modelRadiationTemperature
Information
Hypothesis and equations
Simplified model calculating the mean temperature of the walls, for the connexion to the heat port of the heating floor and the distribution of the radiative fluxes.
Radiative temperature from RadiationTemperature model (Buildings) :
This model computes the radiative temperature in the room. For a room with windows but no shade, the radiative temperature is computed as :
Trad = ∑i (Ai εi Ti) ⁄ ∑i (Ai εi)
where Trad is the radiative temperature of the room, Ai are the surface areas of the room, εi are the infrared emissivities of the surfaces, and Ti are the surface temperatures.
Radiative fluxes distribution from InfraredRadiationGainDistribution model (Buildings) :
This model computes the distribution of the infrared radiant heat gain to the room surfaces. The infrared radiant heat gain Q is an input to this model. It is distributed to the individual surfaces according to :
Qi = Q Ai εi ⁄ ∑k Ak εk.
For opaque surfaces, the heat flow rate Qi is set to be equal to the heat flow rate at the heat port. For the glass of the windows, the heat flow rate Qi is set to the radiosity
Bibliography
RadiationTemperature and InfraredRadiationGainDistribution models (Buildings).
Instructions for use
none
Known limits / Use precautions
none
Validations
Validated model
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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Initial models : RadiationTemperature and InfraredRadiationGainDistribution, Michael Wetter, Buildings, Copyright © The Regents of the University of California, through Lawrence Berkeley National Laboratory.
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Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Opaque walls | |||
| Integer | np | 6 | Number of walles exposed to the radiative flux |
| Modelica.Units.SI.Area[np] | Sp | Vector of wall surfaces, respecting the order of connexions | |
| Modelica.Units.SI.Emissivity[np] | Ep | Vector of wall emissivities, respecting the order of connexions | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_b | ParoiEquivalente | ||
| Modelica.Fluid.Interfaces.HeatPorts_a[np] | AutresParois |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | SpEpTot | sum(Sp[i]*Ep[i] for i in 1:np) |