Outline. CC objectives Site and building description Typical data floor overview CC measures Results Lessons learned

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Marjorie Sharp
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2 Outline CC objectives Site and building description ypical data floor overview CC measures Results Lessons learned 2

3 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

4 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) Bldg #2 Electricity (kwh) ,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

5 Building #2 Description Primarily a data center facility ~688,000 ft 2 Basement, concourse, and 14 above grade floors loors 2-7, 9, 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, s (130 hp) Administrative space ypical floor: (1) overhead unit serving terminal units 5

6 Data Center ypical HVAC Layout LAN/WAN ** Value from a previous study * 6000 * 14512** 6000 * ** * Design flowrate not measured flowrate ** Value from a previous study * Design flowrate not measured flowrate * in.wg * 1 6 ENCLOSED AREA in. wg DAA & ELEPHONE EQUIPMEN ROOMS X Air from overhead duct discharged under raised floor refer to table X xx.x discharging air into overhead duct Column mounted BAS temperature sensor 3-X discharging air directly under the raised floor x.xxx Under raised floor static pressure 3-8 serving ceiling mounted VAV boxes and PU IGURE LEVEL 3 AIR DISRIBUION, UNDER LOOR SAIC PRESSURES & SPACE EMPERAURES xx.x Overhead duct Ductwork connecting overhead duct with underfloor discharge VAV DDC controller space temperatue

7 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

8 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

9 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, in.wg in. wg ZONE 1 24,322 ZONE 2 43,389 ZONE 3 82,377 ZONE 4 22,688 DAA & ELEPHONE EQUIPMEN ROOMS ,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

10 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

11 Results Electricity 225, Montly Daily Average ELEC Use (kwh/day) 200, , , ,000 Pre CC Baseline Implementation Phase 1 Post CC PDU Load (kwh/day) Whole Building (kwh/day) Outside emperature (Deg) 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

12 Results Chilled Water Montly Daily Average SCHWP ELEC Use (kwh/day) 2,500 2,000 1,500 1, Sensors calibrated Pre CC Baseline Implementation Phase 1 Unreliable trend data SCHWP ELEC (kwh/day) CHWS emp (Deg) CHWR emp (Deg) Post CC 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

13 Results Chilled Water Data Center - Chilled Water low and emperature emperature ( ) ,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, Mar-10 1-Apr-10 8-Apr Apr Apr Apr-10 6-May May May May-10 3-Jun Jun Jun Jun-10 1-Jul-10 8-Jul Jul Jul Jul-10 5-Aug Aug Aug Aug-10 Date OA emp ( ) CHLW ( ) CHLW low (gpm) 13

14 Air Side Results 1,200 Data Center - Electric Service #3 Peak kw and an kw 1, kw 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

15 Results Increased plant CHW approximately 1 Chiller efficiency improvement: 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, Savings kwh (6 months) 2011 Savings (%) (6 months) 1,545,095 21% Combined Savings: ~$223,000 Anticipated Payback: <2 years 15

16 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

17 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

18 Questions? John Hatcher, MBA, PE, CPMP, LEED AP Command Commissioning, LLC 18

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