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Condition Description Mitigation

Missing elements, elements not set to room bounding and/or 'Gaps' > 1.5'-3'

Spaces comprising the EAM are determined based on a 'flood fill' type concept using building elements set to room bounding. While small gaps and overlaps can be processed, if elements are missing entirely, are not set to room bounding, or there are gaps greater than approximately 1.5 to 3-feet (which you can adjust with Analytical Space Resolution, space will 'leak' and those parts of the building will be omitted from the EAM created. When the EAM is viewed in a third party analysis tool, if parts appear missing then this is usually the cause. One particular sign this has happened is the creation of many 'Shade' type surfaces which can soon exceed current simulation limits (see DOE2 limits in the known issues below). (NOTE: If a space leaks to the exterior space, it will be omitted from the EAM, but another possibility is that some interior spaces may leak into one another, combining into a single interior space).

View the Revit model and check for: Missing elements such as walls,

roofs, or floors. Add these elements where required.

Key elements such as walls, roofs, and floors that are not set to room bounding. Set to room bounding where required.

Gaps between elements generally greater than 1.5 to 3-feet. Close these gaps where required.

In-place families When key elements of the building envelope are composed of in-place families these will be omitted from the EAM created.

In-place families are currently unsupported.

Columns Surfaces will be omitted from the EAM created, apart from some shading.

Columns are currently unsupported and depending on size may or may not have a significant impact on validity of the energy analysis.

Small spaces and surfaces Spaces and/or surfaces smaller than approximately 1.5' to 3' wide may be omitted from the EAM created or in the case of spaces encompassed in a larger adjacent space.

Very small spaces and surfaces are currently unsupported but are unlikely to have a significant impact on the validity of the energy analysis. Use Analytical Space Resolution and Analytical Surface Resolution settings to adjust gaps and boundaries.

Openings in curved walls Where Revit openings are present in curved walls that surface will be omitted from the EAM created.

Openings in curved walls are currently unsupported.

Note: The dimensions of 1.5' to 3' quoted above are based on the default analytical space and surface resolution values. The default values for these parameters have been determined to provide an optimum balance between EAM accuracy and processing time for most Revit models. However as Revit model size, complexity and quality can vary widely it can sometimes be beneficial to modify these parameters in order to provide greater EAM accuracy and/or reduce EAM processing time

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Other Known Issues

Revit Design Options: These are unsupported and only the main model can be used for energy analysis using building element mode. Any elements in a design option that form the overall building envelope may cause spaces to leak and will be omitted from the analysis.

Revit room/space elements: While the EAM created from building elements works independently of room or space element geometry, if present any data such as room name or space occupancy, lighting, equipment etc. will be used in the energy analysis. However, the EAM can only use the data from one Revit room or space object per EAM space.

Revit room/space separation lines: Where present these are used to create separate EAM spaces. However, no surfaces are currently created between the adjacent spaces where the separation lines exist. This means that no heat transfer is simulated between the two spaces. Assuming both spaces are set to the same condition and temperature set points, this will have minimal impact on the validity of the energy analysis.

DOE2 limits: Green Building Studios underlying energy simulation engine DOE 2.2 has certain limits on the number of EAM spaces and surfaces it can process and very large, complex Revit models can exceed these limits.