Wally phelps adaptiv_cool

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Wally phelps adaptiv_cool

  1. 1. Contained Aisle Pressure Management Rocklin, CA site Feb 24, 2012 www.AdaptivCOOL.com wally.phelps@adaptivcool.com
  2. 2. BackgroundProduct Concept• Understood implications of cold aisle containment on servers• Developed sensor, control algorithms and performed in-house lab tests mid 2011Client site Rocklin, CA• Legacy Site with meat locker type cold aisle containment recently added• Approx 97% contained - still ~3% leakage, especially at roof fire safety mechanism• Typical underfloor obstructions• DX cooling N+2 redundancy• Negative pressure in some aisles, curtains bowing inwards• CRAC setpoints not able to be safely optimized• During CRAC maintenance some severe overheating (Even at N+1)CEETHERM Collaboration• Nov 2011, live testing of “Aisle Pressure Management” concept• Cooperative spirit = rapid development and test cyclesCustomer Implementation• Jan 23 thru Feb 3 2012 www.AdaptivCOOL.com
  3. 3. Aisle Pressure Management concept Control cold aisle pressure to be “slightly positive”, regardless of underfloor distribution issues using network of sensors and active fan tiles. www.AdaptivCOOL.com
  4. 4. Client Data Center Underutilized CRAC Critical CRAC Critical CRAC11 contained cold aisles Underutilized CRACSome aisles critical due to IT load,underfloor distribution and proximity to CRACs www.AdaptivCOOL.com
  5. 5. Implementation Δp Aisle Pressure Sensor 01 10 30 02 01 50 Δp 03 31 Fan Tile 1200CFM Max 05 04 11 02 32 06 Δp 33 Contained Cold Aisle 12 Δp 06 Δp 15 (by customer) 60 03 Δp 16 07 08 04 Δp 40 17 13 09 Δp 05 Δp Under Floor Pressure 42 18 14 10 Sensor (reference only) 19 36 51 43 Δp 20 Δp 37 Δp 34 98 top of rack temperature Δp 21 38 Δp 50 44 22 35 sensors (reference only) 45 23 39 24 underfloor temperature 45kW IT 40kW IT sensors (reference only) CRACs fully instrumented (reference only) Higher density aisles www.AdaptivCOOL.com use more fan tiles
  6. 6. Pressure Management Results Example of 2 aisles Aisle Pressure Management during various CRAC Failures 100 0.014Fan Tile Speed % Aisle 14A Speed 90 0.012 80 0.010 Asile 12A Speed 70 0.008 60 0.006 UnderFloor Pressure Pressure "wc 50 0.004 Aisle 14A Pressure 40 0.002 30 0.000 Aisle 12A Pressure 2015 hours elapsed test time 3 minute sampling -0.002 moving average of 8 samples Aisle Pressure Control set to 0.002”wc www.AdaptivCOOL.com
  7. 7. Findings• Average of 5ºF reduction in top of rack temperatures after install• CRAC failure/maintenance fully robust, location independent• Run site normally at N+1 instead of N+2. N is possible• All curtains bowed out, visual indication of positive pressure• Top of rack temperatures held within +2ºF of underfloor temperatures• CRAC setpoints now raised +5ºF to 85-86ºF. • @50% DX cooling - underfloor = 75ºF top of racks = 77ºF• Moved humidification sensors to cold aisle. 40%RH = 22%RH at CRACs www.AdaptivCOOL.com
  8. 8. Further Study• Move CRAC temperature control to underfloor• Test N or N-1 redundancy performance • CEETHERM testing indicated fan tiles increase CRAC flow• Higher CFM fan tiles, Current Tiles limited to 10KW IT load per tile www.AdaptivCOOL.com
  9. 9. Questions? Thank You! Wally Phelps Director of Engineering AdaptivCool 18 Meadowbrook Drive Milford, NH 03055 wally.phelps@adaptivcool.com (603)913-3453 www.AdaptivCOOL.com

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