1. Energy performance of Indian Commercial buildings

2. What is energy performance index for commercial buildings
Outline
What is energy performance index for commercial buildings
Commercial building energy performance
ECO-III Benchmarking study
IGBC rated buildings
BEE star rated buildings
EPI, AAhEPI
BAU ~800, 50, ~100

3. What is energy performance index for commercial buildings
Renewable electricity  
Grid Electricity
Total electricity
Main Meter 
DG Electricity
Built-up area (m2)
Built-up area includes all covered area excluding open courtyards, shafts
Energy Performance Index (EPI) (kWh/m2.y) = Annual Grid Electricity + Annual DG Electricity Built−up area
Source: BEE Star rating for Office Building & BEE Star rating for BPO

4. EPI of Commercial Building (2011)
378
349
Multi Specialty Hospitals (378)
Three Shift Office Buildings (349)
279
258
252
4 & 5 Star Hotels (279)
Shopping Malls (252)
149
141
One Shift Office Buildings (149)
Inclues ~800 building, mostly with no rating, example for office 88
115
Source: ECO-III Study on “Energy use in commercial buildings – National benchmarking study” (2011)

5. EPI of Office Buildings
Circle on 50-80
Sources:
- ECO-III Benchmarking study
- IGBC rated buildings
- BEE star rated buildings

6. BEE Star Rating for office building
180
155
130
105 80
Other climate zones, for GiFT city, >50% conditioned area

7. EPI of IGBC rated office buildings
Do not qualify for BEE star rating
Do not get good BEE star rating
Building data up to

8. Examples of Energy efficient office building

9. Institute of Rural Research and Development (IRRAD), Gurgaon
Day-use office building
Built-up area: 7069 m2
EPI: 48 kWh/m2.y
Sehgal Foundation, 2 phases 2008, 2012 half- area
External Shading
Courtyards for daylight
Wall insulation
Roof insulation
Radiant cooling system (Phase-II)
Underfloor displacement ventilation, VRV system, use of VFD (Phase-I)
Source: Ashok B Lall Architects

10. Infosys, SDB 1, Pocharan Campus, Hyderabad
Shading, EE glazing, daylight integration, insulation, Slab cooling, state-of-art control BMS
Day-use office building
Built-up area: 11,600 m2
EPI: 86 kWh/m2.y
Source: Infosys ( data)

11. Infosys Journey towards Energy Efficiency
Less than half in 5 years, average of office buildings, more than half
Design load, good glazing, dimmers, sensors, operational is even low
Achieved due to reduction in loads
Include chiller plant load, EE in equipment
Source: Infosys

12. BPO Buildings

13. Performance indicator for BPO
Annual Average hourly Energy Performance Index (AAhEPI) (Wh/h.m2)
AAhEPI (Wh/h.m2) = EPI (kWh/m2.y) x Annual hours of operation
Example of working hours 5 days x 8 hrs/day vs 6 days x 10 hrs/day

14. BEE Star Rating for BPO building35 30 25 20 15
For all climate except cold, more than 50%

15. Performance of BEE Star BPO Buildings & IGBC rated Tech Parks
Do not qualify for BEE star rating
Range, >100
Source: BEE Star rating of BPO buildings (2011 data) & IGBC rating for Tech Parks (2012 data)

16. Need for absolute benchmarking for energy performance
Summing up
Green rating may not be sufficient to ensure energy efficiency in the buildings
Need for absolute benchmarking for energy performance
Type of building
Performance indicator (AAhEPI OR EPI)
Start with high energy performance benchmarks (e.g. BEE 5-star rating OR best energy efficient buildings)

17. THANK YOU !