StmEng_SPT

Calculates the vapor specific entropy as a function of pressure and temperature—all variables expressed in English units. Only use for superheated or dry saturated steam. An error of -1 (or input out of range digital state) is returned for input temperature lower 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

StmEng_SPT(P, T)

Arguments

• P

  Pressure of the steam in psia. The valid range is 0.08865 to 14503.77 psia for temperatures up to 1472 °F and 0.08865 to 7251.8869 psia for temperatures up to 3632 °F.

• T

  Steam temperature in °F. The valid range is 32 to 3632 °F.

Returns

Computed vapor specific entropy in BTU/lbm/R or- Error digital state.

Sample Values