.AixLib.Media.Refrigerants.Validation.RefrigerantsDerivatives.RefrigerantsDerivativesR134a

Information

This example model checks the implementation of the refrigerant's partial derivatives. Therefore, the user has first to introduce some information about the refrigerant and afterwards the partial derivatives are calculated. The following refrigerant's information is required:

1. The refrigerant package that shall be tested.
2. The independent variables i.e. independents variables' alteration with time.

The following refrigerant's partial derivatives are calculated and checked:

1. Thermodynamic properties calculated by partial derivatives of the Helmholtz equation of state (e.g. specific heat capacity at constant pressure).
2. Partial derivatives that only depend on partial derivatives of the Helmholtz equation of state (i.e. derivatives wrt. density and temperature).
3. Partial derivatives that do not directly depend on partial derivatives of the Helmholtz equation of state (i.e. derivatives not wrt. density and temperature).
4. Partial derivatives at bubble and dew line.

Furthermore, the derivatives are compared with the associated derivatives calculated by an external medium model (i.e. HelmholtzMedia) Therefore, the parameters are not allowed to change (except for the medium package).

Contents

Name	Description
MediumInt	Internal medium model
TheStaExt	Record that contains thermodynamic state properties for external medium
States	Record that contains calculated states for further calculations
DerProp	Record that containts properties derived by partial derivatives of the EoS
ExplDer	Record that contains derivatives depending on derivatives of the EoS only
FurDer	Record that contains further derivatives
SatDer	Record that contains derivatives at bubble and dew state

Revisions

• August 13, 2017, by Mirko Engelpracht, Christian Vering:
  First implementation (see issue 408).