI.Pressure | PSTAR5 | 1.0e6 | normalization pressure for region 5 IF97 |
| Units.SI.SpecificEnthalpy | HSTAR1 | 2.5e6 | normalization specific enthalpy for region 1 IF97 |
| Real | IPSTAR | 1.0e-6 | normalization pressure for inverse function in region 2 IF97 |
| Real | IHSTAR | 5.0e-7 | normalization specific enthalpy for inverse function in region 2 IF97 |
| Units.SI.Temperature | TLIMIT1 | 623.15 | temperature limit between regions 1 and 3 |
| Units.SI.Temperature | TLIMIT2 | 1073.15 | temperature limit between regions 2 and 5 |
| Units.SI.Temperature | TLIMIT5 | 2273.15 | upper temperature limit of 5 |
| Units.SI.Pressure | PLIMIT1 | 100.0e6 | upper pressure limit for regions 1, 2 and 3 |
| Units.SI.Pressure | PLIMIT4A | 16.5292e6 | pressure limit between regions 1 and 2, important for for two-phase (region 4) |
| Units.SI.Pressure | PLIMIT5 | 10.0e6 | upper limit of valid pressure in region 5 |
| Units.SI.Pressure | PCRIT | 22064000.0 | the critical pressure |
| Units.SI.Temperature | TCRIT | 647.096 | the critical temperature |
| Units.SI.Density | DCRIT | 322.0 | the critical density |
| Units.SI.SpecificEntropy | SCRIT | 4412.02148223476 | the calculated specific entropy at the critical point |
| Units.SI.SpecificEnthalpy | HCRIT | 2087546.84511715 | the calculated specific enthalpy at the critical point |
| Real | n | array(0.34805185628969e3, -0.11671859879975e1, 0.10192970039326e-2, 0.57254459862746e3, 0.13918839778870e2) | polynomial coefficients for boundary between regions 2 and 3 |