Free Cooling: A Complete Solution on Reducing Total Energy Consumption for Telecommunication Base...
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Transcript of Free Cooling: A Complete Solution on Reducing Total Energy Consumption for Telecommunication Base...
Powering the Software Defined Network
Free Cooling: A Complete Solution on Reducing Total Energy Consumption for
Telecommunication Base Stations
Ehsan B. Haghighi
[email protected] Designer
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Contents
• Introduction
• Free Cooling
• Energy and Controlling Model
• System Components and Operation
• Single and Dual Zone Strategies
• Case Studies and Results
• Conclusion
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Introduction
• Cooling traditionally counted for 25-50% of the total energy consumption in a typical base station.
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Free Cooling
Extracting fresh air into the shelter
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Facebook data centre in Luleå, Sweden
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Energy Model
INFSOLENVITCOOL QQQQQ
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Controlling Model
if TSET <= TO+ΔTlag=> Air Conditioning if TSET > TO+ΔTlag => Free Cooling
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System Components
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System Operation
Free cooling Air conditioning
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Single and Dual Zone Strategies
Single zone strategy Dual zone strategy
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Case Studies• A typical BTS with L=4 m, W=3 m, and H=2.8 m• QIT = 4 kW and QBattery = 0.4 kW (on average)• UEnv = 1 W/m2K and UBattery = 0.5 W/m2K• ΔTlag = 2 °C• Tset = 25 °C for the single zone strategy • Tset = 25 °C (battery compartment) and Tset = 35 °C (IT/electronic) for
the dual zone strategy• COP = 2.5 and idle fan power consumption for the main air
conditioning system are assumed to 100 W• The power consumption for the free cooling unit is assumed to be
80 W on average• In the dual zone strategy a small air conditioning unit with COP of
2.4 and 75% running time is used to provide the required cooling load for the smaller zone
• The area for the smaller zone is assumed to be 10% of the area of the main zone
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Locations
• Copenhagen (Denmark), San Francisco (USA), Shanghai (China) and Dubai (UAE)• Weather data: ASHRAE handbook
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Copenhagen, Denmark
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San Francisco, USA
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Shanghai, China
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Dubai, UAE
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Results
Cooling System Size (kW)
AC FC
Copenhagen, Denmark 5.0 4.9
San Francisco, USA 4.9 4.9
Shanghai, China 5.5 4.9
Dubai, UAE 6.0 4.8
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Copenhagen, Denmark
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San Francisco, USA
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Shanghai, China
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Dubai, UAE
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Results
Savings (%)
Single Zone Dual Zone
Copenhagen, Denmark
91 85
San Francisco, USA 94 86
Shanghai, China 53 85
Dubai, UAE 21 68
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Conclusion
• Free cooling is a well-proven method to reduce total energy consumption in a typical BTS
• Free cooling can be used in either single or dual zone strategies
• In hot and warm climate zones dual zone strategy is recommended