.AixLib.Media.Refrigerants.Interfaces.TemplateHybridTwoPhaseMediumFormula

Information

This package is a template for new refrigerant models using a hybrid approach based on the "Fast_Propane" model developed by Sangi et al. (for detailed information, please checkout AixLib.Media.Refrigerants.Interfaces.PartialHybridTwoPhaseMediumFormula ). For a new refrigerant model just make a copy of this package, remove the "partial" keyword from the package and provide the information that is requested in the comments of the Modelica code. The following information is requested:

1. Fluid constants: Provide basic information of the refrigerant and add the reference.
2. Basic information: Provide basic information like the refrigerant name and its valid fluid limits in terms of different thermodynamic state properties.
3. Base properties: Provide information about the refrigerant's base properties like the relation between specific enthalpy, specific internal energy, pressure and density.
4. Helmholtz EoS: Provide the formulas of the Helmholtz equation of state.
5. Saturation state properties: Provide the formulas of the saturation properties.
6. Further thermodynamic properties: Provide formulas for further thermodynamic properties like the thermal conductivity or surface tension.
7. Fitted state properties: Provide the formulas of ther further state properties.

A refrigerant package inherits from PartialHybridTwoPhaseMediumFormula and provides the equations for the refrigerant. Moreover, the PartialHybridTwoPhaseMedium package inherits from PartialMedium and, therefore, the details of this package are described in Modelica.Media.UsersGuide .

References

Sangi, Roozbeh; Jahangiri, Pooyan; Klasing, Freerk; Streblow, Rita; Müller, Dirk (2014): A Medium Model for the Refrigerant Propane for Fast and Accurate Dynamic Simulations. In: The 10th International Modelica Conference. Lund, Sweden, March 10-12, 2014: Linköping University Electronic Press (Linköping Electronic Conference Proceedings), S. 1271–1275

Contents

Name	Description
SmoothTransition	Record that contains ranges to calculate a smooth transition between different regions
f_Idg	Dimensionless Helmholtz energy (Ideal gas contribution f_Idg)
f_Res	Dimensionless Helmholtz energy (Residual part alpha_r)
t_fIdg_t	Short form for tau*(dalpha_0/dtau)_delta=const
tt_fIdg_tt	Short form for tau*tau*(ddalpha_0/(dtau*dtau))_delta=const
t_fRes_t	Short form for tau*(dalpha_r/dtau)_delta=const
tt_fRes_tt	Short form for tau*tau*(ddalpha_r/(dtau*dtau))_delta=const
d_fRes_d	Short form for delta*(dalpha_r/(ddelta))_tau=const
dd_fRes_dd	Short form for delta*delta(ddalpha_r/(ddelta*delta))_tau=const
td_fRes_td	Short form for tau*delta*(ddalpha_r/(dtau*ddelta))
ttt_fIdg_ttt	Short form for tau*tau*tau*(dddalpha_0/(dtau*dtau*dtau))_delta=const
ttt_fRes_ttt	Short form for tau*tau*tau*(dddalpha_r/(dtau*dtau*dtau))_delta=const
ddd_fRes_ddd	Short form for delta*delta*delta* (dddalpha_r/(ddelta*ddelta*ddelta))_tau=const
tdd_fRes_tdd	Short form for tau*delta*delta*(dddalpha_r/(dtau*ddelta*ddelta))
ttd_fRes_ttd	Short form for tau*tau*delta*(dddalpha_r/(dtau*dtau*ddelta))
saturationPressure	Saturation pressure of refrigerant (Ancillary equation)
saturationTemperature	Saturation temperature of refrigerant (Ancillary equation)
bubbleDensity	Boiling curve specific density of refrigerant (Ancillary equation)
dewDensity	Dew curve specific density of refrigerant (Ancillary equation)
bubbleEnthalpy	Boiling curve specific enthalpy of refrigerant (Ancillary equation)
dewEnthalpy	Dew curve specific enthalpy of refrigerant (Ancillary equation)
bubbleEntropy	Boiling curve specific entropy of refrigerant (Ancillary equation)
dewEntropy	Dew curve specific entropy of propane (Ancillary equation)
temperature_ph	Calculates temperature as function of pressure and specific enthalpy
temperature_ps	Calculates temperature as function of pressure and specific entroy
density_pT	Computes density as a function of pressure and temperature
dynamicViscosity	Calculates dynamic viscosity of refrigerant
thermalConductivity	Calculates thermal conductivity of refrigerant
surfaceTension	Surface tension in two phase region of refrigerant

Revisions

• June 6, 2017, by Mirko Engelpracht, Christian Vering:
  First implementation (see issue 408).