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Energy Infosys The context… 1,30,000 employees Total built-up space of Infosys, India at the end of 2010-11 28 million sq.ft. Annual electricity.

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Presentation on theme: "Energy Infosys The context… 1,30,000 employees Total built-up space of Infosys, India at the end of 2010-11 28 million sq.ft. Annual electricity."— Presentation transcript:


2 Energy Infosys

3 The context… 1,30,000 employees Total built-up space of Infosys, India at the end of million sq.ft. Annual electricity Infosys, India in crore units Consumption per working Infosys, India in lakh units 3

4 Our Carbon Footprint Mobility 34% Electricity 66% Air conditioning (106 million units) 40% Lighting / Raw power (40 million units) 15% UPS (106 million units) 40% Misc. (13 million units) 5% Employee commute 24% Business travel 76% Electricity Mobility 4

5 Existing buildings 5

6 Measure, Monitor & Control You cannot control what you cannot measure ! Installed over 1500 energy meters starting from 2008 to measure energy consumption of various energy consumption categories Building incoming feeder Chiller plant main panel, and further sub metering Lighting/raw power panel This was the starting point for energy efficiency measures in existing buildings 6

7 Monitoring energy consumption 7

8 8

9 Initiated Audits 9

10 Actual consumptions versus design assumptions 10

11 10% overall Savings 11

12 12

13 Energy consumption profile on a weekday 13

14 Energy consumption profile on a weekend 14

15 Energy efficiency in HVAC Energy audits were initiated Consolidated on the operating hours across locations Defined operating patterns of equipments Replacement of old equipments with poor efficiencies Chiller plant re-engineering to get them to highest efficiency standards Daily energy reports to the facility managers 15

16 Question all the assumptions 16

17 Energy Efficiency in HVAC Chiller plant re-engineering – a case study Existing Chiller plant details : Chillers: 4 X 250 TR = 1000TR Auxiliary Connected load : 298 KW Primary Pumps : 5 Nos Secondary Pumps : 4 nos Condenser Pumps : 5 Nos CT fans : 4 nos Re-engineered Chiller plant details : Chillers: 4 X 250 TR = 1000TR Auxiliary Connected load : 88 KW Primary Pumps : 4 Nos Condenser Pumps : 4 Nos CT fans with VFD : 4 nos 17

18 Energy Efficiency in HVAC LocationExisting chillers Current efficiencyProposed replacement Proposed efficiency Pune175 TR x kW/TR 200 TR x kW/TR Chennai450 TR x TR x TR x kW/TR450 TR x kW/TR Mangalore250 TR x 30.8 kW/TR250 TR x kW/TR Bangalore150 TR x TR x kW/TR180 TR x kW/TR 18

19 Energy Efficiency in HVAC 19 LocationRe-engineering projectsStatus Load Reduction in KW Bangalore Park 1, 2, 3Park 1,2 & 3 re-engineering completed. 542 Park 6VPF conversion completed 74 Hyderabad Phase 1Pumps replacement and re-engineering completed 115 Phase 2Pumps replacement and re-engineering completed 180 Phase 2condenser pumps completed 90 Mysore Single unit96 AC units replaced. 77 GEC1 Re-engineering completed, pumps installation is completed & VFD commission is in progress. 210 Chennai SholsCondenser pumps completed 54 SholsChilled water pumps completed 199 Ph-2 ECC ECC condenser pumps installation completed 178 ECC chilled water pumps installation completed 216 MangaloreNethra campusChilled water pumps installation completed 130 Total Connected Load Reduction 2065

20 Energy Efficiency in Lighting Occupancy sensors in rest rooms, cabins LED lights in WCs (replacing CFL) LED street lights (replacing HPSV) Lighting energy savers on the panels Astronomical timers for street lighting LEDs for corridor lighting (replacing CFL) 20

21 Impact of Energy Efficiency Initiatives to the bottom line Increased by 18% 23% improvement Energy consumption for is estimated at 205 units/emp/month 21

22 New buildings – A new approach 22

23 Integrated design approach Efficient building design Efficient lighting Efficient air conditioning Efficient control system for operation ECBC as the baseline 23

24 Day Lighting in Buildings: Trivandrum Artificial lights are not required during daytime. Trivandrum SDB 1 building with high performance glazing shaded externally 24

25 8X saving in operations cost– Trivandrum SDB 1 Simulations for optimization Day lighting sensors LED replacing CFLs 25

26 300% improvement in Lighting design 2X reduction in the installed lighting load ~3X reduction in lighting energy consumption 26

27 HVAC Design optimization process Goal To maximize energy efficiency in building HVAC system through design interventions Step 1 Prevent heat coming into the building as much as possible Step 2 Design efficient system to maximize energy efficiency Step 3 Select high efficiency equipments to further maximize energy efficiency 27

28 Heat loads – Heat Sources 35 0 C 24 0 C Roof Walls Glass Lights Fresh air Equipment People

29 Building Envelope: Insulation 35 0 C 24 0 C 22 Watts 35 0 C 24 0 C 4.4 Watts 45 0 C 24 0 C 55 Watts 35 0 C 24 0 C 4 Watts Plain Brick wall Double brick wall with insulation RCC roof Insulated RCC roof Wall (5X) Roof (13X) 29

30 Building Envelope: High Performance glazing (5.8 X) UVVisible Far Infra Red Near Infra Red microns SolarThermal 2.1 Near InfraredFar Infrared 35 0 C 24 0 C 900 W 540 W 360 W 55 W 35 0 C 24 0 C 900 W 90 W 810 W 12 W Single glassSpectrally selective double wall glass with Argon filling 30

31 Case Study: Building in Mysore (1.8 X) Sl. No. CaseChiller capacity required (TR) Annual energy consumption (kWh) Maximum electrical load (kW) 1Conventional building envelope 6223,244,2841,052 2Efficient building envelope Efficient lighting design Efficient computers Variable Air Volume system for AC Heat Recovery Wheels for AC Ultra high efficiency chiller Efficient chilled water system design High efficiency cooling tower Lighting controls4001,775, No additional cost

32 Water Vs Air as heat transfer medium Advanced Cooling Technologies Water can store 3,400 times more thermal energy per unit volume than air! Specific heat of water 4.2 kJ/kg deg K Density of water 1000 kg/m 3 Specific heat of air 1.0 kJ/kg deg K Density of air 1.25 kg/m 3 32

33 66% energy savings: Alternative cooling strategies Highly insulated building Evaporative cooling Heat recovery wheel/Free Cooling Radiant cooling/Chilled beams Building management software Very efficient equipments Radiant cooling pipes embedded in the slabs 35 0 C 24 0 C 4.4 Watts Double brick wall with insulation Outside inside 200 mm 150 mm 33

34 Design Vs Actual Efficiencies Benchmarking Design Vs Actual Efficiencies Smart buildings – actual data 34

35 Smart buildings – actual data 35

36 >200% improvement in overall energy efficiency of new SDBs 36

37 300% Improvement in air-conditioning design Figures based on actual measured data in Hyderabad climate for Apr 2011 – Feb X improvement in efficiency compared to 2007 design Radiant cooling at no additional cost 37

38 Green Building Certifications LEED Platinum rating for BPO-1, Jaipur LEED Platinum rating for SDB-1, Trivandrum LEED Platinum rating for SDB-5, Mysore LEED Platinum rating for SDB-1, Hyderabad BEE 5-star rating for BPO-1, Pune All new buildings of Infosys since 2008 have been registered for Green Building rating – LEED / GRIHA 38

39 Building envelope heat load not to exceed 1.0 W/sqft More than 75% of the office area to be naturally lit as per LEED standards Breaking the barrier………….. > 550 sqft per TR of AC area < 0.4 W/sqft for lighting design < 0.5 kW/TR for chiller plant design < 3.5 W/sqft for electrical design Redefining the standards 39

40 Experiences / Conclusions Set unreasonable targets Efficient buildings do not cost more, but need a little effort at the right time. All Infosys buildings exceed ECBC efficiency requirements. Good design = job half done ! Question all assumptions and get the sizing right Select right sized efficient equipments and smart controls Measure, monitor……..Measure, monitor…………. Seeing is believing……………Welcome to Infosys. 40

41 Thank you Guruprakash Sastry Senior Manager – Green Initiatives | Infrastructure Infosys Limited Bangalore Tel: M:

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