Hi fellas! I have a building model with several zones. I need to get the AC sizing for each zone. After I simulated the model I got the sizing but when I plot the zone air temperature there is one zone that failed to reach the setpoint temperature. As I understand, the AC sizing which is the cooling capacity for each room can provide setpoint temperature during AC on. But in this zone, there are a few hours that the temperature above it (Image 1). Then I also plot the VRF total cooling energy, in the hour that the temperature increase, the cooling energy decrease (image 2). The thing that I don't understand why the sized AC can't maintain the zone air temperature always met setpoint?
Because the sized AC can't provide what I need so I tried to increase the cooling factor. The cooling factor of the previous simulation of 1 then I increased it to 1.15 then the cooling capacity indeed increase but the zone air temperature still failed to maintain setpoint whole time although it decreases a little bit (image 3). The cooling energy also decreases but not much as the previous simulation (image 4).
This is the AC schedule, for the sizing I used the design day (image 5) and this is the zone sizing for each room (image 6)
The zone is the bigger zone which has huge fenestration.
I will be very happy if you can explain why this can happen. Thank you.
