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ATCA Crate / Infrastructure in place Rack in D3: dimension Electrical power availability

ATCA Crate / Infrastructure in place Rack in D3: dimension Electrical power availability Tell1 racks running in D3 (air ventilation, safety aspect) Temperatures, power of crates in D3 Conclusion. Rack in D3 dimensions: 2m54 x 60 cm x 90 cm Useful space :

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ATCA Crate / Infrastructure in place Rack in D3: dimension Electrical power availability

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  1. ATCA Crate / Infrastructure in place • Rack in D3: dimension • Electrical power availability • Tell1 racks running in D3 (air ventilation, safety aspect) • Temperatures, power of crates in D3 • Conclusion Laurent Roy

  2. Rack in D3 dimensions: 2m54 x 60 cm x 90 cm • Useful space : • height 56U (2m49) ~10U need to be free at the bottom for cabling and water valve access. • width 19’’ (48,3cm) • depth ~73cm • Level1 crates : 11U (9U+2U Fan) x 19” x ~72cm • ATCA crate (ex: ELMA catalogue) •  dimensions OK, few mechanical adaptation (26U instead of 22U used for 2 crates). Laurent Roy

  3. Electrical Power for Frond End racks in D3 Maximum available: ~ 410 kW Consumption total: ~ 70 kW (in ‘Physics’ mode)  No problem with ‘general power’ (17% of the capacity used) Laurent Roy

  4. Electrical power available per rack • distribution designed for 11 kW/rack max. • 16 A circuit breakers (Merlin Gerin C60H – D16A). • 7 single phase power outlets available (burndy connector). • ATCA crate consumption: • ?? • ex. ELMA catalogue: Output PSU 2799 watt maxi • -> input (80%) ~ 3.5 kW maxi = ~ 16A •  16A circuit breaker should be Ok (to be check with the manufacturers) Laurent Roy

  5. 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, CO2 automatic triggering. • ATCA Crate need to be adapted (by the company?) to be compatible with vertical air flow. • water:16 ˚C Laurent Roy

  6. 24 Tell1+L1 crates location / 8 racks spare in D2 ‘Detector Extension’ row  enough space Air Temperature in Rack (‘Physic mode’): Laurent Roy

  7. Cooling / power dissipated • Tell1 crate • Velo: 17 Tell1+2 Hugin power ~820 watts / 865 watts in ‘Physics’ • -> total 2 crates = ~ 1.7kW/rack ( Temp inside rack 19˚C ) • Other example: TT 16 Tell1 + 1 Hugin ~645 watts / 705 watts in ‘Physics’ • ATCA crate: maxi 14 boards x 250W = ~3.5 kW • ->total 2 crates = ~7.0 kW 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 10kW with less than 2% power loss to the surroundings. This corresponds to a useful power dissipation per subrack of 2.3kW. In these conditions most of the electronics is below 40 ˚C ” •  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 ? … = total 6.9 kW for 3 crates Laurent Roy

  8. General power summary Heat removed by water: Temp input: 16 ˚C Temp output: ~ +0.5 ˚C Flow ~ 60m3/h  ~ 35kW Heat ‘lost’ in room removed by air conditioning units Air temperature in the rooms: ~20.5 ˚C ~ few kW (D3A unit capacity: 26kW maximum) (D3B unit capacity: 32 kW maximum) Dissipation in detector side ~ 30kW ? Total Electrical power: (Level1+LV+HV+…) 70 kW Rack Temp inside: 18-19 ˚C Laurent Roy

  9. General power summary Heat removed by water: Temp input: 16 ˚C Temp output: ~ +0.5 ˚C Flow ~ 60m3/h  ~ 35kW (+ 30-70 kW with ACTA) Heat ‘lost’ in room removed by air conditioning units Air temperature in the rooms: ~20.5 ˚C ~ few kW (few additional) (D3A unit capacity: 26kW maximum) (D3B unit capacity: 32 kW maximum) Dissipation in detector side ~ 30kW ? Total Electrical power: (Level1+LV+HV+…) 70 kW Rack Temp inside: 18-19 ˚C Remove L1 crates ~ -12kW Add ATCA crates ~ +40-80kW ? (depend on boards quantity) Total ~ 30-70 kW ? additional Maxi ~ 105kW 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’) Laurent Roy

  10. CONCLUSION: • ATCA crate 19 ’’ dimensions compatible with Rack used • few mechanical adaptation needed 13U instead of 11U • General electrical distribution already in place enough • Maximum breaker in place 16A (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 L1 rack  need to be check with more detail (boards quantity/crate) • installation of additional 2U exchanger ? • General cooling power enough • Rk: cabling arrangement should be also taken into account early Laurent Roy

  11. spare slide Laurent Roy

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