modelWindConvection
Extends from BuildSysPro.BaseClasses.HeatTransfer.Interfaces.Element1D (Partial heat transfer element with two HeatPort connectors that does not store energy).
Information
Hypothesis and equations
Model to calculate the convective heat exchange coefficient on the outside, depending on the wind speed and direction, for an horizontal or vertical wall.
Correlation comes from notice TF112 of CLIM2000, for these two specific cases :
- Windward façade (when wind is directed to the façade)
- Leeward façade (when wind is directed to another direction)
An horizontal wall will be automatically considered as a leeward façade.
Bibliography
See notice TF112 from CLIM2000.
Instructions for use
none
Known limits / Use precautions
The model could be improved adding different correlations (roughness of the surface, tilt, wind direction...).
Validations
Validated model - Aurélie Kaemmerlen 2013
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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Aurélie KAEMMERLEN, EDF (2013)
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Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | VitesseVent | false | Taking into account wind speed in the calculation of the outside convective heat exchange coefficient |
| Boolean | GLOext | false | Taking into account infrared radiation between the wall and the sky |
| Modelica.Units.SI.CoefficientOfHeatTransfer | hs_ext | 25 | Convective surface heat exchange coefficient on the outside - depending on the settings (GLOext and VitesseVent), hs_ext can be purely convective or purely radiative |
| Modelica.Units.SI.Area | S | Exchange surface | |
| Modelica.Units.NonSI.Angle_deg | azimut | Azimut of the surface (relative to the south) - S=0°, E=-90°, W=90°, N=180° | |
| Modelica.Units.NonSI.Angle_deg | incl | 90 | Tilt of the surface relative to the horizontal - toward the ground=180°, toward the sky=0°, vertical=90° |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| HeatPort_a | port_a (from Element1D) | ||
| HeatPort_b | port_b (from Element1D) | ||
| Modelica.Blocks.Interfaces.RealInput[2] | V | Wind speed [m/s] and direction (0° - North, 90° - East, 180° - South, 270° - West) |
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.CoefficientOfHeatTransfer | h_vent | Convective heat exchange coefficient on the outside |
Contents
| Name | Description |
|---|---|
| correlation |