This section describes how to use the Project Defaults tab.
When you create a project in Green Building Studio project defaults are automatically created. The project default settings cover all of the major building characteristics that will impact energy modeling: internal loads; space types; design temperatures; envelope constructions; and HVAC equipment.
Green Building Studio is able to import material properties and Revit is enabled to export that information to the web service through the gbXML file Using Building Elements Mode. For all other BIM models Green Building Studio assigns reasonable defaults to your project, based upon building type and size of your building. You can review these assumptions on the Energy and Carbon Results page of the Green Building Studio web pages, in the Building Assumptions section. More detailed information is available in the Green Building Studio Building Assumptions and Details topic as well.
The Green Building Studio Project Defaults feature allows you to modify these baseline characteristics when they differ from your project. This can be especially useful for modeling existing projects that may have been constructed years before the current energy codes went into effect. See the tables below for a comprehensive list of the characteristics of project defaults that you can modify and the studied in Design Alternatives.
|
Parameter |
Project Defaults and Project Templates |
Design Alternatives |
|
Orientation |
No |
Yes |
|
HVAC System |
More comprehensive list, including system that are below code compliance efficiency levels (more detail on HVAC) |
Includes only systems that meet or exceed code compliance levels |
|
DHW |
Yes |
No |
|
Roof Construction |
YES, a larger list of constructions and can differentiate between flat and pitched roof constructions (**** Link) |
Yes |
|
Exterior Wall Construction |
Yes |
Yes |
|
Underground Ceiling |
Yes |
No |
|
Interior Wall |
Yes |
No |
|
Underground Wall |
Yes |
No |
|
Interior Floor |
Yes |
No |
|
Raised Floor |
Yes |
No |
|
Slab on Grade |
Yes |
No |
|
Underground Slab |
Yes |
No |
|
Door |
Yes |
No |
|
Glazing and Skylight |
YES, a larger list of constructions but cannot differ by cardinal orientation. |
Yes, can differ by cardinal orientation |
|
Door Glazing |
Yes |
No |
|
Increase or decrease skylights and glazing area by cardinal orientation |
No |
Yes |
|
Condition type (i.e. heated, cooled, both, vented only, or semi-heated) |
Yes |
No |
|
Space type (applied to all spaces) |
Yes |
No |
|
Lighting Power Density |
YES. Can choose any numeric value and can choose in which scenarios to apply the default (i.e. Always; Only if Undefined; etc.) |
YES, but can only improve efficiency beyond code compliance in 10 percent increments |
|
Daylighting Controls |
No |
Yes |
|
Occupancy Sensor Controls |
No |
Yes |
|
Equipment Power Density (EPD) |
Can choose any numeric value and can choose in which scenarios to apply the default (i.e. Always; Only if Undefined; etc.) |
No |
|
Occupancy Density |
Same as above |
No |
|
Sensible and Latent Heat Gain |
Same as above |
No |
|
Design Temperature |
Same as above |
No |
|
Cooling and Heating On/Off Set points |
Yes |
No |
|
Outside Air Per Person |
Yes |
No |