3/05/2019 -

Do I need to prepare the model for Energy Analysis?

  1. Check that the Energy Analytical Model (EAM) in Revit is successful and there are no warnings


  1. Check that the correct mode is set in the Energy Settings in Revit.


To analyse a Conceptual Mass Revit model, the setting should be either ‘Use Conceptual Masses and Building Elements’ or ‘Use Conceptual Masses’.


To analyse a Detailed Revit model, please use the mode ‘Use Building Elements and Conceptual Masses’ or ‘Use Building Elements’.


For example, there may be issues if you try to run an Energy Model in Revit on a Detailed model and the mode is set to ‘Use Conceptual Masses’. The mode ‘Use Conceptual Masses and Building Elements’ will usually cover all model types as it will identify each.


Note: If you change the Mode in the Energy Settings and then go into the Edit section to look at modifying these, they will be greyed out until you choose Ok for the first window. You may then re-enter the Energy Settings to edit other details for Target Percentage Glazing, Sill Height etc.


  1. You may set the Conceptual Mass Target Percentage Glazing if you wish. This is not strictly required as you will be able to do this inside FenestraPro.


  1. Check that the Phase Setting in the Energy Settings is the same as the View being used in Revit.


  1. Check that the Perimeter Zone is suitable for your intended purposes. This is the distance between the envelope of the building and the Core. This area will be heated and cooled at a different rate to the Core as it is subject to Solar Heat Gain.


  1. Check that Analytical Resolutions are correct (In most cases, Revit’s default values may be left as they are).


  1. For Conceptual Masses, assign mass floors. This may be done by selecting the Mass and then you will see on the Revit Menu, a button for Mass Floors. Click on this and select from the list of levels in the list – all levels (except the roof level) should be checked.


  1. Check the Lowest Level to be defined in Energy Settings. You may have levels such as Basement, Foundation, Crawlspace, Parking etc which are not relevant for Energy Analysis. These may be excluded by setting the lowest level for starting analysis. The lowest level set here may not necessarily be the lowest level in the project.

Note: Levels below the Level set here will be treated as unconditioned space (not heated or cooled).

  1. Check that the Mass touches this lowest defined Level (sometimes a small gap may have been left when creating the model and a warning may show when you create the Energy Model)


  1. In a Mass model, if a mass Core (Elevator shaft or stairwell) runs through a mass or several masses, it should be removed as this will interfere with the analysis.


  1. Mass as one volume rather than separate pieces. How the Mass model is created is important as it defines how much control you will be able to exercise over the Surfaces. A footprint extruded up through the building and saved, will only allow selection of one mass face on each orientation.


It is recommended to create the Mass floor by floor by extruding a shape to the next level and then copy and pasting it to the next level (‘Align to Level’) if the footprint continues to the next level. If the footprint changes, a new shape may be created on that level and extruded.


All of this should be done in the Mass Editor and when the building is complete click ‘Finish’ so that one Mass is created. When you click on the project, all parts should be selected. This will allow you to select a Surface on each storey and assign glazing specifications, percentage glazing canopies and fritting independently.


  1. Check that the Building Enclosure is complete. It may help to look underneath the project to check floors where there are overhanging elements, balconies etc.


  1. Check for Mass models that Mass Floors have been assigned. This will identify a level as a mass floor and will define how the Energy Model analyses the project.


  1. Check that ‘Areas and Volumes’ in Area and Volume Computations are set rather than ‘Areas Only’.


  1. Check that the Levels are set correctly in the project. The Levels should relate to element locations such as Floors, Roofs, Parapets etc. Levels sometimes may be placed incorrectly and this will have consequences for Rooms, Mass Floors, the Energy Model etc.


  1. To use the Spatial Elements option – Assign Rooms and Spaces in the model. Linked models should have their Rooms and Spaces placed again in the Host model.


  1. Check the Room upper extents that these reach the floor level above (minus the slab thickness). This may be checked in a Section view by turning on visibility for Rooms. Where default Room heights do not extend to the next level, FenestraPro will not create Surfaces for these zones and these are then not included in the results.


  1. Curved geometry and Stacked Walls may not be read fully in FenestraPro. Support for curved geometry and Stacked wall types is currently in development.


  1. Set the Site Location correctly in Revit. This is important for Solar and Climate Data. This may be done in the Manage Tab in Revit.


  1. Ensure that the Energy Units are set correctly in Revit. The model units may be set in the Manage Tab of Revit (imperial or metric) and Energy Units should also be checked for each category. Common units and Energy Units are independent and while one may be set to imperial, the other may be set to metric by error.


  1. Ensure that Glazing Properties and Element Properties are assigned in Revit. Analytical properties should be assigned for elements in the project (walls, floors, roofs and glazing). This may be done by selecting an element type and going to Edit Type in Revit. For glazing, in the Analytical Constructions area, you may set glazing properties by selecting from the list provided. For solid elements (walls, roof, floors), you may enter the Construction section (Structure – Edit) in Edit Type and assign materials with thermal properties.


  1. Check that Elements such as Floors, Walls and Roofs are Room Bounding. Linked models should also be set as Room Bounding. This will ensure that if Rooms or Spaces are placed, that they will use these elements to limit the extents of the room/space.


  1. Linked Files should also be set to ‘Room Bounding’ so that their geometry is included.


  1. Check that element ‘Functions’ are correct in Edit Type – Exterior/Interior. Elements that are external should have ‘Exterior’ function in Revit. Internal elements such as floors and walls should have ‘Interior’ function in Revit. If elements are not categorised correctly, FenestraPro may not read them. Curtain Wall families which are used externally and have an ‘Exterior’ function may sometimes be also used internally and these will be picked up and included (incorrectly) in the list of external Surfaces.
Back to Insights