Hello colleagues,
I have a question from our energy modelling team. The question is about baseline HVAC systems modelling.
ASHRAE 90.1, appendix G, point G3.1.1 requires modelling systems 5-8 one per floor. In accordance with point G3.1.2.8 requirement design airflow rates shall be based on a supply-air-to-room-air temperature difference of 11°C (20°F). In a modeled building, there are groups of rooms with deferent heating and cooling setpoints on each floor. If we model one system for all rooms on one floor, we will not complete point G3.1.2.8 requirement (temperature difference) for some rooms. Do we need to divide the system into several separate systems on one floor in this case?