StmSI_SPX
- Last UpdatedSep 17, 2025
- 1 minute read
- PI System
- PI Server 2023
- PI Server
Calculates the steam specific entropy as a function of pressure and quality (vapor fraction)— all variables expressed in SI units. Use only for wet steam.
Format
StmSI_SPX(P, X)
Arguments
-
P
Pressure of the steam in KPa. The valid range is 0.611213 to 22064 KPa..
-
X
Steam quality (vapor fraction). Valid range is from 0.0 to 1.0.
Returns
Computed specific entropy of the steam in J/g/K or Error digital state.
Sample Values
|
Pressure |
Steam Quality |
Entropy |
|
2500. |
0.9 |
5.8858 |
|
5000. |
0.9 |
5.6684 |
|
10000. |
0.9 |
5.3903 |