functionfres_R134a
Calculation of helmholtz derivatives
Extends from Modelica.Icons.Function.
Information
This function computes the residual helmholtz derivatives of the fundamental equation of Tillner-Roth and Baehr for R134a (1994) w.r.t. to reduced temperature (tau=T_crit/T) and reduced density (delta=rho/rho_crit). The function can be used for special properties depending just on the residual derivative parts.Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | delta | Reduced density (delta=d/dcrit) | |
| Real | tau | Reduced temperature (tau=Tcrit/T) |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| ThermofluidStream.Media.myMedia.Common.HelmholtzDerivs | f | Helmholtz derivatives |