Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
It seems likely that the reduced mechanical ventilation rate is caused by some sort of control. The best way to understand what is going on it to run a short simulation with timestep outputs. The "Mech vent + Nat vent + infiltration" output at timestep level will show you more clearly what is going on, perhaps showing some periods with 4 ac/h while others have zero. Is it perhaps possible that, while the hourly average indoor air temperatures are generally above the mech vent minimum inside temperature, the zone air temperature drops below 22.7 degC at times resulting in zero ventilation flow rates?
