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Buildings Guide


ZED Collective

Low-Energy Building
Year 2008
Municipality Yelankha
Location Bangalore, India | OSM
State Karnataka
Area (TFA) 60273 m2
Dwellings 132
Cost 83 EUR/m2
Consumption 39 kWh/m2/year (primary energy)
Specific Primary Energy Demand in KWh/m2a

ZED collective is a residential building complex located in Yelankha municipality of Banglaore in hot and humid climatic zone. Total built up area of the project is 60,273m2, with a total of 132 dwelling units. The project incorporates several energy saving, water saving measures and use of energy efficient material in construction.


Overall performance

Energy performance index (EPI) of the project is 39kWh/m2/year. The overall performance of the project is affected by the use of energy efficient mechanical systems, with incorporation of low energy materials used during the construction.

Cost and effectiveness

The overall cost of the project accounts to 4,991,000 Euro, out of which cost of building envelope is 4,025,000 Euro and cost of technical installation is 966,000 Euros.


Actors

Developer
Biodiversity Conservation India ltd.

Architect
Space matrix Design consultants

Building basics

Year of completion 2008
Number of units 132
Number of occupants None people
Elevation None m

Building areas


Special features

Additional Sustainable site features includes

  • Heat reflective coating has been done on the exposed roof areas to reduce the urban heat island effect.
  • 100% rain water harvesting is done at the site rooftop collection, storage and reuse on site.
  • A provision for electric charging of 2 and 4 wheelers is provided at the site.

The external walls of the building are constructed with hollow block which have higher thermal resistance as compared to the conventional brick wall. The heat reflective thermal coating has been done on the exposed roof of the building to minimize the heat gains from roof. The windows comprise of single glass.

Type of construction Middle

Ground floor
U-value 3.060 W/m2K
Total thickness 20.00 cm
Total area m2
Material Thickness Thermal conductivity λ
RCC Slab 15.00 cm None W/mK
Cement Mortar 4.00 cm None W/mK
Ceramic Tile 1.00 cm None W/mK
(From outside to inside)
Basement walls
U-value None W/m2K
Total thickness 43.00 cm
Total area m2
Material Thickness Thermal conductivity λ
Hollow Block Wall 20.00 cm None W/mK
Concrete retaining Wall 23.00 cm None W/mK
(From outside to inside)
External walls
U-value 0.700 W/m2K
Total thickness 22.00 cm
Total area m2
Material Thickness Thermal conductivity λ
Cement Plaster 1.00 cm None W/mK
Hollow Block Wall 20.00 cm None W/mK
Cement Plaster 1.00 cm None W/mK
(From outside to inside)

Windows

U-value window None W/m2K
Total area 1776 m2
Glass infill
Coating/Tint
Solar heat gain coefficient 0.85
U-value glass None W/m2K
U-value window frame None W/m2K

Passive strategies

The earth air tunnel cooling system is installed in the residential complex, for cooling applications of the dwelling units. The earth air tunnel cooling system is a low energy cooling system.

Energy efficient electromechanical systems have been installed in the residential complex. There is no heating requirement in the projects. For cooling purpose Earth air tunnel has been installed along with energy efficient air conditioning units.

Indoor design temperature summer 28 °C
Indoor design temperature winter 22 °C

Heating system

No heating requirement in the project.


Cooling system

The cool air supply from the Earth air tunnel is being fed in the apartments, along with individual air conditioning units of COP 3.5 have been installed in the apartments.


Hot water system

A centralized evacuated tube type solar water heating system along with individual electric geysers in each apartment has been installed. 


Power generation

There is no additional source of power generation in the complex. The entire electrical supply depends on the grid.

Detailed information on installed power generators not known.


Energy efficient lighting and appliances

The energy efficient lighting system has been installed in the residential complex. For outdoor applications LED fixtures and for indoor CFL has been used.

The energy consumption of the building has estimated based on the simulation results. The energy simulation has been carried out in IT Toolkit EnEff: ResBuild India. The annual electricity consumed in the building is 2,351,239 kWh.

Primary energy consumption 2351239.00 kWh/year
Primary energy consumption (ref. building) 2351239.00 kWh/year
Specific primary energy consumption 39.00 kWh/m2/year
Specific primary energy consumption (ref. building) 102.00 kWh/m2/year
Differentiated specific primary energy demand and production

Accumulated specific primary energy demand and production

The overall cost of the project accounts to 4,991,000 Euro, out of which cost of building envelope is 4,025,000 Euro and cost of technical installation is 966,000 Euros.

Envelope costs 4025000 EUR
Systems costs 966000 EUR
Total investment costs 4991000 EUR
Cost: 82.80 EUR/m2
Yearly energy costs 291500 EUR/year

Investment cost

Absolute building investment costs

Specific building investment cost

Annual Costs

Absolute annual costs
Specific annual cost

Assumptions

Local Currency INR
Currency rate to EUR 0.01400 (May 2, 2017)

Energy prices

Electricity 0.1250 EUR/kWh

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