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Assigning Boundary Conditions |
  
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Assigning Boundary Conditions |
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When assigning boundary conditions, you are defining the start point for the boundary condition (cf. Tutorial 1). The boundary condition is valid from this point to the next boundary condition, which runs counterclockwise (boundary conditions run clockwise for interior cavities, e.g. chimneys, or floor heating).
In the interior corners of the frame special boundary conditions for domains with reduced radiation and convection can be placed, according to ENISO 10077-2 (cf. Figure 3).
The boundary condition for reduced radiation and convection can be used on the interior side of the domain, where the width b is normally as big as the depression d, although should not exceed 30 mm.
In our example, we can adjust the boundary conditions in two places on the interior side of the frame. With flixo professional this can be done in two ways:
| • | By setting a special boundary condition, which automatically recognizes the corner domains and sets the appropriate boundary conditions when preparing the calculation. |
| • | Manual assignment of the boundary conditions in the proper places. |
In this tutorial, we will examine the automatic version. As preparation, we will copy the special boundary conditions from the boundary condition databank into the upper boundary condition list.
Click on the arrows in the graphic below to navigate in Tutorial 4.
Summary
| • | The boundary conditions are listed in the Boundary Conditions Flyout  . In the lower part, the boundary conditions contained in the database are listed, whereas the upper list displays all boundary conditions present in the current document. |
| • | New boundary condition objects are created with the Boundary Condition tool  . Only the start point of a boundary condition is defined, which for exterior edges runs counterclockwise to the starting point of the next boundary condition. |
| • | You can either choose the active boundary condition from the upper list displaying all boundary conditions present in the current document or from the boundary condition tool properties. |
| • | Boundary conditions of the type frame recognize corners according to EN ISO 10077-2 and automatically set the correct h-value (heat transfer coefficient) respectively the correct R-value (thermal resistance), according to the norm. |
To continue the Tutorial you can click here or use the navigation buttons on the top.
Url: http://www.infomind.ch/bph/en/flixo/help/version5/index.html?tutorial4_defbc.htm