Adopting Low-cost Alternative for Energy Saving

Featured Case Study

Transport Corporation of India Ltd, Gurgaon

Energy Efficient Features

  • Appropriate orientation leading to lesser heat gains
  • Use of single glazed recessed windows to increase indoor thermal comfort
  • Use of water-bodies as evaporative cooling technique
  • Ample natural light available in various areas

Energy Saving Potential

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North-East and South-West Orientation
Insulated walls and roof
WWR (Window Wall Ratio): 14.1%
Building Envelope
Wall U-Value: 1.67 W/m2K
Roof U-Value: 1.01 W/m2K
Glass U-Value: 5.7 W/m2K
Glass SHGC : 0.52
Lighting System
LPD (Lighting Power Density): 5.9 W/m2
Daylight and artificial light integration
Small windows at the seating areas reduce thermal discomfort
HVAC System
Central plant with two vapour chillers
COP (Coefficient of Performance)- 4.21
13 AHUs (Air Handling Unit) installed to provide thermal comfort

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Energy Performance Index

Note: In units of KWh/sq.mts/annum

Roadmap to High Performance Buildings

Adopting ECMs (Energy Conservation Measures)

  • Alternative passive strategies to reduce energy consumption and minimize wastage
  • Impacts the lifecycle cost of the building
  • Implemented across four major categories – Building Design, Building Envelope, Lighting and HVAC
  • Selected on the basis of their saving potential, cost of implementation, and the payback period
  • Beneficial in terms of lower power bills and lesser carbon dioxide emissions

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Energy Conservation Building Code

A building code launched by Bureau of Energy Efficiency, Government of India in 2007; it sets minimum energy performance standards for the design and construction of large commercial buildings.
High Performance Building

Buildings that have integrated solar passive architectural design strategies, along with the energy efficiency measures adopted as per ECBC.
EPI (Energy Performance Index)

The ratio of total electricity used in a building to its total built up area. It is expressed as KWh/sq.mts/annum.

Building Blocks

Build your basic understanding about HPCBs. Get to know the terms most commonly used by building professionals when they discuss about a HPCB.

Climate Zones

Hot and Dry
In hot and dry climate, it is imperative to control solar radiation and movement of hot winds. The building design criteria should thus, provide appropriate shading, reduce exposed area, and increase thermal capacity.

Temperate climate requires a building design which would reduce heat gain by providing shading, and promote heat loss by ventilation.

The building design criteria for a composite climate are more or less the same as for hot and dry climate (appropriate shading, reduced exposed area, and increased thermal capacity) except that maximizing cross ventilation is desirable in the monsoon period.

Cold climate requires buildings to have appropriate insulation and infiltration to resist heat loss, and promote heat gain by directly admitting and trapping solar radiation within the living space.

Warm and Humid
The building design in a warm and humid climate should aim at reducing heat gain by providing shading, and promoting heat loss by maximizing cross ventilation. Dissipation of humidity is also required to reduce discomfort.

India set to embrace energy efficient buildings

Laying the roadmap for establishing green buildings in India, eminent building professionals from the government and the industry will discuss the prospects of high performance commercial buildings in the country at an international workshop to be held on 4 February 2010. Low-energy design and cooling strategies for commercial buildings will also be presented on this occasion.

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Second International Workshop

The 2nd international workshop under the project ,”High Performance commercial buildings in India” was hosted in New Delhi as a special event during the Delhi Sustainable Development Summit...


First International Workshop

First international workshop to disseminate the initial project results amongst APP partner countries and building industry stakeholders in India was organized on 10th April, 2009.


To get information about the partners, stages of the project, and the findings of a study on low-energy buildings, kindly view this brochure.

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