modelZoneLwDistributionViewFactor
Internal longwave radiative heat exchange using view factors
Information
Computation of longwave radiative heat exchange based on view factors.
Assumption and limitations
This implementation is only valid for rectangular geometries.
Verification
Verification test in IDEAS.Buildings.Validation.Tests.ViewFactorVerification.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | nSurf | number of surfaces in contact with the zone | |
| Modelica.Units.SI.Angle | incCeiling | IDEAS.Types.Tilt.Ceiling | |
| Modelica.Units.SI.Angle | incFloor | IDEAS.Types.Tilt.Floor | |
| Modelica.Units.SI.Angle | incWall | IDEAS.Types.Tilt.Wall | |
| Modelica.Units.SI.Angle | aziSouth | IDEAS.Types.Azimuth.S | |
| Integer | numAzi | 4 | |
| Modelica.Units.SI.Length | hZone | Distance between floor and ceiling | |
| Boolean | linearise | true | Linearise radiative heat exchange |
| Real | Umat | ||
| Linearisation | |||
| Modelica.Units.SI.Temperature | Tzone_nom | 295.15 | Nominal temperature of environment, used for linearisation |
| Modelica.Units.SI.TemperatureDifference | dT_nom | -2 | Nominal temperature difference between solid and air, used for linearisation |
| Advanced | |||
| Real | vieFac | Emissivity weighted viewfactor from surface to surface | |
| Real | vieFacTot | Emissivity weighted viewfactor from total of surfaces to each other | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | inc | Surface inclination angles | |
| Modelica.Blocks.Interfaces.RealInput | azi | Surface azimuth angles | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_a | ||
| Modelica.Blocks.Interfaces.RealInput | A | surface areas | |
| Modelica.Blocks.Interfaces.RealInput | epsLw | longwave surface emissivities | |
| Modelica.Blocks.Interfaces.RealOutput | floorArea | Amount of floor area for each surface |
Revisions
-
December 8, 2016 by Filip Jorissen:
Fixed indexing bug in algorithm.