functiondDewEntropy_dPressure
Derivative of vapor specific entropy in two-phase region w.r.t pressure | use setState_phX function for input
Extends from Modelica.Icons.Function.
Information
This function calculates the derivative of vapor entropy of R1234yf with regard to the state variable p (absolute pressure). The non-derivative function is dewEntropy.
Restrictions
It is only valid in the two-phase region (i.e., ptriple ≤ p ≤ pcrit ).
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| SaturationProperties | sat | saturation properties | pressure is used for interpolation | |
| SaturationProperties | der_sat | derivative of saturation properties |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | dsvdp | derivative of vapor specific entropy in two-phase region w.r.t pressure |