Building Definition

This section describes how to define the building for the project. The room definitions are used for indoor photometric calculations. They can also be used to label circuits in one-line device schedule.

It is not necessary to model the building in your project if you are not going to use the features the building model provides.

Common Building Definition Information

The values that can be specified for floors and rooms within a building are listed below. Some values can be set in the room schedule only, while others can have a default set in the schedule that can be changed for individual floors or rooms.

Schedule-Only Settings

This section describes room values that can only be set in the schedule. These cannot be changed for individual rooms. If you need to include a room that has a different setting for one of these values, a new record must be created in the schedule.

Foot Candles Desired: The amount of light that needs to be provided in the room.

Lighting Power Density: The watts per square foot allowed in the room according to the local energy code.

Illuminance Category: Illuminance categories are taken from the IES Handbook.

Individual Floor and Room Settings

This section describes building definition values that be changed for individual floors and rooms. The value in the room project schedule is the default value.

Room: The name of the room.

Room Type: The room type take from the room project schedule. Determines the default settings for the room.

Floor: The floor the room is associated with, which can affect the ceiling height and room cavity ratio.

Area: The area of the room in square feet. This value is based upon the room outline inserted on the drawing. To change the value, change the room outline. The value cannot be changed in any of the room dialog boxes.

Room Cavity Ratio: The room cavity ratio is a measure of how effectively the light from a fixture it used to illuminate a room. It is calculated based upon the geometry of the room using the following formula:

Room Cavity Ratio = 2.5 x (Ceiling Height - Workspace Height) x Perimeter / Area

Description: The description of the room. The default value is the Room Type.

Ceiling Height: The height of the ceiling for this room. The default is set in the floor definition. See the Distance Input Format section for more information on specifying this elevation.

Workspace Height: The elevation of the workspace above the floor level. Used to calculate the room cavity ratio for indoor photometric calculations. See the Distance Input Format section for more information on specifying this elevation.

Wall Cavity Reflectance: The reflective value of the walls in the room type. Used together with the IES file associated with a light fixture to calculate the coefficient of utilization of the fixture for indoor photometric calculations.

Effective Ceiling Cavity Reflectance: The reflective value of the ceiling in the room type. Used together with the IES file associated with a light fixture to calculate the coefficient of utilization of the fixture for indoor photometric calculations.

Effective Floor Cavity Reflectance: The reflective value of the floor in the room type. Used together with the IES file associated with a light fixture to calculate the coefficient of utilization of the fixture for indoor photometric calculations.

Dirt Depreciation Factor: Factor by which the photometric calculations are reduced due to dirt in the room.


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