modelExtremeAmbientConditions
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This model validates the correct implementation of the heat transfer
to the collector when ambient temperatures are very low or irradiation is very
large.
It applies a ramp boundary condition that reduces the ambient temperature
to -60°C to verify that the collector fluid temperature does not
drop below Medium.T_min.
Afterwards, the solar irradiation is increased to overheat the collector.
If the fluid temperature approaches Medium.T_max,
then the solar heat gain is reduced to zero.
Ensuring these bounds is important as otherwise, the collector model
would trigger an assertion and the simulation would stop.
The tested collector models are
Buildings.Fluid.SolarCollectors.ASHRAE93
and
Buildings.Fluid.SolarCollectors.EN12975.
Note that the medium has been declared
as Buildings.Media.Water(T_min=273.15, T_max=273.15+100)
to set the two bounds for the water temperature.
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| BoundaryConditions.WeatherData.Bus | weaBus |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ASHRAE93 | solAsh | Flat plate solar collector model using the ASHRAE model | |
| EN12975 | solEn | Flat plate solar collector model using the EN 12975 model | |
| Sources.MassFlowSource_T | sou | Inlet boundary conditions | |
| Sources.Boundary_pT | sou1 | Inlet boundary conditions | |
| Modelica.Blocks.Sources.Ramp | TAmb | Ambient temperature | |
| Modelica.Blocks.Sources.Ramp | HSol | Solar irradiation | |
| Sources.MassFlowSource_T | sou2 | Inlet boundary conditions | |
| Modelica.Blocks.Sources.Constant | const | Constant that outputs zero | |
| Modelica.Blocks.Sources.Constant | solTim | Solar time | |
| Modelica.Blocks.Sources.Constant | lat | Location latitude | |
| Modelica.Blocks.Sources.Constant | alt | Location altitude | |
| Modelica.Blocks.Sources.Constant | const1 | Constant that outputs zero |
Contents
| Name | Description |
|---|---|
 Medium | Medium in the system |
Revisions
-
September 25, 2023, by Michael Wetter:
Correctedconnectstatement with wrong quantity. -
September 16, 2021, by Michael Wetter:
Removed parameter assignment forlat.
This is for IBPSA, #1477. -
June 30, 2015, by Michael Wetter:
First implementation.