LEED EBOM certification for credit EAp2 and EAc1: Documentation Aproach

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EA Prerequisite 2 (EAp2): Minimum Energy Efficiency Performance

Intent: “To establish the minimum level of operating energy efficiency performance relative to typical buildings of similar type to reduce environmental and economic impacts associated with excessive energy use”.

The energy use refers to the building uses in terms of fuel consumption or in terms of unit consumption of electricity. If the building is big like commercial or office type then some additional central equipments like chillers, pumps also there for energy consumptions. The energy consumed by chillers and pumps may be generated by the gas or HSD generators which operated by the building own which is used mostly in Indian building sector they set an Energy center within their own premises for their HVAC and electricity uses, or they using the electricity from utility grid, for both the cases it should be used efficiently with inclusion of the concern of environmental impact also, and if it is not then how to make them work efficiently or to make less impact on the environment.

Requirements

CASE 1 : Projects Eligible for Energy Star Rating

  • Achieve an energy performance rating of at least 69 rating using Portfolio Manager.
  • Each building’s energy performance must be based on actual metered energy consumption for the LEED project building(s).
  • 12 months of continuous measured energy data
  • Calibrate meters within the manufacturer’s recommended interval

Here 12 months or a complete year is taken for the observation tenure because, there are several seasonal changes occurs in a year, which affects the building and its load, so to measure it or to account the performance of the building for that changes there is one year duration is taken. When there are two building of same type and same features, there is a huge possibility that they may differ in their performance of energy consumption. In this condition whole one year performance is taken in account to identify the reasons for the difference and lower performances of those buildings.

Meters used for measurement of the building parameters are the only source to represent the building performance. If the meter is not calibrated frequently then it can give a false reading, which can create a wrong estimation of the building performance. For curing this problem meters should be calibrated as it notified by the manufacturers.

CASE 2 : Projects not eligible for Star Ratings

It should be more efficient i.e. 90 % more than similar type of building by doing benchmark analysis of this building by comparing with National Average Source Energy data provided in port folio manager tool.

Or, we should calibrate energy for period of one year and use the data in the port folio manager tool available on Energy Star website to benchmark the project .

Potential Technologies & Strategies

  • Implement energy-efficient retrofits and energy-saving techniques to reduce the building’s energy use.
  • Consider renewable energy options as a way to minimize the building’s environmental impact.

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EA Credit 1(EAc1): Optimize Energy Efficiency Performance

  • Intent: To achieve increasing levels of operating energy performance relative to typical buildings of similar type to reduce environmental and economic impacts associated with excessive energy use.

Here the energy use refers to the building uses in terms of fuel consumption or in terms of units consumption of electricity. If the building is big like commercial or office type then some additional central equipment like chillers also there for HVAC facilitation. They (chillers) may run by the gas or HSD generators which operated by the building own or they using the electricity from utility grid, for both the cases it should be used efficiently with inclusion of the concern of environmental impact also, and if it is not then how to make them work efficiently or to make less impact on the environment.

  • Requirements

CASE 1. Projects Eligible for Energy Star Rating

  • Generate Energy Star Rating report using Energy Portfolio Manager
  • Have energy meters that measure all energy use throughout the performance period of buildings to be certified.
  • Actual metered energy consumption for the LEED project of full 12 months of continuous measured energy data.
  • Calibrate meters within the manufacturer’s recommended interval

Here 12 months or a complete year is taken for the observation tenure because, there are several seasonal changes occurs in a year, which affects the building and its load, so to measure it or to account the performance of the building for that changes there is one year duration is taken. When there are two building of same type and same features, there is a huge possibility that they may differ in their performance of energy consumption. In this condition whole one year performance is taken in account to identify the reasons for the difference and lower performances of those buildings.

Meters used for measurement of the building parameters are the only source to represent the building performance. If the meter is not calibrated frequently then it can give a false reading, which can create a wrong estimation of the building performance. For curing this problem meters should be calibrated as it notified by the manufacturers.

CASE 2 : Projects not eligible for Star Ratings

It should be more efficient i.e. 90 % more than similar type of building by doing benchmark analysis of this building by comparing with National Average Source Energy data provided in port folio manager tool.

Or, we should calibrate energy for period of one year and use the data in the port folio manager tool available on Energy Star website to benchmark the project .

Potential Technologies & Strategies

  • Implement energy-efficient retrofits and energy-saving techniques to reduce the building’s energy use.
  • Consider renewable energy options as a way to minimize the building’s environmental impact.

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Comparison between EAp2 and EAc1 –

S. No. Parameters EAp2 EAc1
1 Intent Establishing minimum energy efficiency performance Optimizing energy efficiency performance
2 Minimum requirement for projects which are eligible for energy star rating Performance rating of 69 is required Performance rating of 71 is required
3 Minimum requirement for projects which are not eligible for energy star ratings Energy efficiency should be of at least 19 % better than average of similar building when it is bench marked using National Source Energy data. Energy efficiency should be of at least 21% better than average of similar building when it is bench marked using National Source Energy data.
4 Calculations Energy and cost indices are calculated Benchmarking of energy usage data is calculated
5 Timeline and Team Whole energy usage analysis is carried out Increases the efficiency levels based on whole year consumption data
6 Energy audit Energy audit walkthrough analysis is mandatory Energy audit walkthrough analysis is not mandatory

By

Sheelam Khare, Gaurav Gupta, Naveen yella

 

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