dDewEnthalpy_dPressure

Derivative of vapor specific enthalpy in two-phase region w.r.t pressure

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This function calculates the derivative of vapor enthalpy of R134a in the two-phase region with regard to the state variable p (absolute pressure). The non-derivative function is dewEnthalpy.

Restrictions

It is only valid in the two-phase region (i.e., ptriple ≤ p ≤ pcrit ).

Syntax

dhvdp = dDewEnthalpy_dPressure(sat)

Inputs (1)

sat

Type: SaturationProperties

Description: Saturation property record

Outputs (1)

dhvdp

Type: DerEnthalpyByPressure (J·m·s²/kg²)

Description: Saturated steam specific enthalpy derivative