You examine analytical surfaces to assure that interior and exterior surfaces are correctly identified. The classification of surfaces maps to the construction of the wall. For example, an exterior wall surface will use an exterior wall construction. See Building Construction Dialog.
- In the preview of the Heating and Cooling loads dialog, on the Details tab, click Analytical Surfaces, and expand the zones.
Spaces display according to the following categories:
Occupied Space 
Unoccupied Space 
Plenum Space - Expand the spaces in the Building Model.
The hierarchy expands to display color-coded surfaces: Roofs, Interior and Exterior Walls, Floors, Windows, Doors, Slabs, Underground Surfaces, Skylights, Ceilings, and Air (Openings). These can be further expanded to display the individual surfaces and openings for each space. See Surface Element for information about surface and opening names.
Tip: You can right-click a zone to expand all or select all spaces in the zone. - In one of the spaces, select a surface type (for example, Interior Walls), and click
Isolate. Note: The term Roof as used for an analytical surface describes a top surface that is not bounded by spaces on both sides. The surface could be a ceiling, or an actual roof.You can also select individual surfaces from within the surface type folder for a space.
- Zoom in, pan and spin the analytical model as needed to examine all the surfaces in the model, checking to be sure that the surface is correctly identified.
For example, interior walls should display for the walls that are actually interior. A wall is considered to be interior if spaces are placed on both sides of the wall, or if its Function type parameter is specified as Interior or Core/Shaft. If you detect surfaces that are incorrectly identified, you must cancel the Heating and Cooling Loads dialog, and fix the problem in the building model.
Analytical surfaces that are classified as air surfaces are ignored by the load calculation.
- If warnings display for a space, click
(Show Related Warnings) to learn the cause, then cancel the Heating and Cooling Loads dialog and correct the problem in the building model. Review and correct warnings until all of the warnings have been resolved throughout the model.