modelFrostDensityKorn
Frost density model according to Korn et al.
Information
Default values are based on Korn et al. Other values are e.g. according to Hermes: k=4.7465, T=7930.098.
References
Dieter Korn. Effizienter Betrieb von Kälteanlagen: Energieeinsparung, Wärmerückgewinnung, Abwärmenutzung. VDE VERLAG GMBH, Berlin Offenbach, 2014. ISBN 978-3-8007-3853-3.
Hermes, Christian J. L. ; Piucco, Robson O. ; Barbosa, Jader R. ; Melo, Cláudio: A study of frost growth and densification on flat surfaces. In: Experimental Thermal and Fluid Science 33 (2009), Januar, Nr. 2, 371–379. https://dx.doi.org/10.1016/j.expthermflusci.2008.10.006.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | k | 3.77 | Gain |
| Modelica.Units.SI.Time | T | 8000 | Time Constant |
| Real | den_min | 50 | Minimal density |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealOutput | froDen | Frost density | |
| Modelica.Blocks.Interfaces.BooleanInput | hea | Heating mode | |
| Modelica.Blocks.Interfaces.RealInput | groRat | Indicator if frosting is taking place; growth rate > 0 |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | y_internal | Internal first order output | |
| Real | u_internal | Internal first order input, indicator whether frost density is rising | |
| Modelica.Blocks.Sources.RealExpression | froDen_internal | Internal frost density calculation |
Revisions
-
December 22, 2025 by Fabian Roemer:
First implementation (see issue AixLib #1623)