3.4.2 Occupants

Number of Occupants

Applicability

All projects

Definition

The number of persons in a space. The number of persons is modified by an hourly schedule (see below), which approaches but does not exceed 1.0. Therefore, the number of persons specified by the building descriptor is similar to design conditions as opposed to average occupancy.

Units

The number of persons may be specified in an absolute number, ft²/person, or persons/1000 ft².

Input Restrictions

Defaults are provided in Appendix B, but other values may be used if they better represent the design conditions.

Baseline Rules

The number of occupants must be identical for both the proposed design and baseline building.

 

Occupant Heat Rate

Applicability

All projects

Definition

The sensible and latent heat produced by each occupant in an hour. This depends on the activity level of the occupants and other factors. Heat produced by occupants must be removed by the air conditioning system as well as the outside air ventilation rate and can have a significant impact on energy consumption.

Units

Btu/h specified separately for sensible and latent gains

Input Restrictions

Defaults are provided in Appendix B, but other values may be used if they better represent the design conditions.

Baseline Rules

The occupant heat rate for the baseline building shall be the same as the proposed design.

 

Occupancy Schedule

Applicability

All projects

Definition

The occupancy schedule modifies the number of occupants to account for expected operational patterns in the building. The schedule adjusts the heat contribution from occupants to the space on an hourly basis to reflect time-dependent usage patterns. The occupancy schedule can also affect other factors such as outside air ventilation, depending on the control mechanisms specified.

Units

Data structure: schedule, fractional.

Input Restrictions

Defaults are provided in Appendix B and C, but other values should be used when they are available and better represent the design conditions.

Baseline Rules

Occupancy schedules are identical for proposed and baseline building designs