a hybrid cooling system for telecommunicatioin base stations

Powering the Software Defined Network

A Hybrid Cooling System for Telecommunication Base Stations

Ehsan B. Haghighiehsanbh1@gmail.com

Thermal Designer

– 2 –

Contents

• Introduction• Different Closed Systems• Hybrid System• Energy and Controlling Model• Case Studies and Results• Conclusion

– 3 –

– 4 –

– 5 –

– 6 –

Introduction

• Cooling traditionally counted for 25-50% of the total energy consumption in a typical base station.

– 7 –

– 8 –

Vapour Compression System

– 9 –

Thermosiphon system

– 10 –

Pump-driven Loop System

– 11 –

Hybrid System

– 12 –

Previous Studies

Air Conditioning

Thermosiphon

– 13 –

Energy Model

INFSOLENVITCOOL QQQQQ

– 14 –

Controlling Model

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

– 15 –

Controlling Model

– 16 –

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

– 17 –

Copenhagen, Denmark

– 18 –

Copenhagen, Denmark (month June)

– 19 –

San Francisco, USA

– 20 –

Shanghai, China

– 21 –

Dubai, UAE

– 22 –

Copenhagen, Denmark

– 23 –

San Francisco, USA

– 24 –

Shanghai, China

– 25 –

Dubai, UAE

– 26 –

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