09/07/01
=> ST-CV used values
=> Previsionnal values
=> Integration services values
=> Pump power
=> Excel File
These values come come from D. Gasser (ST-CV) 07/2000. All values in kW. They were
obtained from an Ecal cooling wokshop, with the electrical heat dissipation.
1.2 W/channel
| ECAL Endcaps | ECAL Barrel | |
| VFE | 20 | 74 |
| LVR | 10 | 36 |
| LV cables inside E E/B | 2.1 | 8.3 |
| LV cb LVR-E E/B | 2.3 | 8.7 |
| LV cb inside CMS | 3 | 10.5 |
| Total | 38 | 137 |
| TOTAL | 175 kW | |
Even if 10% of the heat released in VFE is supposed to be taken by the "regulating" circuit, we keep the total value for the power circuit.
For the regulating circuit, it is calculated from the power circuit (10% of VFE) plus the heat that can come from the ambiant.
| ECAL Endcaps | ECAL Barrel | |
| 10% VFE | 2 | 7.5 |
| Ambiant | 0.6 | ? |
| Total | 2.6 | 7.5 |
| TOTAL | 10.1 kW | |
The following table gives the (rounded) values we use in our calculations.
| ECAL Endcaps | ECAL Barrel | TOTAL | ||
| Power | 50 kW | 150 kW | 200 kW | |
| Regulating | 4 kw | 10kW | 14 kW |
The power dissipated inside the Ecal electronics is growing. As far as we know today,
the power per channel is supposed to be 1.6 W.
We make design with 2W per channel.
In a second time, we had a margin (15%) and the power given by the pump to know the total
heat to exchange.
| ECAL Endcaps | ECAL Barrel | |
| VFE | 33 | 122.4 |
| LVR | 16.7 | 60 |
| LV cables inside E E/B | 3.6 | 13.8 |
| LV cb LVR-E E/B | 3.8 | 14.5 |
| LV cb inside CMS | 5 | 17.5 |
| Total | 62 | 228 |
| TOTAL | 290 kW | |
| ECAL Endcaps | ECAL Barrel | |
| 10% VFE | 3.3 | 12.2 |
| Ambiant | 0.6 | ? |
| Total | 3 | 13 |
| TOTAL | 16 kW | |
| Pump | TOTAL | ||
| Power | 11 | 344 kW | |
| Regulating | 49 | 68 kW |
From R Pintus (EP/TA3).
| ECAL Endcaps | ECAL Barrel | |
| ? (VFE) | 21.1 | 76.3 |
| Thermal screen | 12 | |
| LVR | 9.5 | 34.2 |
| LV Cables USC-UX | 62.7 | |
| TOTAL | 216 kW | |
The diferencies between this value and the one used by ST-CV has 2 origins.
- The thermal screen was not taken into account in CV value
- The LV cooling requires 63 kW here instead of 35 kW in the former value.
In most of the industrial processes, the heat that the pump gives to the fluid is small compared to the heat given to the fluid during the process. Therefore, this power is not taken into account in the calculus. In our case, especially the regulatiung circuit, we have to include this heat, as it is important compared to the temperature elevation of the fluid in the cooling process of the sub-detector.
To calculate the pump power, we need the flow and the head loss. A first calculation of the head loss for the power circuit gives values of 40m. The regulating circuit should have less head loss, but as the path is not well known at the moment, we take the same value. We give a range of values as the calculations are still preliminary. We also consider that the pump will be air cooled, so the heat given to the fluid correspond to the absorbed power of the pump(P=g*Q(kg/s)*H/Eff, with Eff=0.7).
| Circuit | Flow in l/s (m3/h) | Head loss in m | Power (kW) |
| Power | 13..15 (45..55) |
40..50 | 7..11 |
| Regulating | 60..70 (210..250) |
40..50 | 34..49 |