functionconvectionHorizontalCavity
Free convection in horizontal cavity
Extends from Modelica.Icons.Function (Icon for functions).
Information
Function for convective heat transfer in horizontal window cavity. The computation is according to TARCOG 2006, except that this implementation computes the convection coefficient as a function that is differentiable in the temperatures.
References
TARCOG 2006: Carli, Inc., TARCOG: Mathematical models for calculation of thermal performance of glazing systems with our without shading devices, Technical Report, Oct. 17, 2006.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.HeatTransfer.Data.Gases.Generic | gas | Thermophysical properties of gas fill | |
| Real | Ra | Rayleigh number | |
| Modelica.Units.SI.Temperature | T_m | Temperature used for thermophysical properties | |
| Modelica.Units.SI.TemperatureDifference | dT | Temperature difference used to compute q_flow = h*dT | |
| Modelica.Units.SI.Angle | til | Window tilt | |
| Real | sinTil | Sine of window tilt | |
| Real | cosTil | Cosine of the window tilt | |
| Modelica.Units.SI.Area | h | 1.5 | Height of window |
| Real | deltaNu | 0.1 | Small value for Nusselt number, used for smoothing |
| Real | deltaRa | 1E3 | Small value for Rayleigh number, used for smoothing |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | Nu | Nusselt number | |
| Modelica.Units.SI.CoefficientOfHeatTransfer | hCon | Convective heat transfer coefficient | |
| Modelica.Units.SI.HeatFlux | q_flow | Convective heat flux |
Revisions
-
December 9, 2010, by Michael Wetter:
First implementation.