functionnusseltHorizontalCavityReduced
Nusselt number for horizontal cavity, bottom surface colder than top surface
Extends from Modelica.Icons.Function (Icon for functions).
Information
Function for Nusselt number in horizontal window cavity. The computation is according to TARCOG 2006, except that this implementation computes the Nusselt number 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.Area | h | 1.5 | Height of window |
| Real | sinTil | Sine of window tilt | |
| 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 |
Revisions
-
December 9, 2010, by Michael Wetter:
First implementation.