This document lists the building descriptors that are used in the compliance simulation. Users must provide valid data for all descriptors that 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 section 5.5 that correspond with these assemblies. However, the following exceptions apply:
•Exterior surfaces whose azimuth orientation and tilt differ by no more than 45° and are otherwise the same may be described as a single surface or described 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 individual spaces within the building are being designed. Space use classifications determine the default or prescribed occupant density, occupant activity level, receptacle power, service water heating, lighting load, area-based minimum outdoor ventilation air, daylighting setpoints, and operating schedules used in the analysis. Process loads and refrigeration loads are also provided for applicable space types.
The user must specify the space use classifications using either the complete building or area category methods but may not combine the two types of categories within a single analysis. The building area method assigns assumptions based on average values that occur within typical buildings of the designated type. The complete building method is recommended for use when detailed space planning information is unavailable. More than one building area category may be used in a building if it is a mixed-use facility.
The area category method uses the area category 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. The area category method can be used whenever design information is available with the necessary detail.
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.
The goal for this document is to provide 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. For compliance and for Reach code, building features or systems not covered in this 'manual must apply for approval via the Exceptional Calculation method to the Commission. However, 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).