| Year | 2013 |
| Municipality | South Delhi Municipal Corporation |
| Location | New Delhi, India | OSM |
| State | New Delhi |
| Area (TFA) | 31400 m2 |
| Dwellings | None |
| Cost | 535 EUR/m2 |
| Consumption | -14.2 kWh/m2/year (primary energy) |
Indira Paryavaran Bhawan is the new office for Ministry of Environment, Forestry and Climate Change (MoEF&CC) India. Total built up area of the campus is 31,400 m2 and consist of two dwelling units. The construction of building was completed in 2013. The Building is certified under the GRIHA green building rating system, and holds a 5 star certification and is the first net zero building of India. The design approach of the building concentrates on natural ventilation, higher efficiency of electro mechanical system installed and utilization of renewable energy system in the building. Out of the total built up area of 31, 400 m2, only 11,967 m2 is air-conditioned and the rest of the building is naturally ventilated. The building is designed by Central Public Works Department, India.
The actual energy performance index of the Indira Paryavaran Bhawan building is 24.13kWh.m2/ year, based on the actual energy consumption of the building for the year 2013. Various measures were under taken to improve the overall performance of the building.
The total building cost is EUR 16,800,000, out of which the total electrical plus mechanical cost is EUR 6,241,200 and rest EUR 10,683,400 is the total civil cost of the building.
| Year of completion | 2013 |
| Number of units | None |
| Number of occupants | None people |
| Elevation | None m |
The building envelope construction comprises of heavy weight construction. The external walls of the building have a U factor of .221 W/m2K. The external wall construction consists of 30 cm thick AAC block, 7 cm thick mineral wool insulation, 12 cm thick air gap and 12 cm thick 'Fal-G' (proprietary blend of fly ash (Fa), lime (L) and gypsum (G)) block brick. The total surface area of the wall comes out to be 1,046 m2.
The external roof of the building consist of 2 cm thick clay tile, 6 cm thick cement mortar, 4 cm thick PUF insulation, 6 cm thick brick bat coba, 6 cm thick cement mortar,10 cm thick concrete. The total surface area of the roof is 876 m2.
Windows are double glazed with gas filling with a U-Value of 0.26 W/m2K and SHGC of 0.32 and aluminium frame.
| Type of construction | Middle |
| Shading | Recessed windows |
| U-value | 0.221 W/m2K |
|---|---|
| Total thickness | 61.00 cm |
| Total area | m2 |
| Material | Thickness | Thermal conductivity λ |
|---|---|---|
| Autoclave Aerated Concrete (AAC) block | 30.00 cm | None W/mK |
| Mineral Wool Insulation | 7.00 cm | None W/mK |
| Air Gap | 12.00 cm | None W/mK |
| Fal-G Brick Block | 12.00 cm | None W/mK |
From outside to inside.
| U-value | None W/m2K |
|---|---|
| Total thickness | 34.00 cm |
| Total area | m2 |
| Material | Thickness | Thermal conductivity λ |
|---|---|---|
| Clay Tile | 2.00 cm | None W/mK |
| Cement Mortar | 6.00 cm | None W/mK |
| Polyurethane Foam (PUF) Insulation | 4.00 cm | None W/mK |
| Brick Bat Coba | 6.00 cm | None W/mK |
| Cement Mortar | 6.00 cm | None W/mK |
| Concrete | 10.00 cm | None W/mK |
| U-value window | 0.26 W/m2K |
|---|---|
| Total area | 1693 m2 |
| Glass infill | Air |
|---|---|
| Coating/Tint | None |
| Solar heat gain coefficient | None |
| U-value glass | None W/m2K |
| U-value window frame | None W/m2K |
The Indira Paryavaran Bhawan office building for the ministry of Environment, Forest and Climate Change has been planned in two blocks facing the north south direction, with a linear open court in the centre. The building block creates a porous block form to optimize the air flow movement throughout the site and the North-South orientation allows for optimum solar access and shading.
The entire roof surface of the building, the court is covered by solar PV panels. They protrude on the edges further create a shaded micro climate. Indira Paryavaran Bhawan is the first net zero building of India. All the corridors of the building are naturally ventilated. Optimum day-lit zone is maintained in the office spaces.
The building is GRIHA 5 star rated Building.
Energy efficient central heating and cooling systems have been installed in the building.
| Indoor design temperature summer | 28 °C |
|---|---|
| Indoor design temperature winter | 22 °C |
Energy Efficient central cooling system has been installed in the building.
The air conditioning load is estimated as 440 TR for which 3 numbers of (2 working +1 stand by) two 240 TR and one number of 200 TR water-cooled screw chiller are installed.
Variable air volume controlled fans are provided to each of the AHUs supplying air to the area where chilled beam system at zone is not provided. On all the other areas where the chilled beam system is provided at zone level constant volume AHU are providing the primary air.
The latent load of the space is met by AHU and maximum possible sensible load is met by chilled beam supported by AHUs.
The naturally ventilated office spaces in the building has open able windows fore ventilation purpose. The ventilation air requirement for the conditioned spaces is met by all AHUs on similar schedule (building is provided with two dedicated make-up air unit. Each make-up air unit is further provided with enthalpy based heat recovery system). Finally, the ancillary spaces like restrooms are facilitated with exhaust air fans, and staircases are naturally ventilated.
A 930 kWp rooftop photovoltaic system has been installed in the building. The annual electricity generation is approximately 1,430,000 kWh (units).
Detailed information on installed power generators not known.
Energy efficient lighting has been used such as LED for outdoors and efficient tubular fluorescent lights have been installed in the interiors.
| Primary energy consumption | -169980.00 kWh/year |
| Primary energy consumption (ref. building) | 1602400.00 kWh/year |
| Specific primary energy consumption | -14.20 kWh/m2/year |
| Specific primary energy consumption (ref. building) | 133.90 kWh/m2/year |
The total building cost is EUR 16,800,000, out of which the total electrical plus mechanical systems cost is EUR 6,241,200 and the rest EUR 10,683,400 is the total civil cost of the building.
| Envelope costs | 10683400 EUR |
| Systems costs | 6241200 EUR |
| Total investment costs | 16800000 EUR |
| Yearly energy costs | -19548 EUR/year |
| Local Currency | INR |
| Electricity | 0.1150 EUR/kWh |
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