earth air tunnel cooling system pradeep kumar experience on eat by... · earth air tunnel cooling...
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EARTH AIR TUNNEL COOLING SYSTEM
Pradeep Kumar Senior Fellow & Associate Director
Sustainable Habitat Division
TERI, New Delhi
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Low Energy Cooling System
• Site: TERI university campus, New Delhi
• 32 rooms hostel
• Total air conditioning load: 35 TR
• System COP:2.34
Conventional design
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Low Energy Cooling System
• Adaptive thermal comfort: 26~28 0 C /60~70 %
• Inside design condition: 27 0 C/65%
• Total RSH: 39909 W
• Temperature rise: 5 0 C
• Total air quantity required: 6000 lps
Earth air tunnel along with air washer & DX coil
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EAT Cooling System at TERI University
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EAT thermal performance in summer
DBT-41.8 C
WBT-23.6 C
DBT-28 C
WBT-20 C
DBT-21 C
WBT-20 C
DBT-22 C
WBT-20.3 C
DBT-27 C
RH-65%
AHU Room
EAT Duct AW
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Conditions of air Entering & Leaving EAT
DBT-107 F
WBT-75 F
W – 79.5 Gr/lb
DBT-84 F
WBT-68 F
W – 79.5 Gr/lb
•Soil Thermo-physical properties selected: •Soil thermal conductivity = 2.0 W/m.K
•Soil density = 2000 kg/m3 •Soil specific heat = 2000 J/kg.K
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EAT System Design
Earth Air Tunnel 2 Tunnel each having 3 pipes Pipe diameter: 450 mm Pipe length: 100 m
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AHU System
Air Handling Unit
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EAT Cooling System
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Earth Air Tunnel Sizing
Pipe diameter selection
Case-1
• Diameter of pipe : 0.45 M
• Flow through pipe : 1000 lps
• Pipe velocity : 6.25 m/s
• Flow through pipe : 750 lps
• Pipe velocity : 4.7 m/s
Case-2
• Diameter of pipe : 0.6 M
• Flow through pipe : 1000 lps
• Pipe velocity : 3.57 m/s
• Flow through pipe : 750 lps
• Pipe velocity : 2.7 m/s
Pipe length selection
• L/D : 150~200
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Earth Air Tunnel Simulation Results
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EAT: Application of use of Geothermal Energy
• EAT is a technique in which air to soil heat exchange occurs to produce cooling in summer and pre-heating in winter.
• Two properties of underground soil: Dampening of temperature fluctuations with depth.
Phase lag between soil and ambient temperatures.
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Performance Parameters
• Thermal conductivity of soil
• Pipe Diameter
• Length of tunnel
• Air velocity in pipes
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Earth air tunnel outlet air temp in June
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Ambient and EAT outlet temperature variation for a typical day of June
Monitored EAT Outlet Temperature °C
Ambient Temperature °C
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Earth air tunnel outlet air temp variation in July (Monsoon)
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Ambient and EAT outlet temperature variation for a typical day of July
Monitored EAT Outlet Temperature°C
Ambient Temperature °C
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Thank You!!