First; existing libraries are tested and in some cases modified to increase the stability. Since the simulation speeds were not in an acceptable range in the existing models; a new propane model is introduced. The new model is then tested as a refrigerant in a direct exchange heat pump system. A comparison between an existing propane model and the new model shows that much faster simulations; up to 35 times; are possible with the new propane model.
Keywords: Media Library; Propane; Refrigerant; Helmholtz Media
Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden
[1] C. Heinrich, K. Berthold “A Modelica Library for Simulation of Household Refrigeration Appliances Features and Experiences”. In: Proceedings of the 5th International Modelica Conference, 2006, pp. 677-684.
[2] T. Pfafferott, G. Schmitz “Modeling and Simulation of Refrigeration Systems with the Natural Refrigerant CO2” In: Proceesings of the International Refrigeration and Air Conditioning Conference, 2002.
[3] T. Pfafferott, G. Schmitz “ Implementation of a Modelica Library for Simulation of Refrigeration Systems” In: Proceedings of the 3rd International Modelica Conference, 2003, pp. 197-206.
[4] I. Bell, S. Quoilin, J. Wronski, V. Lemort “CoolProp: An Open-Source Reference-Quality Thermophysical Property Library” In: 2nd ASME ORC International eminar, 2013.
[5] M. Thorade, A. Saadat “Partial Derivatives of Thermodynamic State Properties for Dynamic Simulation”. In: Environmental Earth Sciences (online first), 2012. DOI:
10.1007/s12665-013-2394-z.
[6] M. Thorade, A. Saadat “HelmholtzMedia – A Fluid Properties Library”. In: Proceedings of the 9th International Modelica Conference, 2012, pp. 63-69. DOI: 10.3384/ecp1207663
[7] E. W. Lemmon, M. O. McLinden, W. Wagner “Thermodynamic Properties of Propane. III. A Reference Equation of State for Temperature from Melting Line to 650 K and Pressures up tp 1000 MPa”. In: Journal of Chemical Engineering Data 54, 2009, pp. 3141-3180.
[8] K. Lucas, “Thermodynamik, Die Grundgesetze der Energie- und Stoffumwandlungen”, Sprinter Verlag Berlin, 7. Edition, 2008. ISBN-13: 9783540686453