Power, Cooling, Cables, Simulations of Heat Dissipation Short overview of ongoing work on these points Technical Coordination (Rolf Lindner et al.) Cooling and ventilation group (Daniel Gasser and Ricardo Rodrigues) 10 September 2003 Muon Electronics Meeting Burkhard Schmidt

Power Power reserved in UX85 Magnet:5MW Detector :2MW Power distribution defined

Detector Power Distribution [kW], without Magnet ItemDetector area Counting house area Barracks A/B + Racks close to detector Calorimeter19,23,5 IT/TT 20 Muon22,114,6 OT126 Rich 1&228,3 VELO7,618,7 VETO1,12 Total5393,1 Safety factor (PS, Cables, etc.)1,5 Total for the detectors with safety80140 DSS (1 rack) 1 ECS (4 racks) 45 Switches (5 Racks) 50 In barracks A and B (detectors) 236 Barracks D1 Max. per PCs Rack 12 Max. number of racks 47 ECS (1 rack) 10 In D1 barrack (PCs farm) 574 Item Detector area Counting house area Max. per PCs Rack 12 Max. number of PC racks 20 Total for future PC farm 240 Switches (2 racks) 20 ECS (1 PC rack) 12 TFC + L0DU (2 racks) 20 DSS (1 rack) 1 Spare for future switches, TFC, etc. 100 Spare for future detectors racks 90 In D2 barrack 483 General ST/CV 0 Gas (racks on platform near counting house) 10 Detector Cooling50 Pumps (for the VELO)5 Air conditioner (6*25kW for the barracks) 108 Light00 TOTAL & Total Power available (2MW)

Detector Cooling Counting House Area Detector Area Counting house air cooling capacity: 50kW

Cooling, Heat dissipation in the UX85 Cavern Large fraction comes from LV power supply cables To reduce dissipation:  move LV power supplies close to detector (constraints: radiation)  increase cable diameter (constraints: chicane through shielding wall) 11.5kW 55.9kW Counting house area Detector area

Detector cables passing through radiation shielding (Summary) System:Through Pass 84Through Pass 86 Power cables Signal cables Optical fibers Power cables Signal cables Optical fibers VELO VETO Vacuum Calorimeter Inner Tracker Trigger Tracker Outer Tracker Muon Magnet Rich Rich all numbers in dm 2 Through Pass 84 Through Pass 86 TOTAL (without the cable trays) Total cross section available through the chicanes: 70

As a result, the most critical part for detector services is the passage through the chicane of the radiation wall Construction of an 1:1 mock up of the chicane through the shielding wall The bare chicane exists in 157 Next step: mount cable trays and fill them with cables Chicane through radiation wall

350 mm >400mm Cabling, through chicane Counting house Detector

existing cable trays (from DELPHI general services) cable trays have to be added Status of cable trays

Cabling, through chicane  Space allocation per sub detector  Signal and Power separated  Packing factor: min 2 Pass x dm2 free space 300x100 Outer Tracker Outer Tracker Outer Tracker dm2 Power 100x100 Signal + Optical fiber Calori meter Calorimeter dm2 100x100 Power + Signal Optical fiber Mu on Muon dm2 100x50 Power + Signal Optical fiber Rich 2Rich dm2 Power 100x100 Signal + Optical fiber x100 Inner Tracker Inner Tracker dm2 Power 100x100 Optical + Signal Pass dm2 free space 300x100 Velo Power 7.49 dm2 Velo Signal 9.14 dm2 100x50 Veto dm2 Vacuum dm2 100x100 Signal + Power Rich 1 Rich dm2 Power 100x100 Optical + Signal Magnet dm2 100x100 Signal + Power Trigger Tracker dm2 100x50 Signal + Power +Optical Signal + Power +Optical

Rack distribution Counting house Behind radiation shielding Three floors Four barracks max. 150 racks 2 nd floor A3/B3 (Detector read out) 1 st floor D2 Ground floor D1 (PC farm)

LHCb Muon Station Simulation This simulations was made for the Muon Station 1, with the follow assumptions: The walls close to the RICH and ECAL systems are considered adiabatic, unless stated differently. The heat-flux in the moun chambers can only exit by the four smallest areas. The heat-flux in the muon chambers is equally distributed through the surfaces. Motivation: Understand temperature distribution for muon chambers and neighbouring detectors Studies provide input to develop “cooling system”

Boundary Location Global overview of the model Symmetry Inlet/Outlet

Boundary Location Region 1Region 2Region 3Region 4 Power [W]144 Area [m 2 ]0.494 Flux [W/m 2 ]292 Power [W]288 Area [m 2 ]1.494 Flux [W/m 2 ]193 Power [W]288 Area [m 2 ]4.716 Flux [W/m 2 ]61 Power [W]288 Area [m 2 ] Flux [W/m 2 ]16

With Pressure Conditions Inlet Temperature [ºC] 20 Max. Temperature[ºC] 40 Inlet Velocity [m/s]0.56 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 41 Inlet Velocity [m/s]0.76

With Inlet at 1.0 m/s Inlet Temperature [ºC] 20 Max. Temperature[ºC] 29 Inlet Velocity [m/s]1.0 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 34 Inlet Velocity [m/s]1.0

With Inlet at 2.0 m/s Inlet Temperature [ºC] 20 Max. Temperature[ºC] 24 Inlet Velocity [m/s]2.0 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 30 Inlet Velocity [m/s]2.0

With Inlet at 1.0 m/s (2) Inlet Temperature [ºC] 20 Max. Temperature[ºC] 29 Inlet Velocity [m/s]1.0 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 34 Inlet Velocity [m/s]1.0

With Inlet at 2.0 m/s (2) Inlet Temperature [ºC] 20 Max. Temperature[ºC] 24 Inlet Velocity [m/s]2.0 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 30 Inlet Velocity [m/s]2.0

With pressure and inlet boundaries Inlet Temperature [ºC] 20 Max. Temperature[ºC] 38 Inlet Velocity [m/s]1.0 Inlet Temperature [ºC] 20 Max. Temperature[ºC] 38 Inlet Velocity [m/s]1.0 Rich and ECAL systems as adiabatic walls and open side Rich and ECAL systems as 20ºC walls and open side

With pressure boundaries and open side Inlet Temperature [ºC] 20 Max. Temperature[ºC] 38 Outlet Velocity [m/s]0.62 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 37 Outlet Velocity [m/s]0.88 The boundary with Rich and ECAL systems are considered as 20ºC walls

With inlet at 1.0 m/s and pressure boundaries and open side Inlet Temperature [ºC] 20 Max. Temperature[ºC] 40 Outlet Velocity [m/s]1.0 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 38 Outlet Velocity [m/s]1.0 The boundary with Rich and ECAL systems are considered as 20ºC walls

With inlet at 2.0 m/s and pressure boundaries and open side Inlet Temperature [ºC] 20 Max. Temperature[ºC] 30 Outlet Velocity [m/s]2.0 Inlet Temperature [ºC] 25 Max. Temperature[ºC] 32 Outlet Velocity [m/s]2.0 The boundary with Rich and ECAL systems are considered as 20ºC walls

Considerations about the air extraction system Flux exiting by the special boundaries [W] Flux IN [W] Predicted efficiency of the extraction system Model with adiabatic walls and open side % Model with 20ºC walls and open side % The considered efficiency of the heat exchanger as 80%