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Energy Efficiency @ Infosys. The context…. Our Carbon Footprint. Misc . (13 million units) 5%. Air conditioning (106 million units) 40%. Mobility 34%. UPS (106 million units) 40%. Electricity 66%. Electricity . Employee commute 24%. Lighting / Raw power (40 million units)

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Energy Efficiency @ Infosys

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Presentation Transcript
our carbon footprint
Our Carbon Footprint


(13 million units)


Air conditioning

(106 million units)





(106 million units)





Employee commute


Lighting / Raw power

(40 million units)


Business travel



measure monitor control
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
energy efficiency in hvac
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

energy efficiency in hvac1
Energy Efficiency in HVAC

Existing Chiller plant details :


4 X 250 TR = 1000TR

Auxiliary Connected load : 298 KW

Primary Pumps : 5 No’s

Secondary Pumps : 4 no’s

Condenser Pumps : 5 No’s

CT fans : 4 no’s

Re-engineered Chiller plant details :


4 X 250 TR = 1000TR

Auxiliary Connected load : 88 KW

Primary Pumps : 4 No’s

Condenser Pumps : 4 No’s

CT fans with VFD : 4 no’s

Chiller plant re-engineering – a case study

energy efficiency in lighting
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)

impact of energy efficiency initiatives to the bottom line
Impact of Energy Efficiency Initiatives to the bottom line

Increased by 18%

23% improvement

Energy consumption for 2011-12 is estimated at 205 units/emp/month

integrated design approach
Integrated design approach

Efficient building design

Efficient lighting

Efficient air conditioning

Efficient control system for operation

ECBC as the baseline

day lighting in buildings trivandrum
Day Lighting in Buildings: Trivandrum

Trivandrum SDB 1 building with high performance glazing shaded externally

Artificial lights are not required during daytime.

8x saving in operations cost trivandrum sdb 1
8X saving in operations cost– Trivandrum SDB 1

Simulations for optimization

LED replacing CFLs

Day lighting sensors

300 improvement in lighting design
300% improvement in Lighting design

2X reduction in the installed lighting load

~3X reduction in lighting energy consumption

hvac design optimization process
HVAC Design optimization process


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
heat loads heat sources
Heat loads – Heat Sources


Fresh air




24 0C






35 0C

building envelope insulation
Building Envelope: Insulation

Wall (5X)

Roof (13X)

RCC roof

45 0C

24 0C

35 0C

Plain Brick wall

24 0C

55 Watts

24 0C

35 0C

22 Watts

Insulated RCC roof

4.4 Watts

35 0C

Double brick wall with insulation

24 0C

4 Watts

building envelope high performance glazing 5 8 x
Building Envelope: High Performance glazing (5.8 X)



Far Infra Red

Near Infra Red

Near Infrared

Far Infrared








50 microns

Spectrally selective double wall glass with Argon filling

Single glass

900 W

900 W

24 0C

35 0C

24 0C

810 W

360 W

540 W

90 W

35 0C

55 W

12 W

advanced cooling technologies
Advanced Cooling Technologies

Specific heat of water

4.2 kJ/kg deg K

Density of water

1000 kg/m3

Specific heat of air

1.0 kJ/kg deg K

Density of air

1.25 kg/m3

Water can store 3,400 times more thermal energy per unit volume than air!

Water Vs Air as heat transfer medium

66 energy savings alternative cooling strategies
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





Double brick wall with insulation

24 0C

35 0C

4.4 Watts

Radiant cooling pipes embedded in the slabs

smart buildings actual data

Design Vs Actual Efficiencies

Smart buildings – actual data

Design Vs Actual Efficiencies


300 improvement in air conditioning design
300%Improvement in air-conditioning design
  • Figures based on actual measured data in Hyderabad climate for Apr 2011 – Feb 2012
  • 3X improvement in efficiency compared to 2007 design
  • Radiant cooling at no additional cost
green building certifications
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

redefining the standards
Redefining the standards

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

experiences conclusions
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.

thank you
Thank you

Guruprakash Sastry

Senior Manager – Green Initiatives | Infrastructure

Infosys Limited

Bangalore 560 100

Tel: +91 80 39148650

M: +91 97399 76191