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Overview of Rack Infrastructure for ATCA Crates in D3

This document presents a comprehensive analysis of the infrastructure necessary for the installation of ATCA crates in D3, focusing on rack dimensions, electrical power availability, cooling requirements, and safety aspects. Key measurements include rack dimensions (2m54 x 60 cm x 90 cm) and optimum electrical power distribution designed for 11 kW/rack. The report also addresses temperature control within the racks, with cooling provided through a vertical air flow system and mixed water exchangers. Conclusions emphasize the need for minor mechanical adaptations and further assessments for efficient operation.

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Overview of Rack Infrastructure for ATCA Crates in D3

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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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