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PI System Management Tools

StmSI_SPTL

  • Last UpdatedSep 17, 2025
  • 1 minute read

Calculates the liquid specific entropy as a function of pressure and temperature—all variables expressed in SI units. Only use for compressed water. An error of -1 (or input out of range digital state) is returned for input temperature higher than the saturation temperature for the input pressure. However, the function computes for the full range of temperature for input pressure greater than the critical pressure.

Format

StmSI_SPTL(P, T)

Arguments

  • P

    Pressure of the water in kpa. The valid range is 0.6108 to 110316.0 kpa.

  • T

    Water temperature in degree C. The valid range is 0.0 to 871.11 degree C.

Returns

Computed liquid specific entropy in J/g/K or Error digital state.

Sample Values

Pressure

Temperature

Entropy

2500.

100.

1.305

5000.

100.

1.3032

10000.

100.

1.29936

40000.

100.

1.27732

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