2.2.4 Space Use Classification Considerations

Thermal blocks may contain up to ten different space use classifications, provided the spaces have similar space conditioning requirements. If the building area method is used, each thermal block must be assigned to one and only one building area category. For space classifications that are combined in a single thermal block, the spaces must meet all of the following conditions:

• Use the same operating schedule.
• Use the same space temperature schedule.
• Have similar internal load power densities. Combined lighting, receptacle, and process equipment power densities that differ by no more than 2.0 W/ft² or a factor of two may be considered similar.
• Have similar occupant densities. Occupant densities (i.e., densities represented in floor area per occupant [under peak design conditions]) that differ by no more than a factor of three may be considered similar.