This package provides a refrigerant model for R134a using a hybrid approach developed by Sangi et al.. The hybrid approach is implemented in AixLib.Media.Refrigerants.Interfaces.PartialHybridTwoPhaseMediumRecord and the refrigerant model is implemented by complete the template AixLib.Media.Refrigerants.Interfaces.TemplateHybridTwoPhaseMediumRecord . The fitting coefficients required in the template are saved in the package AixLib.DataBase.Media.Refrigerants.R134a.
The implemented coefficients are fitted to external data by
Engelpracht and are valid within the following range:
|
Parameter |
Minimum Value |
Maximum Value |
|
Pressure (p) in bar |
1 |
39.5 |
|
Temperature (T) in K |
233.15 |
370.15 |
The reference point is defined as 200 kJ/kg and 1 kJ/kg/K, respectively, for enthalpy and entropy for the saturated liquid at 273.15 K.
The model is validated by comparing results obtained from the example model AixLib.Media.Refrigerants.Examples.RefrigerantProperties to external data (e.g. obtained from measurements or external media libraries).
Tillner-Roth, R.; Baehr, H. D. (1994): An International Standard Formulation for the thermodynamic Properties of 1,1,1,2|Tetrafluoroethane (HFC|134a) for Temperatures from 170 K to 455 K and Pressures up to 70 MPa. In: Journal of physical and chemical reference data (23), S. 657–729. DOI: 10.1063/1.555958 .
Huber, Marcia L.; Laesecke, Arno; Perkins, Richard A. (2003): Model for the Viscosity and Thermal Conductivity of Refrigerants, Including a New Correlation for the Viscosity of R134a. In: Ind. Eng. Chem. Res. 42 (13) , S. 3163–3178. DOI: 10.1021/ie0300880 .
Perkins, R. A.; Laesecke, A.; Howley, J.; Ramires, M. L. V.; Gurova, A. N.; Cusco, L. (2000): Experimental thermal conductivity values for the IUPAC round-robin sample of 1,1,1,2-tetrafluoroethane (R134a). Gaithersburg, MD: National Institute of Standards and Technology.
Mulero, A.; Cachadiña, I.; Parra, M. I. (2012): Recommended Correlations for the Surface Tension of Common Fluids. In: Journal of physical and chemical reference data 41 (4), S. 43105. DOI: 10.1063/1.4768782 .
Engelpracht, Mirko (2017): Development of modular and scalable simulation models for heat pumps and chillers considering various refrigerants. Master Thesis
| Name | Description |
|---|---|
| EoS | Record that contains fitting coefficients of the Helmholtz EoS |
| BDSP | Record that contains fitting coefficients of the state properties at bubble and dew lines |
| TSP | Record that contains fitting coefficients of the state properties calculated with two independent state properties |
| SmoothTransition | Record that contains ranges to calculate a smooth transition between different regions |
| dynamicViscosity | Calculates dynamic viscosity of refrigerant |
| thermalConductivity | Calculates thermal conductivity of refrigerant |
| surfaceTension | Surface tension in two phase region of refrigerant |