Test DET HVAC , 23 April 2026

7.52 UTC
supply fan: 31.9 Hz
return fan: 13.9 Hz


08:02 UTC --> supply and return AHU OFF
Air flux velocity- supply air duct: 0 m/s 
Air flux velocity- return air duct: 0 m/s 

08:26 UTC --> Water distribution isolated (hot water valve closed first, followed by the cold water valve, both located in the CEB AHU hall room).
P.S. The air duct distribution valves are moving because they are set to automatic mode.

08:49 UTC--> the opening of all supply and return air distribution valves are manually set to 0% (fully closed)

09:10 UTC--> external valves are closed

09:39 UTC (few minute)--> open and close the door of the silenziatore

10:23 UTC --> Water distribution open 

10:43-10:46 UTC---> opening and closing of the silencer door

10:53 (1 min) UTC---> tapping on return duct (top)

10:55 (1 min) UTC --> tapping on supply duct (bottom)

11:06 UTC--> opening  of the filter after supply fan

11:13 UTC--> all valves (air distribution and external) are opened

11:24 UTC --> supply and return fan switched ON

**************************************

Test of supply and return fan speed

*** Return fan manually fixed @ 13.8 Hz (10 Hz)***


13:08 UTC--> supply fan 17 Hz (12.11 Hz)
supply air flux velocity: 1.03 m/s 
return Air flux velocity: 0.1 m/s 

13:21 UTC --> supply fan 23 Hz (15.7-16 Hz)
supply air flux velocity: 1.49 m/s 
return Air flux velocity: 0.15 m/s 

13:35 UTC --> supply fan 29 Hz (22.6-22.9 Hz)
supply air flux velocity: 2.72 m/s 
return Air flux velocity: 0.33 m/s 

13:48 UTC --> supply fan 35 Hz (29.5 Hz)
supply air flux velocity: 4.1 m/s - 3.4 m/s (second reading)
return Air flux velocity: 1.17m/s - 0.99 m/s (second reading)

14:07 UTC --> nuova sas , supply valve closed
14:15 UTC --> nuova sas , supply valve open
14:25 UTC --> nuova sas , supply valve automatically closed

14:28 UTC --> supply fan 41 Hz (36.5 Hz -36.9 Hz)
supply air flux velocity: 4.3 m/s
return Air flux velocity: 2.1 m/s  

14:43 UTC --> supply fan 50 Hz (46.7 Hz)
supply air flux velocity: 4.8 m/s
return Air flux velocity: 2.27 m/s 

14:55 UTC--> supply fan set to automatic mode
14:57 UTC--> return fan set to automatic mode


*** Supply fan manually fixed****

15:16 UTC ---> supply fan at 30 Hz (24 Hz)
return fan 10 Hz (13.8 Hz)

15:19 UTC --> retun fan 17 Hz (18.2 Hz)
supply air flux velocity: 2.8 m/s
return Air flux velocity: 0.26 m/s 

15:31 UTC--> retun fan 27 Hz (26.1 Hz)
supply air flux velocity: 2.85  m/s
return Air flux velocity: 1.10 m/s 

15:45 UTC--> test for the night
return fan 10 Hz (13.8 Hz) -- velocity 0.3 m/s
supply fan at 33 Hz (27.5 Hz) -- velocity 2.9 m/s