Energy Performance Index

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Introduction

EPI or Energy Performance Index indicates the specific energy usage of a building. It is basically the ratio of total energy used to the total built-up area. This total energy used includes both purchased electricity as well as that generated on-site, but excludes renewable sources like solar photovoltaic etc. The total built-up area excludes basement and parking areas.


Brief Description

EPI is calculated after completion of one year of operation with full occupancy of the building and is measured in units of kWh/sq m/year.


For BEE Star rating, the bandwidths for Energy Performance Index for different climate zones have been developed based on percentage air-conditioned space. For example a building in a composite climatic zone like New Delhi and having air conditioned area greater than 50% of their built up area, the bandwidths of EPI range between 190-90 kWh/sq m/year. Thus a building would get a 5-Star rating if its EPI falls below 90kWh/sq m/year and 1 Star if it is between 165-190 90kWh/sq m/year.


Similarly the same building in a warm and humid climate zone like Chennai, the bandwidths of EPI range between 200-100 kWh/sq m/year and therefore it would get a 5-Star rating if its EPI is below 100 kWh/sq m/year and 1 Star if it is between 200-175 kWh/sq m/year.


Buildings having air conditioned area less than 50% of their built up area, in a composite climate zone the bandwidths of EPI range between 80-40 kWh/sq m/year. Similarly the same building in a warm and humid climatic zone like Chennai, the bandwidths of EPI range between 85-45 kWh/sq m/year, and in a hot and dry climate like Jodhpur, the bandwidths of EPI range between 75-35 kWh/sq m/year.


References:

http://www.emt-india.net/ECBC/main.htm

http://www.glassisgreen.com/papers/ECBC%20Mumbai/9th%20April,2009.pdf

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