In Conceptual Mass models, the glazing percentage for the entire model may be set in the Performance Manager. If individual Surfaces are subsequently modified, other Surfaces which remain unlocked may have their glazed areas also adjusted, as the system will try to maintain this overall percentage for the model. To achieve this, other Surfaces (which are not selected) will have their glazing percentage/glazed areas adjusted to maintain the overall value for the model.
If you do not wish this to happen, some Surfaces may be locked to have their settings fixed temporarily. They may always be unlocked again later.
For example, percentage glazing may be set to 40% for the entire model in the Performance tab.
A smaller selection of surfaces may then set to 80%. (For example, here Facades 4,6 and 8 are selected and these will be set to 80%).
The application will attempt to maintain the overall % setting for the model (40%), while also accommodating the 80% glazing on this selection of Surfaces.
This means that Facades/Surfaces that are unlocked (available for modification) may be adjusted to accommodate the new changes.
When selected Surfaces are set to 80%, others (that not locked) may be adjusted down (eg. from 40% to perhaps 35%) in order to maintain the overall 40% for the model. This will depend on how many surfaces are increased, the area of these Surfaces and their effect on the overall model.
For example, if only a small surface is set to 80%, this may not affect the remaining surfaces whose areas are larger.
FenestraPro will attempt to keep the overall 40% for the model by balancing out the total glazing percentage over the remaining Surfaces.
Note: Only Surfaces that are unlocked will be assigned a new percentage area. Surfaces that have been locked will not be affected and will remain at the value that was set. If you wish to maintain a percentage for a specific Façade/Surface, it should be locked to prevent changes.
If enough Surfaces are then also raised to 80%, there will come a point where it will not be possible to maintain the overall 40% total any longer. The remaining Surfaces will be adjusted, and the overall percentage itself, may have to fall (in the example below – remaining Surfaces that were not locked have their areas adjusted down from 40% to 23.5%). The figure in the Performance Manager will then also be adjusted to reflect this.
Note: Please refer to Section 13.0 below (Typical Workflow 1.) for a sample workflow on Applying Glazing Percentages to the Mass Models.
Note: If you wish to modify the model geometry while FenestraPro is open, it is better practice to close the application, make the changes in Revit and when ready, relaunch the application. This will allow a new Energy Model to be created and results to be updated.
To divide up the Surfaces more, use the Mass Editor in Revit to add edges to Surfaces. This will break up the Surfaces into smaller areas for greater isolation and control. New Surfaces will be assigned to these areas in FenestraPro when launched again.