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Constant IF97 data and region limits
Extends from Modelica.Icons.Record (Icon for records).
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
Modelon AB
Ideon Science Park
SE-22370 Lund, Sweden
- Initial version: July 2000
- Documentation added: December 2002
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.SpecificHeatCapacity | RH2O | 461.526 | Specific gas constant of water vapour |
| SI.MolarMass | MH2O | 0.01801528 | Molar weight of water |
| SI.Temperature | TSTAR1 | 1386.0 | Normalization temperature for region 1 IF97 |
| SI.Pressure | PSTAR1 | 16.53e6 | Normalization pressure for region 1 IF97 |
| SI.Temperature | TSTAR2 | 540.0 | Normalization temperature for region 2 IF97 |
| SI.Pressure | PSTAR2 | 1.0e6 | Normalization pressure for region 2 IF97 |
| SI.Temperature | TSTAR5 | 1000.0 | Normalization temperature for region 5 IF97 |
| SI.Pressure | PSTAR5 | 1.0e6 | Normalization pressure for region 5 IF97 |
| 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 |
| SI.Temperature | TLIMIT1 | 623.15 | Temperature limit between regions 1 and 3 |
| SI.Temperature | TLIMIT2 | 1073.15 | Temperature limit between regions 2 and 5 |
| SI.Temperature | TLIMIT5 | 2273.15 | Upper temperature limit of 5 |
| SI.Pressure | PLIMIT1 | 100.0e6 | Upper pressure limit for regions 1, 2 and 3 |
| SI.Pressure | PLIMIT4A | 16.5292e6 | Pressure limit between regions 1 and 2, important for two-phase (region 4) |
| SI.Pressure | PLIMIT5 | 10.0e6 | Upper limit of valid pressure in region 5 |
| SI.Pressure | PCRIT | 22064000.0 | The critical pressure |
| SI.Temperature | TCRIT | 647.096 | The critical temperature |
| SI.Density | DCRIT | 322.0 | The critical density |
| SI.SpecificEntropy | SCRIT | 4412.02148223476 | The calculated specific entropy at the critical point |
| 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 |