90.1-2019
Space function inputs and how they translate to thermal zone and HVAC system analysis assumptions are defined by the following rules:
- Schedule Group: 12 different schedule groups are defined in COMNET Appendix C (COMNET 2017) for the Standard 1-2019 PRM. Each schedule group defines building-specific hourly profiles for thermostat setpoints, HVAC system availability, occupancy, lighting, etc. The schedules of operation may be entered by the user or defaulted to the values defined in COMNET Appendix C (COMNET 2017).
- Space Functions: Each building space is assigned one space function. Design internal loads and other space function input assumptions, including the assigned schedule group described above, may be input by the user or can be defaulted to the values defined in COMNET Appendix B (COMNET 2017). This is discussed in Section 3.4 of this manual.
- HVAC Zones: The makeup of spaces in thermal zones shall match the proposed building design. If HVAC zones have not yet been designed, they shall be determined in accordance with Section 3.3.1. Where HVAC zones include different space types, peak internal loads and other design inputs for the HVAC zone are determined by weight-averaging the space function design inputs by floor area. Thermal zone schedules are based on the schedule group of the predominant space function (by floor area) included in the thermal zone