modelOptimalDefrostWangEtAl
Optimal defrost time according to Wang et al.
Information
Helper model to implement the optimal defrost icing factor by Wang et al.References
Wang, W., Zhang, S., Li, Z., Sun, Y., Deng, S., and Wu, X. (2020). Determination of the optimal defrosting initiating time point for an ASHP unit based on the minimum loss coefficient in the nominal output heating energy. Energy, 191, 116505. https://doi.org/10.1016/j.energy.2019.116505.
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | TOda | Outdoor air temperature | |
| Modelica.Blocks.Interfaces.RealInput | relHum | Input relative humidity of outdoor air | |
| Modelica.Blocks.Interfaces.RealOutput | minIceFac | Minimal allowed icing Factor to trigger the defrost |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | epsNL | -0.311*TOdaDegC.y - 0.043*TOdaDegC.y^2 - 0.005*TOdaDegC.y^3 + (0.783 - 1.072*10^(-4)*TOdaDegC.y^3)*relHumInPer.y^0.846 + 2.647 | Icing Factor triggering defrost Wang |
| Modelica.Blocks.Math.UnitConversions.To_degC | TOdaDegC | Outdoor air temperatur in degC | |
| Modelica.Blocks.Math.Gain | relHumInPer | Relative humidity in percent | |
| Modelica.Blocks.Sources.RealExpression | minIceFac_internal | Relative humidity in percent |
Revisions
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December 22, 2025 by Fabian Roemer:
First implementation (see issue AixLib #1623)