ATCA Crate Infrastructure in place Rack in D

ATCA Crate / Infrastructure in place - Rack in D 3: dimension - Electrical power availability - Tell 1 racks running in D 3 (air ventilation, safety aspect) - Temperatures, power of crates in D 3 - Conclusion 13 Octobre 2011 Laurent Roy 1

Rack in D 3 dimensions: 2 m 54 x 60 cm x 90 cm - Useful space : height 56 U (2 m 49) ~10 U need to be free at the bottom for cabling and water valve access. width 19’’ (48, 3 cm) depth ~73 cm - Level 1 crates : 11 U (9 U+2 U Fan) x 19” x ~72 cm - ATCA crate (ex: ELMA catalogue) dimensions OK, few mechanical adaptation (26 U instead of 22 U used for 2 crates). 13 Octobre 2011 Laurent Roy 2

Electrical Power for Frond End racks in D 3 Maximum available: ~ 410 k. W Consumption total: ~ 70 k. W (in ‘Physics’ mode) No problem with ‘general power’ (17% of the capacity used) 13 Octobre 2011 Laurent Roy 3

- Electrical power available per rack distribution designed for 11 k. W/rack max. 16 A circuit breakers (Merlin Gerin C 60 H – D 16 A). 7 single phase power outlets available (burndy connector). - ATCA crate consumption: ? ? ex. ELMA catalogue: Output PSU 2799 watt maxi -> input (80%) ~ 3. 5 k. W maxi = ~ 16 A circuit breaker should be Ok (to be check with the manufacturers) 13 Octobre 2011 Laurent Roy 4

- Cooling: vertical air flow mixed water exchanger Air temperature inside the rack with 2 exchangers: ~ 18 -19 ˚C - Safety aspect (DSS): Thermo switch: 40 ˚C (increase to 60 ˚C possible), Smoke detection, CO 2 automatic triggering. ATCA Crate need to be adapted (by the company? ) to be compatible with vertical air flow. water: 16 ˚C 13 October 2011 Laurent Roy 5

24 Tell 1+L 1 crates location / 8 racks spare in D 2 ‘Detector Extension’ row enough space Air Temperature in Rack (‘Physic mode’): 13 Octobre 2011 Laurent Roy 6

Cooling / power dissipated - Tell 1 crate Velo: 17 Tell 1+2 Hugin power ~820 watts / 865 watts in ‘Physics’ -> total 2 crates = ~ 1. 7 k. W/rack ( Temp inside rack 19˚C ) Other example: TT 16 Tell 1 + 1 Hugin ~645 watts / 705 watts in ‘Physics’ - ATCA crate: maxi 14 boards x 250 W = ~3. 5 k. W ->total 2 crates = ~7. 0 k. W maxi /rack (4 times more !) Tests done in 2002 by PH electronic group (3 exchangers, 3 crates): http: //cdsweb. cern. ch/record/38031/files/epess-2003 -014. pdf Conclusion: “ The air-water rack cooling system developed for LEP and used for the measurements in this report can cope with a total power dissipation of the order of 10 k. W with less than 2% power loss to the surroundings. This corresponds to a useful power dissipation per subrack of 2. 3 k. W. In these conditions most of the electronics is below 40 ˚C ” = total 6. 9 k. W for 3 crates Cooling in place should be Ok (but 40˚C inside? ) , maybe a third exchanger need to be installed, need to be check more in detail, tests ? … 13 Octobre 2011 Laurent Roy 7

General power summary Total Electrical power: (Level 1+LV+HV+…) 70 k. W Heat removed by water: Temp input: 16 ˚C Temp output: ~ +0. 5 ˚C Flow ~ 60 m 3/h ~ 35 k. W Rack Temp inside: 18 -19 ˚C Heat ‘lost’ in room removed by air conditioning units Air temperature in the rooms: ~ 20. 5 ˚C ~ few k. W (D 3 A unit capacity: 26 k. W maximum) (D 3 B unit capacity: 32 k. W maximum) Dissipation in detector side ~ 30 k. W ? 13 Octobre 2011 Laurent Roy 8

General power summary Total Electrical power: (Level 1+LV+HV+…) 70 k. W Heat removed by water: Temp input: 16 ˚C Temp output: ~ +0. 5 ˚C Flow ~ 60 m 3/h ~ 35 k. W (+ 30 -70 k. W with ACTA) Rack Temp inside: 18 -19 ˚C Heat ‘lost’ in room removed by air conditioning units Air temperature in the rooms: ~ 20. 5 ˚C ~ few k. W (few additional) Remove L 1 crates ~ -12 k. W Add ATCA crates ~ +40 -80 k. W ? (depend on boards quantity) Total ~ 30 -70 k. W ? additional (D 3 A unit capacity: 26 k. W maximum) (D 3 B unit capacity: 32 k. W maximum) Dissipation in detector side ~ 30 k. W ? Maxi ~ 105 k. W need to be removed with water = output + 1. 5 ˚C (instead of 0. 5 ˚C) Ok with general cooling (ex. + 4˚C for PC farm in ‘Physics mode’) 13 Octobre 2011 Laurent Roy 9

CONCLUSION: - ATCA crate 19 ’’ dimensions compatible with Rack used few mechanical adaptation needed 13 U instead of 11 U - General electrical distribution already in place enough - Maximum breaker in place 16 A (but could be changed if needed) - Crate should be adapted for vertical air cooling - Heating power to be evacuated per rack ~ 4 times more / current L 1 rack need to be check with more detail (boards quantity/crate) installation of additional 2 U exchanger ? - General cooling power enough - Rk: cabling arrangement should be also taken into account early 13 Octobre 2011 Laurent Roy 10

spare slide 13 Octobre 2011 Laurent Roy 11