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Atal Akshaya Urja Bhavan, New Delhi

Summary

Location New Delhi
Coordinates 28°35’20.0″N 77°13’48.3″E
Occupancy Type Office
Typology New Construction
Climate Type Composite
Project Area 38147 m2
Date of Completion 2022
Grid Connectivity Grid-Connected
EPI 47 kWh/m2/yr
Architect Edifice Consultants Pvt. Ltd
MEP Design Guidance Sunil Nayyar Consultants Pvt. Ltd.
Structural Consultants Vintech Consultants
Landscape Consultants Design Cell

Atal Akshay Urja Bhawan, a net-positive energy building functions as the headquarters of the Ministry of New and Renewable Energy (MNRE).

Recognized by GRIHA, the building serves as an exemplary government office building. It showcases the Ministry’s mission to encourage future development that incorporates sustainable principles and integrates renewable energy systems into the buildings.

Atal Akshay Urja Bhawan
New Delhi

Orientation 

The building is oriented along a north-south axis, with a central atrium serving as the main entrance. The south wing has been angled to maximize natural light from the north. A central corridor splits the building’s layout into two parts, with functional spaces facing the east, and services facing the west to protect occupied zones from the harsh west sun. This strategy effectively addresses the challenge posed by the north-south alignment of the site.

Building Envelope

The west facade of the building is a solid mass with openings covered with GFRC jallis, allowing for cross-ventilation.

The east facade is a double wall constructed with ACC for thermal insulation. This cavity wall is  filled with 200mm thick glass wool insulation.

The south wall serves as a solar wall, which provides shading to the building facade while also generating on-site electricity.

Daylighting

The offices are located on the 3rd-8th floor to maximize natural light, offer better views, and provide isolation from public activities taking place below.

90% of the floor area receives adequate, glare-free daylight during working hours.

Fenestration

The opening of the east and north facades have a  double-glazed unit (DGU) system. This allows for daylight to enter interior spaces while also providing insulation.

Landscaping

The landscape is a combination of existing trees that have been preserved and new plantations that are local and native. The walkways leading to the building entrance are covered by trees.

Atal Akshay Urja Bhawan
New Delhi

Cooling System

The building uses a hybrid cooling system that combines a traditional chiller and a radiant chiller, each with a 215-ton refrigeration capacity (TR). The radiant cooling system utilizes water-cooled screw-chillers and ceiling pipes. It achieves uniform cooling through radiant and convection heat transfer from chilled ceiling panels in the room. These radiant chillers are 33% more efficient, removing the need for large air handling units. Chilled water at about 15 degrees Celsius is supplied, and it returns at around 20 degrees Celsius, cooling the ceiling and, in turn, cooling the room.

The fresh air system is pre-cooled using toilet exhaust and delivers 100% fresh air through a three-stage evaporative cooler. The heat recovery wheel-based fresh air system includes both high-temp and low-temp coils, along with an EC motor.

Building Management System

The building management system is programmed to limit the load, featuring an integrated plant optimizer for controlling and reducing power consumption and refrigeration capacity (TR). It also features demand control ventilation with CO2 and temperature sensors.

Lighting

In office areas, the average lighting power density is 3.77 watts per square meter, while parking areas have a lower density of 1.07 watts per square meter.

Atal Akshay Urja Bhawan
New Delhi

A large-span solar paneled roof extends beyond the building structure and shades both the terrace floor and the south wall, These photovoltaic panels on the roof (6,038.5 square meters) and the south wall together generate 1100 kW, with the potential to produce 19 lakh units per year.

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