Green buildings matter

Green buildings matter

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  Green Buildings Matter- Dothem correctly! Performance of a Rated Building
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  Life Cycle Perspective Materialacquisition Manufacturing Construction Operation Reuse/recycle deconstruction Green buildings are environmentally responsible through their life cycle- design, construction, and operation & after deconstruction. Energy efficiency, though a significant aspect of any green building, is not the only determining factor of a green building
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  GRIHA Strategies Energy Efficiency GRIHA Site Development Solid Waste Manageme nt Water &Waste Management Materials GRIHA evaluates environmental performance from a whole building perspective over a building’s life cycle, providing a definitive standard for what constitutes a ‘green building’.
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  Energy performance index(EPI) is total energy consumed in a building over a year divided by total built up area in kWh/sq m/year and is considered as the simplest and most relevant indicator for qualifying a building as energy efficient or not. The Star rating program of the Bureau of Energy Efficiency rates a building based on its EPI and thus, energy efficiency only. While a green building rating system such as GRIHA rates a building on many indicators in the holistic definition of green buildings. Building Energy Efficiency
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  What is GRIHA •A rating system that was developed by TERI and MNRE to provide a guiding and performance oriented system where points are earned for meeting the design and performance intent of the criteria. • Promotes integrated, whole-building design practices. • It is developed based on Indian needs.
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  Why was GRIHA created? GRIHAwas created to: • quantify aspects such as energy consumption, waste generation, etc., to manage, control and optimise the same to the best possible extent. • promote integrated whole-building design practices. • raise awareness about green building benefits. • transform the building market.
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  To ensure thatall commitments are made on paper are implemented on site, GRIHA’s team conducts three handholding site visits. The first principle of a green building is proper design and installation of the building systems.
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  • Performance ofa building through its life depends on its operation and maintenance. • The building needs to be operated as designed to perform as intended. • For example, if the user of a building (which incorporates day lighting) uses artificial lights, the desired savings will not be achieved.
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  • Performance monitoringis a key strength and differentiation for GRIHA. • No building is given final rating, till it performs to be efficient and effective. • To support this policy, TERI recently conducted a study of energy performance of a few GRIHA rated buildings.
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  Case Study: Fortis Hospital,Shalimar Bagh • It is a 3 star GRIHA rated building. • It has an operating energy performance of 157 kwh/m 2/year (HVAC & lighting energy). • It is significantly better than its initially calculated energy performance. • Energy performance (EPI) of a building gets calculated using a special software for energy stimulation. • The assumptions on equipment efficiency, occupancy, weather and several other parameters determine the predicted/calculated energy performance. • The actual energy performance , when the building starts functioning, may have significant variation from the simulated performance due to climate variability, actual occupancy, operating efficiency of equipment, hours of operation, etc.
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  • It isvery important that measured data is critically evaluated to ensure that the building is performing as intended. • GRIHA has embraced this within its system and, proving performance of a provisionally rated building is the only way to get final rating under GRIHA.
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  Understanding of EPI •EPI varies significantly with varying number of people, internal loads, percentage of air-conditioned space, surface to volume ratios and various other parameters. • The TERI-GRIHA 2 star rated corporate headquarters of a multinational company in Mumbai has been analyzed for giving a sense of the variation. • The current EPI of the building as determined under GRIHA is 120 kWh/m 2/annum . The building has an occupant density of 37m 2/person and equipment power density (EPD)8.8W/m 2. • if the building was densely occupied say to be occupied @ 8m 2/person and had an EPD of 25W/m 2 the consumption would have been 140 kWh/m 2/annum, about 15% higher than present level. • Thus, EPI has to be contextualized and put in right perspective.
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  Conclusion • Energy performanceindex, that is determined by total energy consumed upon total built up area should be understood in the right context and is not the only determinant of a green building. • Operation and maintenance is critical for maintaining “greenness”. • Buildings undergoing green rating should be monitored through construction and operation. • All green parameters should be monitored and performance should be judged based on holistic performance. • Large construction projects undergoing environmental clearance are required to incorporate most of the green/sustainability parameters as required by green building rating systems.
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  THANK YOU