Today, we switched off several devices related to all HVAC systems, including:
- AHU
- Chillers
- Cold and hot water pumps
The HVAC systems involved were: NEB, WEB, MCB, CEB Hall, CEB Clean Room, DET Lab, INJ Lab. For the AHUs of CEB, chillers and water pumps of Technical Building 1 were not switched off.
The attached list reports the timing of each action for each building.
Figure 1: The blue and purple curves correspond to the configurations with all devices switched-on and all devices switched-off, respectively. No significant impact on the sensitivity is observed, except for a slight reduction around 11.3 Hz, 13.6–16.5 Hz, 18.7 Hz, 54 Hz, 1118 Hz, 1256.7 Hz, 5200 - 5850 Hz. Further analysis will follow to confirm them.
Figure 2: the top plot shows the BNS range, and the bottom plot shows the temperature of the experimental rooms during the switch-off. The temperature variations are small (1 deg) in the experimental areas. No correlated impact was observed in the BNS range.
