University of Oulu

Huttunen, J.; Salmela, O.; Volkov, T.; Pongrácz, E. Reducing the Cooling Energy Consumption of Telecom Sites by Liquid Cooling. Proceedings 2020, 58, 19.

Reducing the cooling energy consumption of telecom sites by liquid cooling

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Author: Huttunen, Jari1,2; Salmela, Olli3; Volkov, Topi3;
Organizations: 1Nokia Networks, 90620 Oulu, Finland
2Faculty of Technology, University of Oulu, 90570 Oulu, Finland
3Nokia Bell Labs, 02610 Espoo, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2020
Publish Date: 2022-03-24


The use of mobile data has increased and will continue to increase in the future, because more data is moving to wireless networks such as 5G. Cooling energy need is also expected to increase in indoor telecom rooms, and can be as high as the equipment’s own power consumption. The world’s first liquid Base Transceiver Station (BTS) was adopted into commercial use in 2018, in Helsinki, Finland. Conventional air-cooled BTS hardware was converted into liquid-cooled BTS equipment. Heat from the BTS was pumped out of the site room, and thus ventilation or air conditioning was not needed for the heat load from the BTS. Heat stored in the liquid was released into the ventilation duct of the building, still providing annual cooling energy savings of 70%, when compared to air cooling. In the future, 80% of the total dissipated energy, 13450 kWh/a in total, can potentially be used for heating purposes. In terms of CO₂ emissions, adapting liquid cooling showed an 80% reduction potential when compared to air cooling.

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Series: Proceedings
ISSN: 2504-3900
ISSN-E: 2504-3900
ISSN-L: 2504-3900
Volume: 58
Article number: 19
DOI: 10.3390/WEF-06908
Host publication: Proceedings. The First World Energies Forum—Current and Future Energy Issues. 14 Sept-5 Oct 2020
Conference: World Energies Forum
Type of Publication: A4 Article in conference proceedings
Field of Science: 218 Environmental engineering
Funding: This research received no external funding, but it has been conducted as a normal business relationship between the Elisa Oyj and Nokia Oyj.
Copyright information: © 2020 by the authors. Licensee MDPI, Basel, Sw itzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (