Page 25 - GRIHA Manual Volume I - Introduction to National Rating System
P. 25
12 GRIHA Manual: Volume 1
30 °C in the monsoon. The system has been augmented by adding chillers for dehumidifi cation and
additional cooling during the monsoon.
Specially designed skylights, energy-effi cient lights, and a sophisticated system of monitoring and
controlling electricity consumption, light up the complex with less than 10 kilowatts; a comparable
conventionally designed structure would require nearly 28 kilowatts to provide the same level of
lighting.
A bed of reed plants (Phragmytes) clarifi es 5 cubic metres of waste water from the toilets and
kitchen every day; the recycled water is used for irrigation.
1.4.2 TERI University
The TERI University is situated at Plot No. 10, Institutional Area, Vasant Kunj, New Delhi, close to
the Grand Hotel. An architectural marvel, the campus has been planned to provide a setting that
enhances learning, while simultaneously showcasing the concept of green building. Besides passive
energy saving architectural designs, the buildings boast of the use of solar energy and an earth-air
tunnel to meet part of the air-conditioning requirements.
The campus is equipped with three types of cooling systems, integrated to take advantage of
diff erent innovative technologies to achieve energy effi ciency. They are discussed briefl y as under.
# Variable refrigerant volume systems (VRV)
# Earth Air Tunnel (EAT)
# Thermal storage
The VRV system is a modern air-conditioning system, similar to an effi cient version of a split air
conditioner. The VRV system is highly effi cient under partial load conditions and therefore, has been
used in areas with varying occupancies such as the offi ce block, laboratories, administrative block
and recreation and dining areas of the hostel block. It features customized control of individual
zones. Depending on the cooling demands of the building, variable refrigerant volumes circulate
through the chillers. The VRV system also eliminates the requirement of a plant room; piping and
ducting for chilled water; and contributes to 15% energy savings as compared to a conventional air
conditioning system.
Earth air tunnel system is used for free cooling/heating of the building for a major part of the
year. This technology uses the heat sink property of earth to maintain comfortable temperatures
inside the building. Supplementary systems have been used for extreme conditions (monsoon). In
such a system energy savings of nearly 50% compared to conventional system can be achieved. At
the campus, this system is used for providing comfort for the rooms in hostel block.
Thermal mass storage is used in the classrooms. It involves storing energy when available and
using it when required. In the proposed arrangement, cooling of the thermal mass is done during
night (when ambient temperatures are lower). During daytime when ambient temperatures are
high, the thermal storage is used as sink for the fresh air requirement.
The campus has an effi cient artifi cial lighting system designed for minimizing the energy
consumption without compromising the visual comfort in the building.
The measures contribute to 40% energy savings in comparison to a conventionally designed
building. Water saving measures have 25% reduction in the potable water use only by use of effi cient
fi xtures. In addition, reuse of wastewater for irrigation purpose through resource and energy effi cient
biological processes and rainwater harvesting for aquifer recharge also contribute to effi cient water
management.
30 °C in the monsoon. The system has been augmented by adding chillers for dehumidifi cation and
additional cooling during the monsoon.
Specially designed skylights, energy-effi cient lights, and a sophisticated system of monitoring and
controlling electricity consumption, light up the complex with less than 10 kilowatts; a comparable
conventionally designed structure would require nearly 28 kilowatts to provide the same level of
lighting.
A bed of reed plants (Phragmytes) clarifi es 5 cubic metres of waste water from the toilets and
kitchen every day; the recycled water is used for irrigation.
1.4.2 TERI University
The TERI University is situated at Plot No. 10, Institutional Area, Vasant Kunj, New Delhi, close to
the Grand Hotel. An architectural marvel, the campus has been planned to provide a setting that
enhances learning, while simultaneously showcasing the concept of green building. Besides passive
energy saving architectural designs, the buildings boast of the use of solar energy and an earth-air
tunnel to meet part of the air-conditioning requirements.
The campus is equipped with three types of cooling systems, integrated to take advantage of
diff erent innovative technologies to achieve energy effi ciency. They are discussed briefl y as under.
# Variable refrigerant volume systems (VRV)
# Earth Air Tunnel (EAT)
# Thermal storage
The VRV system is a modern air-conditioning system, similar to an effi cient version of a split air
conditioner. The VRV system is highly effi cient under partial load conditions and therefore, has been
used in areas with varying occupancies such as the offi ce block, laboratories, administrative block
and recreation and dining areas of the hostel block. It features customized control of individual
zones. Depending on the cooling demands of the building, variable refrigerant volumes circulate
through the chillers. The VRV system also eliminates the requirement of a plant room; piping and
ducting for chilled water; and contributes to 15% energy savings as compared to a conventional air
conditioning system.
Earth air tunnel system is used for free cooling/heating of the building for a major part of the
year. This technology uses the heat sink property of earth to maintain comfortable temperatures
inside the building. Supplementary systems have been used for extreme conditions (monsoon). In
such a system energy savings of nearly 50% compared to conventional system can be achieved. At
the campus, this system is used for providing comfort for the rooms in hostel block.
Thermal mass storage is used in the classrooms. It involves storing energy when available and
using it when required. In the proposed arrangement, cooling of the thermal mass is done during
night (when ambient temperatures are lower). During daytime when ambient temperatures are
high, the thermal storage is used as sink for the fresh air requirement.
The campus has an effi cient artifi cial lighting system designed for minimizing the energy
consumption without compromising the visual comfort in the building.
The measures contribute to 40% energy savings in comparison to a conventionally designed
building. Water saving measures have 25% reduction in the potable water use only by use of effi cient
fi xtures. In addition, reuse of wastewater for irrigation purpose through resource and energy effi cient
biological processes and rainwater harvesting for aquifer recharge also contribute to effi cient water
management.
