Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I think it takes EMS to fully model a two-speed fan. The coil control is not a problem but getting an air terminal to request a constant, low speed flow is not simple. The uncontrolled direct air terminal has an EMS actuator that makes it possible to fix the air flow at the low speed using EMS runtime programming. Then the VAV fan will follow the low speed flow requested at the air terminal. Cycling the low speed fan is even more challenging but can be done with short timesteps and EMS programming for explict thermostat-based control.
