Outline CC objectives Site and building description ypical data floor overview CC measures Results Lessons learned 2
CC Objectives Identify and solve existing operating problems Improve building thermal comfort and indoor air quality Minimize building energy consumption Minimize building energy cost Provide knowledge-based and hands-on training to inhouse facility management staff All of the above without major ECM retrofits 3
Site Description Consists of 4 buildings and central plant ~2.54 million square feet of conditioned space Used 132 million kwh of electricity at a cost of $9.4 million in 2010 Site Electricity (kwh) - 2010 Bldg #2 Electricity (kwh) - 2010 13,230,491, 10% 27,762,955, 21% 2,281,741, 2% 7,455,829, 10% 9,399,798, 12% 11,939,581, 9% 77,079,962, 58% Central Plant Bldg 4 Bldg 1 Bldg 2 Bldg 3 HVAC load includes fans and pumps. Chiller electricity is included in the Central Plant total. 60,224,336, 78% PDU HVAC 4 Lighting & Plug
Building #2 Description Primarily a data center facility ~688,000 ft 2 Basement, concourse, and 14 above grade floors loors 2-7, 9, 10 69 s (1,920 hp) Raised floor data center space ypical floor: (1) overhead unit serving terminal units and (7-9) underfloor units Underfloor supply fans retrofitted with VDs loors 8, 11-14 5 s (130 hp) Administrative space ypical floor: (1) overhead unit serving terminal units 5
Data Center ypical HVAC Layout 30 29 3-1 28 27 3-2 26 24 62.3 LAN/WAN 23 3-4 3-5 ** Value from a previous study 21 20 19 6000 * 6000 * 14512** 6000 * 5077 52867 4804 6438 6566 55929 15478** 5917 5247 5165 5037 1 8 * Design flowrate not measured flowrate ** Value from a previous study 58.7 0.0417 58.1 2 5 6177 0.0261 69.2 4606 2 2 0.0102 * Design flowrate not measured flowrate 82.3 4535* 1 7 0.0215 in.wg 61.8 82.4 4535* 1 6 ENCLOSED AREA 4512 1 5 73.4 67.6 63.6 9 4564 68.3 4984 1 0 77.9 1 4535 0.0378 in. wg 0.0322 0.0219 0.0202 4570 1 4 2 3820 4635 1 3 5217 5805 4945 34272 4553 52915 38999 38394 4646 4325 DAA & ELEPHONE EQUIPMEN ROOMS 6275 3 5 6 8 3-3 4 73.4 X Air from overhead duct discharged under raised floor refer to table 3.1 3-X xx.x discharging air into overhead duct Column mounted BAS temperature sensor 3-X discharging air directly under the raised floor x.xxx 3-9 3-5 Under raised floor static pressure 3-8 serving ceiling mounted VAV boxes and PU IGURE 3.2 - LEVEL 3 AIR DISRIBUION, UNDER LOOR SAIC PRESSURES & SPACE EMPERAURES xx.x 3-7 11 Overhead duct Ductwork connecting overhead duct with underfloor discharge VAV DDC controller space temperatue 12 49413 3-6 6
Data loor Optimization Overview raditional Cx activities Calibrate HVAC sensors unctional testing Low cost retrofits Seal around equipment and cable openings Install curtain walls to improve containment CC measures Implement and verify optimized control sequences Monitor energy savings 7
CC Measures Data loors Implementation Phase 1 CC Measure Baseline Control Current Control Optimize underfloor air distribution Optimize CHW valve control (Underfloor units) Optimize static pressure setpoint control (Underfloor units) Less than optimal (1) tile selection (2) return air grille positioning CHW valve maintained fixed SA setpoint None; VDs commanded to 100%, back-up units offline Replaced perforated tiles and relocated return air grilles CHW valve modulates to maintain SA setpoint which is reset (55-64 ) based on return air temperature (75-82 ) Supply fan VDs modulate to maintain optimized under floor static pressure setpoint 8
Data Center loor HVAC Layout 62.3 LAN/WAN X ZONE 8 18,000 ZONE 7 29,062 ZONE 6 60,535 ZONE 5 30,436 0.0261 0.0417 0.0102 58.7 58.1 69.2 82.3 0.0215 in.wg 61.8 82.4 73.4 67.6 63.6 68.3 77.9 1 0.0378 in. wg 0.0322 0.0219 0.0202 ZONE 1 24,322 ZONE 2 43,389 ZONE 3 82,377 ZONE 4 22,688 DAA & ELEPHONE EQUIPMEN ROOMS 73.4 6,275 UNDER RAISED LOOR AIR LOW AIR LOW ROM OVERHEAD DUC: 149,490 CM AIR LOW DIREC ROM : 167,594 CM OAL AIR LOW: 317,084 CM IGURE 3.2A - LEVEL 3 AIR DISRIBUION, UNDER LOOR SAIC PRESSURES & SPACE EMPERAURES 9
CC Measures Admin loors Implementation Phase 2 CC Measure Baseline Control Proposed Control Optimize static pressure setpoint control Optimize SA setpoint control ixed duct static pressure setpoint (measured 2/3 down the duct) ixed SA setpoint Duct static pressure setpoint reset based on terminal box demand (damper position) SA setpoint reset up when duct static setpoint is at minimum limit for specified time period 10
Results Electricity 225,000 100 Montly Daily Average ELEC Use (kwh/day) 200,000 175,000 150,000 125,000 Pre CC Baseline Implementation Phase 1 Post CC PDU Load (kwh/day) Whole Building (kwh/day) Outside emperature (Deg) 90 80 70 60 50 40 30 20 10 0 Monthly Average Dry-bulb emperature ( ) Jul-09 Aug-09 Sep-09 Oct-09 Nov-09 Dec-09 Jan-10 eb-10 Mar-10 Apr-10 May-10 Jun-10 Jul-10 Aug-10 Sep-10 Oct-10 Nov-10 Dec-10 Jan-11 eb-11 Mar-11 Apr-11 May-11 Jun-11 Jul-11 11
Results Chilled Water Montly Daily Average SCHWP ELEC Use (kwh/day) 2,500 2,000 1,500 1,000 500 Sensors calibrated Pre CC Baseline Implementation Phase 1 Unreliable trend data SCHWP ELEC (kwh/day) CHWS emp (Deg) CHWR emp (Deg) Post CC 70 65 60 55 50 45 Monthly Average CHW emperature ( ) 0 40 Jul-09 Aug-09 Sep-09 Oct-09 Nov-09 Dec-09 Jan-10 eb-10 Mar-10 Apr-10 May-10 Jun-10 Jul-10 Aug-10 Sep-10 Oct-10 Nov-10 Dec-10 Jan-11 eb-11 Mar-11 Apr-11 May-11 Jun-11 Jul-11 12
Results Chilled Water Data Center - Chilled Water low and emperature emperature ( ) 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 6,400 6,300 6,200 6,100 6,000 5,900 5,800 5,700 5,600 5,500 5,400 5,300 GPM 0.0 5,200 25-Mar-10 1-Apr-10 8-Apr-10 15-Apr-10 22-Apr-10 29-Apr-10 6-May-10 13-May-10 20-May-10 27-May-10 3-Jun-10 10-Jun-10 17-Jun-10 24-Jun-10 1-Jul-10 8-Jul-10 15-Jul-10 22-Jul-10 29-Jul-10 5-Aug-10 12-Aug-10 19-Aug-10 26-Aug-10 Date OA emp ( ) CHLW ( ) CHLW low (gpm) 13
Air Side Results 1,200 Data Center - Electric Service #3 Peak kw and an kw 1,000 800 kw 600 400 200 0 Dec-2009 Jan-2010 eb-2010 Mar-2010 Apr-2010 May-2010 Jun-2010 Jul-2010 Aug-2010 Date Optimized an kw Service #3 Peak kw 14
Results Increased plant CHW approximately 1 Chiller efficiency improvement: 0.007 kw/ton (1%) Assumed load: ~3,038 tons Chiller savings: $9,800 (9 months) Oct-10 ~ Jun-11 (9 months) Savings: $213,000 (~3 mil kwh) 2010 HVAC kwh 7,455,829 2011 Savings kwh (6 months) 2011 Savings (%) (6 months) 1,545,095 21% Combined Savings: ~$223,000 Anticipated Payback: <2 years 15
Conclusions It is cost effective to apply the CC process to data center spaces Data center cost savings analysis requires additional metering Calibration of critical sensors related to control and energy monitoring are critical to success of CC process 16
Lessons Learned & uture Plans Importance of calibrating key sensors immediately Oversight of controls contractor and other vendors critical to the success of the project during implementation phase Ambient impact on operations Next steps Optimize secondary chilled water pump control Optimize central plant 17
Questions? John Hatcher, MBA, PE, CPMP, LEED AP Command Commissioning, LLC jhatcher@command-cx.com 18