To ensure that the simulated space-conditioning loads are adequately met, adequate capacity must be available in each component of the HVAC system (e.g., supply-airflow rates, cooling coils, chillers, and cooling towers). If any component of the system is incapable of adequate performance, the simulation program will report UMLH, which need to be addressed following the steps in Section 2.6. Adequate capacities are required in the simulations of both the proposed design and the baseline building. If the equipment capacity is not sufficient to meet demands, then UMLH are evaluated at the building level by looking at the UMLH for each thermal zone being modeled. The subsections below describe the procedures that shall be followed to ensure that both the baseline and proposed building models are simulated with adequate space-conditioning capacities.
90.1-2019
90.1-2022