Understanding Energy Performance Index for Commercial Buildings
Energy Performance Index (EPI) is a key metric used to evaluate the energy efficiency of commercial buildings. It is calculated based on the annual grid electricity consumption, annual DG electricity consumption, and the built-up area of the building. Various studies and ratings such as ECO-III Benchmarking, IGBC ratings, and BEE star ratings provide benchmarks for different types of commercial buildings. The EPI values indicate the energy efficiency levels of buildings, with lower values representing better performance. Additionally, the EPI can help in determining eligibility for BEE star ratings and assess the energy usage of different building types.
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Presentation Transcript
What is energy performance index for commercial buildings Commercial building energy performance ECO-III Benchmarking study IGBC rated buildings BEE star rated buildings
Renewable electricity Grid Total electricity Main Meter Electricity DG Electricity Built-up area (m2) 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
378 Multi Specialty Hospitals (378) 349 Three Shift Office Buildings (349) 279 4 & 5 Star Hotels (279) 258 252 Shopping Malls (252) 149 141 One Shift Office Buildings (149) 88 115 Source: ECO-III Study on Energy use in commercial buildings National benchmarking study (2011)
Sources: - ECO-III Benchmarking study - IGBC rated buildings - BEE star rated buildings
180 155 130 105 80
Do not qualify for BEE star rating Do not get good BEE star rating
Day-use office building Built-up area: 7069 m2 EPI: 48 kWh/m2.y Source: Ashok B Lall Architects
Day-use office building Built-up area: 11,600 m2 EPI: 86 kWh/m2.y Source: Infosys (2011-12 data)
Annual Average hourly Energy Performance Index (AAhEPI) (Wh/h.m2) EPI (kWh/m2.y) x 1000 Annual hours of operation AAhEPI (Wh/h.m2) =
35 30 25 20 15
Do not qualify for BEE star rating Source: BEE Star rating of BPO buildings (2011 data) & IGBC rating for Tech Parks (2012 data)
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)
