CII SOHRABJI GODREJ GREENBUSINESS CENTRE

LOCATIONHyderabad, India

NAMECII Sohrabji Godrej Green Business Centre

DEVELOPERThe project is a unique and successfulmodel of public-private partnershipbetween the Government of AndhraPradesh, Pirojsha Godrej Foundation,and the Confederation of Indian Industry (CII), with the technical support of USAID (United State Agency for International Development)

ARCHITECTURAL DESIGNKaran Grover and Associates, India

SIZE4.5 acres (total site area)1,858 m2 (total built up area)1,115 m2 (total air-conditioned area)

TYPEOffice building

BUILDING DETAILSOffice buildingSeminar hallGreen Technology Centre displayingthe latest and emerging green buildingmaterials and technologies in IndiaLarge numbers of visitors are escortedon green building tour

RATINGSAwarded the LEED Platinum Rating forNew Construction (NC) v 2.0 by theU.S. Green Building Council (USGBC)in November 2003

FUNCTION:

The confederation of Indian industry (cii) works to create and sustain an environment conducive to the development of India, partnering industry, government, and civil society, through advisory and consultative processes. The CII-Sohrabji Godrej Green Business Centre serves as a demonstration building for the industry in India and other countries of the world.

Year: 2003Location: Hyderabad, IndiaBuilding Type: CorporateType: ExtensiveSystem: CustomSize: 11000 sq.ft.Slope: 6%

The centre is housed in a green building which received the prestigious LEED (Leadership in Energy and Environmental Design) Platinum rating in 2003.

WIND TOWERS

SOLAR PVROOF GARDEN

WATER BODY

It remains fairly warm most of the year. Receive less rainfall in the monsoon. Temperatures come down in the months of

December and January and the nights become quite cool in and around the Hyderabad city.

During the summer months, the mercury goes as high as 42° C while in winters the minimum temperature may come down to as low as 12° C.

CLIMATE

PLAN

Central courtyard.

Roof garden - protects heat penetration, cuts

down heat-island effect

High performance glazing to bring in natural

light while minimizing heat ingress.

Usage of light glazing and vision glazing.

Jali (perforated) wall for bringing in natural light as well as ventilation .

Energy saving system.

GREEN BUILDING FEATURES

COURTYARDS The courtyards act as "light wells,"

illuminating adjacent work areas.

When this light is not sufficient, sensors trigger the deployment of efficient electric lights.

Dimmers automatically control the illumination levels, turning the lights off when they're unnecessary.

occupancy sensors prevent a light from being switched on at an unoccupied workstation.

SOLAR SYSTEM Harvesting of solar energy - 20% of the buildings

energy requirement is catered to by solar photovoltaic The Solar PV has an installed capacity of 23.5 KW

Average generation is 100-125 units per day

The solar panels are placed on the eastern side and they are sloping which helps production of energy throughout the day

as it is a commercial building more amount of energy is consumed during the working hours [day] compared to the evenings.

ROOF GARDEN Absorbing heat and radiating it into the building. This is

minimized through the roof gardens covering 55% of the roof area.

Roof garden prevent formation of heat islands on the roof and acts as insulation to ingress of solar heat.

Rain water harvesting. Seepage into the ground have been installed inpedestrian areas and parking.

The green roofs on the curvey building are divided into parcels that are separated by parapets. On top of a concrete roof, the green roof system begins its build-up with three layers of waterproofing. The green roof system comprises 2" of sandy soil topped with the same pervious paver blocks used at grade, and overlain with a uniform grass sod. In their appearance and composition, the green roofs are identical to the grassy pedestrian and parking areas at grade.

All wastewater and runoff generated by the building is recycled by "root zone treatment" where specially selected plants purify and filter the water that irrigates them. Water leaving the root zone treatment is directed to one of three ponds, thereafter to be used for domestic purposes.

The building achieves a 35 percent reduction of municipally supplied potable water, in part through the use of low-flush toilets and waterless urinals.

As part of the zero discharge design, recycled water from the building is used for irrigation and any runoff is directed to percolate at grade. During the dry season, the green roofs are irrigated daily

Double-glazed units with argon gas filling between the glass panes enhance the thermal properties.

Variations in thickness have a certain effect, up to a certain limit, on the percentage of radiation allowed to penetrate and on thermal conductance of the composition.

The main advantage of this type of cross-section is its ability to reduce heat transfer from one pane to the other, both by conduction and by radiation.

DOUBLE GLAZED GLASS

USAGE OF LIGHT GLAZING AND VISION

GLAZINGThe double glazed glass will just allow the diffused sunlight to pass through and will radiate the solar radiation back. It is located in the western direction because the suns rays is highly radiant when it is setting.

NATURAL LIGHTING

Natural light deflection systems can direct light deep into the room and ensure better natural lighting provisions.

North Light For indoor Day lighting The most prominent feature of the building is that almost 90% of the interiors are

daylight. This is achieved by providing north lighting and windows looking into courtyards.

The regularly occupied areas of the main office and information Centre are daylight.

Fig. 1 – North light in CII – Sohrabji Godrej Green Business Centre

REFLECTIVE GLASS (MIRROR) This material will most significantly reduce penetration of radiation from the reflecting side to the non-reflecting side (penetration of 11-37% of total striking radiation).

Such glazing is used in this building where it is desir able to maintain eye contact with the outside as well as to prevent penetration of radiation and in areas where it is hot most days of the year.

WIND TOWERS INTEGRATED WITH HVAC The wind tower is one of the traditional passive-cooling techniques of the sub-continent. Here, it has been combined with the HVAC system to reduce energy consumption. The fresh air that goes in the AHU is pre-cooled in the wind tower, reducing the intake air temperature by 3 to 5 deg. C. The wind tower itself is made of hollow masonry, and acts as a ‘thermal mass’. It is cooled periodically by tricking water from the top of the tower. Fig. 21 – Wind tower integrated with HVAC

WIND SYSTEM A combination of sensible cooling in the ground and

evaporative cooling with the flow of air induced by the wind tower can be achieved by a configuration as shown.

The heat loss from air results in a decreased air temperature, but no change in the water vapour content of the air.

Wind tower with evaporative cooling

DAYTIME AND NIGHT TIME OPERATION OF A WIND TOWER

The hot ambient air enters the tower through the openings in the tower and is cooled, when it comes in contact with the cool tower and thus becomes heavier and sinks down. When an inlet is provided to the rooms with an outlet on the other side, there is a draft of cool air. After a whole of heat exchange, the wind towers become warm in the evening.

During night the reverse happens; due to warm surface of wind tower and drop in temperature of ambient air due to buoyancy effect, warm air rises upwards. As a result, cooler ambient air is sucked into the room through the window. As a bye-product of this process, wind tower loses the heat that was collected during the day time and it becomes ready for use in cold condition up to the morning.

Wind tower design with openings on all four sides Wind tower design with evaporatively cooled system

Due to the unpredictable wind direction, opening on all four sides are provided with an additional affect due to wind pressure. The rate of heat transfer mainly depends on surface area with which, the air comes in contact. Here the surface area is increased by having vertical conduits, which gives less resistance to air flow. Further, the effectiveness is increased by having sprinklers to promote the evaporative cooling

•A large amount of energy — and pollution — was also reduced through choices in the production and transportation of building materials.

•An impressive 77 percent of the building materials use recycled content in the form of fly ash, broken glass, broken tiles, recycled paper, recycled aluminum, cinder from industrial furnaces, bagasse (an agricultural waste from sugar cane), mineral fibers, cellulose fibers, and quarry dust.

•The building reuses a significant amount of material salvaged from other construction sites like toilet doors, interlocking pavement blocks, stone slabs, scrap steel, scrap glazed tiles, shuttering material and, interestingly, the furniture in the cafeteria. A waste management plan ensured that 96 percent of construction waste was recycled.

SUSTAINABLE MATERIALS

USE OF TRADITIONAL JALLI Jallis or Lattice walls are used to

prevent glare and heat gain while ensuring adequate day lighting and views.

The building is cantered around a circular courtyard .the screen wall or jaali is effectively used to cut down the harsh sun, yet allow the flow of wind

The jalli,gives definition and an aesthetic appeal to a space.

The building boasts of lighting energy savings of 88 percent compared to an electrically lit building of the same size.

Vegetation that was lost to the built area was replaced by gardens on 55 percent of the roof area.

The building achieves a 35 percent reduction of municipally supplied potable water, in part through the use of low-flush toilets and waterless urinals.

Thirty percent of users have shifted to alternative modes of transportation: carpools, bicycles, and cars that run on liquefied petroleum gas, a low-polluting alternative to conventional gasoline and diesel.

95 percent of the raw material was extracted or harvested locally.

An impressive 77 percent of the building materials use recycled content.

A waste management plan ensured that 96 percent of construction waste was recycled.

CONCLUSION

References:

http://www.urbanhybridization.net/Anup_Kumar_Prasad.pdf

http://www.asiabusinesscouncil.org/docs/BEE/GBCS/GBCS_CII.pdf

http://www.greenroofs.com/projects/pview.php?id=1076

http://www.indiaenvironmentportal.org.in/files/file/CII_Sohrabji_Godrej_Green_Business_Centre-Case_Study.pdf

https://thearchiblog.wordpress.com/2011/09/24/karan-grover-sohrabji-godrej-green-business-center-hyderabad/

http://www.slideshare.net/baburajiv2007/leed-india-case-study-cii-sohrabji-godrej-itc-green-center?utm_source=slideshow&utm_medium=ssemail&utm_campaign=download_notification

http://www.slideshare.net/gauravjhunjhunwala89/sohrabji-godrej-green-business-centre

http://www.slideshare.net/gattiTeja/leed-certified-buildings-examplspresentation-team-work

http://www.architectureweek.com/cgi-bin/awimage?dir=2004/0922&article=environment_1-2.html&image=12519_image_6.jpg