Powering the Software Defined Network

A Hybrid Cooling System for Telecommunication Base Stations

Ehsan B. Haghighiehsanbh1@gmail.com

Thermal Designer

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Contents

• Introduction• Different Closed Systems• Hybrid System• Energy and Controlling Model• 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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Vapour Compression System

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Thermosiphon system

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Pump-driven Loop System

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Hybrid System

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Previous Studies

Air Conditioning

Thermosiphon

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Energy Model

INFSOLENVITCOOL QQQQQ

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Controlling Model

If ΔT ≤ 5 °C=> ACIf 5 °C < ΔT ≤ ΔTTS => DUIf ΔT > ΔTTS => TS

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Controlling Model

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Case Studies• A typical BTS with L=4 m, W=3 m, and H=2.8 m• QIT = 4.4 kW (on average)• UEnv = 1 W/m2K• Copenhagen (Denmark), San Francisco (USA), Shanghai (China) and

Dubai (UAE)• Weather data: ASHRAE handbook

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Copenhagen, Denmark

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Copenhagen, Denmark (month June)

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San Francisco, USA

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Shanghai, China

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Dubai, UAE

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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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Conclusion• A hybrid cooling system including an air conditioner

and a thermosiphon with individual loops is suggested to reduce total energy consumption for a typical BTS

• This system can be operated in three modes: air conditioning, thermosiphon, and dual

• The potential of saving energy is remarkable and by increasing the set point temperature the share of air conditioning mode is reduced while the share of thermosiphon is increased