ATCA Crate / Infrastructure in place

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

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 (9U2U Fan) x 19 x 72cm
• ATCA crate (ex ELMA catalogue)
• ? dimensions OK, few mechanical adaptation (26U
  instead of 22U used for 2 crates).

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)
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
• -gt input (80) 3.5 kW maxi 16A
• ? 16A circuit breaker should be Ok (to be check
  with the manufacturers)

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.
• 
  
  
  
• water16 C

6
24 Tell1L1 crates location / 8 racks spare in
D2 Detector Extension row ? enough space Air
Temperature in Rack (Physic mode)
7

• Cooling / power dissipated
• Tell1 crate
• Velo 17 Tell12 Hugin power 820 watts / 865
  watts in Physics
• -gt total 2 crates 1.7kW/rack ( Temp inside
  rack 19C )
• Other example TT 16 Tell1 1 Hugin 645 watts
  / 705 watts in Physics
• ATCA crate maxi 14 boards x 250W 3.5 kW
• -gttotal 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-200
  3-014.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 40C
  inside?) , maybe a third exchanger need to be
  installed, need to be check more in detail, tests
  ?

total 6.9 kW for 3 crates
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 (Level1LVHV) 70 kW
Rack Temp inside 18-19 C
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 (Level1LVHV) 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. 4C for PC farm in
Physics mode)
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

11
spare slide