I have a question regarding the core and shell proposed model. Here I use the HVAC main system designation to mean the main air loop, excluding terminal units. I summarized three scenarios for the proposed HVAC system for core and shell space. Please correct me if the summary is wrong or not complete.
1. The HVAC systems and terminal units have been designed for the core and shell project, but the function of the tenant space has not been determined yet.
The capacity, efficiency, supply fan power, and supply air flowrate should be hard sized for the HVAC system to be the same as what has been designed. The terminal unit type should be simulated to be the same as what has been designed, but the coil capacity and the airflow rate should be auto-sized.
2. The HVAC systems have been designed, but the terminal units have not been designed yet.
The proposed model simulates the tenant space terminal units to be the same as the baseline model. But the model simulates the main HVAC system to be the same as what has been designed, which includes hard- size for the capacity, efficiency, supply fan power, and supply air flowrate.
3. Neither the main HVAC system nor terminal units have been designed. The proposed model HVAC system should be simulated to be the same as the baseline model. The capacity, supply fan power, and supply air flowrate should be auto-sized for both the HVAC system and the terminal units. Additionally, the HVAC system efficiency should be calculated per ASHRAE 90.1 Appendix G.