2.0.1 Model Preparation

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Model Preparation 


All Model Types

          1. Check that the Site Location is correctly set in Revit since this will affect Solar Data. This may be set in the Manage Tab – Location.
          2. Model Orientation on site should be correctly positioned. You may need to rotate True North in Revit to achieve this. This may be done in the Manage Tab – Rotate True North. (Please do not rotate the model in a Revit View as this will not achieve the same outcome).

          1. Check that your Levels are correctly set and that they align correctly with building elements.
          2. Ensure that the Building Type is correctly set in the Energy Settings. This will define the occupancy hours. Alternatively, this may be adjusted in FenestraPro’s Building Manager.
          3. Create an Energy Model in Revit and check for relevant warnings in the Manage Tab – Warnings.

          1. Check that the Phase in the Energy Settings matches the one set in the Revit View.
          2. Check the Perimeter Depth in the Energy Settings is correct (typically it is set to 20 feet or 6 meters).  Note: When using the Building Elements Mode in Energy Settings, you will not be able to set the Perimeter Depth.  In this case, change the mode to ‘Use Conceptual Masses and Building Elements’ in order to edit the value.
          3. Use Masses for Surrounding Objects/Neighboring Buildings. These can be included, if you wish, to calculate Shading Effects.Mass Models
            1. Assign Mass Floors in Revit by selecting the Mass and using the Mass Floor Tool on the Revit Menu.
            2. You may set Target Percentage Glazing in Revit’s Energy Settings or control this later in FenestraPro
            3. The Mass should physically touch the Level that is defined in the Energy Settings (the Ground Plane).
            4. The Mass should be created as recommended.  This may be done by modeling level by level while in the Mass Editor.  When you click on ‘Finish’, this will be one mass but surfaces created in FenestraPro will be adjustable on each level.  Extruding a mass from a footprint to the roof level will limit your ability to control separate zones.
            5. Avoid core extrusions within the Mass (elevator/core shafts etc).


            Detailed Models

              1. Check that Thermal Properties are set for elements in Revit. Analytical Properties (R-Values and U-Values) will need to be assigned to model elements. This may be checked by selecting elements and using Edit Type to check if these are assigned.
              2. Avoid large gaps in the building enclosure. This will interfere with orientations and results displayed.
              3. Check thatAreas and Volumes’ is used under ‘Rooms and Areas’ in Revit.
              4. Element Functions should be correctly set. Exterior walls and Floors should have an ‘Exterior’ function. Internal Walls (solid and curtain walls) should have an ‘Interior’ function. Elements with Interior functions will be excluded in the results.  Note: The Energy Model in Revit may identify this as an external element despite the Revit function setting. The Revit setting however will be used by FenestraPro and the element will be excluded.
              5. Avoid overlapping elements (floors/walls etc) or multiple instances of elements in the same position.
              6. Ensure that relevant elements are Room Bounding. Linked models should also be Room Bounding (this may be set in the Host model).
              7. Check that Rooms/Spaces are placed correctly and upper limits extend to the the next level.  This is relevant when using the Spatial Option. Creating a Room Schedule is helpful for identifying redundant rooms, rooms outside the model etc.
              8. Check Room Computation Heights are correct for measuring the room perimeter.
              9. Place Spaces over Ceilings if using Spatial Elements option. This will ensure that all external wall areas will be included in the results.
              10. Avoid Room separation lines around the model perimeter which interfere with Energy Analysis.
              11. Curtain Walls should be centered in Host walls to read fully with the Spatial Elements option. Curtain Walls that are placed with an offset may not be included in the results.
              12. Note that Stacked Walls may not read correctly with Spatial Elements. This is because properties cannot be assigned to these wall types in Revit.
              13. Avoid Double Layers of Walls with glazing hosted on the inner wall.

            1. Review warnings in Revit under the Manage Tab.  This will list any issues in the model which are affecting a successful Energy Model.  Not all issues may be listed here however.  For instance, Masses which have void extrusions or are modeled as one extrusion from Ground to Roof will not appear as issues but these conditions may affect analysis results.

          1. Check that internal walls do not extend into the core area of external walls (this may interfere with identification of elements and energy analysis)

            1. It is recommended to Close any Revit plan views if they are open in the background.  Also the application is best used with a default 3D View rather than using other Revit views.
            2. Structural Columns that are set to room-bounding may cause issues (high results) if they are touching or very close to glazed elements. A workaround for these is to temporarily set them to non room-bounding.

            For more details of each item, Please refer to Sections 12.1.1, 12.1.2 and 12.1.3 below.


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