modelConvection_Condensation
Upward or downward heat exchange by free convection from an horizontal or inclined surface.
Mass transfer by condensation from the air (filled port) to the cover/screen (empty port).
If studying heat exchange of Air-Floor: connect the filled port to the floor and the unfilled port to the air.
Extends from Greenhouses.Interfaces.HeatAndVapour.Element1D (Partial water mass transfer element with two WaterMassPort connectors that does not store energy).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Angle | phi | inclination of the surface (0 if horizontal, 25 for typical cover) | |
| Modelica.Units.SI.Area | A | floor surface | |
| Boolean | floor | false | true if floor, false if cover or thermal screen heat flux |
| Boolean | thermalScreen | false | presence of a thermal screen in the greenhouse |
| Boolean | Air_Cov | true | True if heat exchange air-cover, False if heat exchange air-screen |
| Boolean | topAir | false | False if MainAir-Cov; True for: TopAir-Cov |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | HeatPort_a (from Element1D) | ||
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b | HeatPort_b (from Element1D) | ||
| Greenhouses.Interfaces.Vapour.WaterMassPort_a | MassPort_a (from Element1D) | ||
| Greenhouses.Interfaces.Vapour.WaterMassPort_b | MassPort_b (from Element1D) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.HeatFlowRate | Q_flow (from Element1D) | Heat flow rate from port_a -> port_b | |
| Modelica.Units.SI.TemperatureDifference | dT (from Element1D) | port_a.T - port_b.T | |
| Modelica.Units.SI.MassFlowRate | MV_flow (from Element1D) | Mass flow rate from port_a -> port_b | |
| Modelica.Units.SI.PressureDifference | dP (from Element1D) | port_a.VP - port_b.VP | |
| Real | SC | 0 | Screen closure 1:closed, 0:open |
| Modelica.Units.SI.CoefficientOfHeatTransfer | HEC_ab | ||
| Real | VEC_ab | Mass transfer coefficient | |
| Real | s | 11 | Slope of the differentiable switch function for vapour pressure differences |
| Modelica.Units.SI.CoefficientOfHeatTransfer | HEC_up_flr | ||
| Modelica.Units.SI.CoefficientOfHeatTransfer | HEC_down_flr |