Boundary Conditions window
The
window Boundary Conditions enlists all spaces of which the user
sets temperatures and all power sources of which power density can be entered
(the boundary conditions).
Temperatures of spaces are initially preset to standard values:
- first space in the list (sorted alphabetically) is set to airspace temperature of -10°C
- all other spaces are set to the temperature of +20°C.
Remark: These standard values can be changed within application settings.
Spaces are enlisted alphabetically. Knowing this, by consequently naming spaces you can target proper automatic assignment of preset values.:
- Exterior precedes Interior
- Space 00 precedes Space 03 and Space 10
- Space 11 precedes Space 1.
If the component contains power sources (heat sources or sinks) also, their names will be offered here for the input of their respective power density [W/m3]. Initially power sources are set to have no power (equal 0 W/m3).
Remark:
If there is solution of vapour calculation available too, the input of relative
humidity of air space, required for vapour evaluations of partial pressure, is
also offered in additional dedicated column:
Relative humidity of air spaces is initially preset as follows:
- first space is assigned the relative air humidity of 80%
- all further spaces are assigned relative air humidity of 53%.
Remark: These standard values can be changed within
application
settings.
| Name | Name of the space or power source (not editable) |
| Value | The value of the boundary condition of specific space (temperature °C) or power source (power density W/m3). |
| Unit | Unit of the value of that specific boundary condition (not editable) |
| Rel. Humidity |
Relative
air humidity in percent |
| Part. Pressure |
Partial
pressure of vapour (in hPa) resulting from the temperature and relative
humidity values entered (not editable) |
| Expose graphical evaluation too | If checked here, the graphical evaluation (Results
3D window) will be started after boundary conditions are applied. If
this setting is turned off the graphical evaluation (if not open yet) will
not be executed automatically. See also Application settings. |
| Evaluate secondary functions | If checked here, secondary functions (like heat flux, relative
surface humidity, etc.) will be calculated for graphical evaluation. If
turned off (unchecked) only temperature field will be calculated
for
Results 3D evaluations.
This saves significantly time needed for calculation and reduces memory
demand during evaluation. See also Application settings |
| Apply | Confirms data entered in this window end initiates the superposition followed by various evaluations. |
You confirm the data entered by pressing the button Apply. Boundary conditions will be applied onto basic solutions (g-values). If calculation of basic solutions is also required it will be automatically initiated also.
Remark: The button "Apply" will blink if there is new
solution set available from the
solver, but the data entered in this window has not been applied yet to
the new solution set.
Remark: The button "Apply" is shown disabled if one or more basic
solutions have not been calculated (solved) yet, i.e. they are missing.
The temperature distribution with the construction results from the
superposition of respective basic solutions each multiplied by its boundary
condition. Results are presented as
text reports ready for
printing or to be saved as Adobe PDF, MS.Word
or MS-Excel files.
The distribution of temperature and further secondary functions is further
used in various graphical evaluations.
Boundary conditions entered are also saved to the project file when the project is saved.
Important: To retain the values of boundary conditions between program executions the project must be explicitly saved (project data is not saved automatically when boundary conditions are applied!).
Remark: You will need the value of power density W/m3 to properly enter the boundary condition specific to power sources. For verification purposes you will find the total volume of each power source within Modelling Report. Within Results Report and in the report "Probe point" in addition to the value of respective power densities you will also find the overall power of each power source.
| VAPOUR-option: Analysis of multidimensional vapour diffusion is only possible with an active VAPOUR-Option of the program.. |
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See also: Element Editor, Element types, Evaluations and Results, Standard Boundary Conditions