modelGroundTemperature0D
Information
The model bases on the Kusuda equations, which describes the temperature on the ground as a function of the depth z and time.
To determine the temperature it is necessary to have information about the weather: mean annual temperature (Tmean) and annual temperature amplitude (A) as well as information about the ground thermal diffusivity alpha. Furthermore the equation is tunned with a time shift parameter t0 which correponds to the day at which the ambient temperature has its maximum value.
References
Soil thermal conductivity prediction for distrit heating pre-insulated pipeline in operation; Matjaz P., Zlatko R., Suvad B. and Iztok Z.; published in Energy 2012
Earth temperature and thermal diffusivity at selected stations in the United States; Kusuda, T. and Achenbach P. R., 1965
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Temperature | Tmean | Mean annual temperature | |
| Modelica.Units.SI.TemperatureDifference | A | Annual temperature amplitude | |
| Modelica.Units.SI.Length | z | Depth | |
| Modelica.Units.SI.Time | t0 | Time shift | |
| Modelica.Units.SI.ThermalDiffusivity | alpha | 8.2e-7 | Ground thermal diffusivity |
| Boolean | use_geo | false | Set to true to use geothermal grade, false geo = 0 |
| Real | geo | 0.03 | Geothermal grade |
| Integer | m | 3 | Number of collected heat flows |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| BuildingSystems.Interfaces.HeatPorts[m] | port | ||
| Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature | prescribedTemperature | ||
| Modelica.Thermal.HeatTransfer.Components.ThermalCollector | thermalCollector |