This morning, we performed a test on the valves' opening of the DET supply and return air duct distributions in order to evaluate the impact of the noise in DET Lab.
The attached drawings show the distribution of the supply (blue) and return (red) air ducts. The position of the valves along the ducts and in the different areas is indicated by the label RP (regolatore di portata, flow regulator).
The table reports the opening of the valves (checked through Kieback & Peter interface), which are normally operated in automatic mode, as this is their standard working configuration (unlike those in INJ, which are in manual mode).
********************* VALVES' OPENING (automatic mode) ******************************
| Area | Supply valve opening (%) | Return valve opening (%) |
| SAS | 0 | 10 |
| New SAS (nuovo SAS) | 8 | 6 |
| Minitower A (DET area) | 22 | 0 |
| Minitower B (SQZ area) | 23 | 0 |
0% corresponds to a fully closed valve
100% corresponds to a fully open valve
****************************************************************************************
Before starting the test focusing on the valve of the Minitower A area, we performed a few actions:
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~08:38:25 UTC – BACnetServer restarted;
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~08:54 UTC – the supply and return fan frequencies (HVAC_FREQ_OUT/IN) were manually fixed at 27.4 Hz and 13.8 Hz, respectively, through the Kieback & Peter control interface → Forzatura Manuale CTA. These values correspond to the operating configuration, which remains unchanged between SCIENCE and ACCESS modes (as referred by Davide Soldani).
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all the supply and return valves of the four areas were set to 5% opening by switching them from automatic to manual mode. The action times are listed below:
| Area of valves | Time (UTC) | Note |
| SAS | ~09:07 | |
| New SAS | ~09:21-09:22 | |
| Minitower A (DET area) | ~09:28-09:29 | |
| Minitower B (SQZ area) | ~09:35 | supply fan starts to oscillate between ~(27-27.4) Hz --> to be checked! |
At this point, we changed the opening of the supply and return valves of the **** Minitower A area (DET lab)***:
| Time (UTC) | Supply valve opening | Return valve opening | Note |
| ~09:54 | 5% | 50% | |
| ~10:09 | 5% | 90% | |
| ~10:24 | 5% | 5% | |
| ~10:31 | 50% | 5% | |
| ~10:46 | 90% | 5% | |
| ~11:05 | 5% | 5% |
At the end of the test, we restored the automatic mode for the valves in each area and then for the fans, performing the actions in sequence:
| Time (UTC) | |
| SAS supply and return valves | ~11:15:21 |
| New SAS supply and return valves | ~11:20:49 |
| Minitower A supply and return valves | ~11:28:25 |
| Minitower B supply and return valves | ~11:43:06 |
| Supply fan | ~12:01:06 |
| Return fan | ~12:21:36 |
Figure 1 shows the acoustic noise (ENV_EDB_MIC) inside the DET Lab during the test. Analysis will follow.
The valve opening values in automatic mode returned approximately to their initial settings, except for the New SAS area, which shows 0% on the interface (Davide Soldani has been informed)
