This document lists the building descriptors that are used in the compliance simulation. Users must provide valid data for all descriptors that do not have defaults specified and that apply to parts of the building that must be modeled.
The user shall provide accurate descriptions for all building envelope assemblies including exterior walls, windows, doors, roofs, exterior floors, slab-on-grade floors, below-grade walls, and below-grade floors. The user shall provide data for all of the required descriptors listed in 5.5 that correspond with these assemblies. However, the following exception applies:
•Exterior surfaces with an azimuth orientation and tilt differing by no more than 45° that is otherwise the same, may be described as a single surface or described as using multipliers. This specification would permit a circular form to be described as an octagon.
The user must designate space use classifications that best match the uses for which the building or spaces are designed. Space use classifications determine the default occupant density, occupant activity level, receptacle power, service water heating, lighting load, daylighting setpoints, and operating schedules used in the analysis. Process loads and refrigeration loads are also provided for applicable space types. Each space use classification must be associated with a ventilation space function which sets the outdoor ventilation requirement for the space. The user must choose a ventilation space function from one or more options depending on the space function.
The user must specify the space use classifications using the area category method. The area category method uses the area categories in the standard design, which were developed for lighting requirements. The area category method requires area category entry of floor area and space use designations. More than one building area category may be used if the building is a mixed-use facility.
The user may override the default assumptions for some building descriptors dependent on the space use classification with supporting documentation. Details are provided in Section 5.4 of this manual.
This document provides input and rating rules covering a full range of energy-related features encountered in commercial buildings. However, this goal is unlikely to ever be achieved due to the large number of features that must be covered, and the continuous evolution of building materials and technologies. Building features or systems not covered in this manual must apply for approval via the exceptional calculation method to the Energy Commission. This manual may be amended with provisions to model additional features or HVAC systems during the code cycle. When this occurs, it is the responsibility of the software vendor to pass the necessary acceptance tests and apply for approval for the new building feature(s).