Indira Paryavaran Bhawan
Ministry of Environment and Forest (MoEF)

Energy Efficient Design Features


Location New Delhi
Geographical coordinates 28° N, 77° E
Occupancy Type Office (MoEF)
Typology New Construction
Climate Type Composite
Project Area 9,565 m2
Grid Connectivity Grid connected
EPI 44 kWh/m2/yr


Indira Paryavaran Bhawan, the new office building for Ministry of Environment and Forest (MoEF) sets is a radical change from a conventional building design.

The project team put special emphasis on strategies for reducing  energy demand by providing adequate natural light, shading,  landscape to reduce ambient temperature, and energy efficient active building systems. Several energy conservation measures were adopted to reduce the energy loads of the building and the remaining demand was met by producing energy from on-site installed high efficiency solar panels to achieve net zero criteria. Indira Paryavaran Bhawan uses 70% less energy compared a conventional building. The project adopted green building concepts including conservation and optimization of water by recyclingwaste water from the site.

Indira Paryavaran Bhawan is now India’s highest green rated building. The project has received GRIHA 5 Star and LEED Platinum. The building has already won awards such as the Adarsh/GRIHA of MNRE for exemplary demonstration of Integration of Renewable Energy Technologies.

Indira Paryavaran Bhawan
Ministry of Environment and Forest (MoEF)

Passive Design Strategies

  • Orientation: Building is north south oriented, with separate blocks connected through corridors and a huge central court yard. Orientation minimizes heat ingress. Optimal window to wall ratio.
  • Landscaping: More than 50% area outside the building is covered with plantation.Circulation roads and pathways are  soft paved to enable ground water recharge.
  • Daylighting: 75% of building floor space is day lit, thus reducing dependence on artificial sources for lighting. Inner courtyard serves as a light well.
  • Ventilation: Central courtyard helps in air movement as natural ventilation happens due to stack effect. Windows and jaalis add to cross ventilation.
  • Building Envelope and Fenestration:
    • Optimized Building Envelope – Window assembly (U-Value 0.049 W/m2K),VLT 0.59, SHGC 0.32
    • uPVC windows with hermetically sealed double glazed using low heat transmittance index glass
    • Rock wool insulation
    • High efficiency glass
    • Cool roofs: Use of high reflectance terrace tiles for heat ingress, high strength, hard wearing.
  • Materials and construction techniques :
    • AAC blocks with fly ash
    • Fly ash based plaster & mortar
    • Stone and Ferro cement jaalis
    • Local stone flooring
    • Bamboo jute composite doors, frames and flooring
    • High efficiency glass, high VLT, low SHGC & Low U-value, optimized by appropriate shading
    • Light shelves for diffused sunlight

Indira Paryavaran Bhawan
Ministry of Environment and Forest (MoEF)

Active Strategies

Lighting Design

  1. Energy efficient lighting system ( LPD = 5 W/m2) , nearly 50% more efficient than Energy Conservation Building Code 2007 requirements ( LPD = 11 W/m2)  reduces energy demand further.
  2. Remaining lighting load supplied by building integrated photovoltaic (BIPV).
  3. Use of energy efficient lighting fixtures (T5 lamps).
  4. Use of lux level sensor to optimize operation of artificial lighting.

Optimized Energy Systems / HVAC system

Chilled beam system/ VFD/ Screw Chillers

  • 160 TR of air conditioning load of the building is met through Chilled beam system. Chilled beam are used from second to sixth floor. This reduces energy use by 50 % compared to a conventional system.
  • HVAC load of the buildings is 40 m2/TR, about 50% more efficient than ECBC requirements (20 m2/TR)
  • Chilled water is supplied at 16° C and return temperature is 20° C.
  • Drain pans are provided with the chilled beams to drain out water droplets due to condensation during monsoon.
  • Water cooled chillers, double skin air handling units with variable frequency drivers(VFD)
  • Chilled beams save AHU/FCU fan power consumption by approximate 50 kW.
  • VFDs provided in chilled water pumping system, cooling tower fans and AHUs.
  • Fresh supply air is pre cooled from toilet exhaust air through sensible & latent heat energy recovery wheel.
  • Control of HVAC equipment & monitoring of all systems through integrated building management system.
  • Functional zoning to reduce air conditioning loads.
  • Room temperature is maintained at 26 ±1 ° C

Geothermal heat exchange system

  1. There are 180 vertical bores to the depth of 80 meter all along the building premises. Minimum 3 meter distance is maintained between any two bores.
  2. Each bore has HDPE pipe U-loop (32mm outer diameter) and grouted with Bentonite Slurry. Each U-Loop is connected to the condenser water pipe system in the central air conditioning plant room.
  3. One U-Loop has 0.9 TR heat rejection capacity. Combined together, 160 TR of heat rejection is obtained without using a cooling tower.

Indira Paryavaran Bhawan
Ministry of Environment and Forest (MoEF)

Renewable Energy

  • Solar PV System of 930 kW capacity
  • Total Area: 6,000 m2
  • Total Area of panels: 4,650 m2
  • No of panels: 2,844
  • Annual Energy Generation: 14.3 lakh unit

ACTUAL GENERATION ON SITE ( as on 25.01.2014)

  • Power supply to grid started on 19.11.2013
  • Power generation achieved: 300 kWh per day
  • Total generation: 2.0 kWh

Indira Paryavaran Bhawan
Ministry of Environment and Forest (MoEF)

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