Earth Air Tunnels utilize the constant underground temperature to provide buildings with air conditioning. The tunnels work best for large buildings by allowing air pumped through to attain the cooler earth temperature. Variables like tunnel length, depth, diameter, and air/earth temperature differences determine effectiveness. Earth Air Tunnels have been successfully used at TERI retreat in Delhi to maintain living quarters between 20-30°C year-round.

1. SWARNIMA BA07ARC018
MAITREYI BA07ARC007

2. Earth Air Tunnel
• The Earth Air Tunnel (EAT) systems utilizes the heat-storing capacity of
earth and the fact that the year round temperature four meter below the
surface remains almost constant throughout the year. That makes it
potentially useful in providing buildings with air-conditioning. Depending
on the ambient temperature of the location, the EAT system can be used
to provide both cooling during the summer and heating during winter.
• The tunnels would be especially useful for large buildings with ample
surrounding ground. The EAT system can not be cost effective for small
individual residential buildings.
• The ground temperature remains constant and air if pumped in
appropriate amount that allows sufficient contact time for the heat
transfer to the medium attains the same temperature as the ground
temperature.

3. Variables of the Earth Air Tunnel:
• Length of the tunnel (Enough for air to lose
heat to a certain extent)
• Depth of the tunnel
• Material of the tunnel
• Diameter of tunnel (due to inner surface area)
• Temperature of air
• Difference between ambient temperature and
earth temperature

6. •Earth Air Tunnels have been
used successfully at TERI
retreat at Gurgaon, Gul Pahari,
Delhi, where the underground
tunnels serve the living
quarters. The living quarters
are maintained at
temperatures approximately
between 20 to 300
C round the
year.
• The system utilizes tunnel, air
intake ports and
dehumidification. The treated
air is passed to the spaced
through ducts and supply grills
and are allowed to escape to
the atmosphere after affecting
the desired heat transfer in the
space.

7. •Earth Air Tunnels have been
used successfully at TERI
retreat at Gurgaon, Gul Pahari,
Delhi, where the underground
tunnels serve the living
quarters. The living quarters
are maintained at
temperatures approximately
between 20 to 300
C round the
year.
• The system utilizes tunnel, air
intake ports and
dehumidification. The treated
air is passed to the spaced
through ducts and supply grills
and are allowed to escape to
the atmosphere after affecting
the desired heat transfer in the
space.