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Energy savings in data centers: A framework for modelling and control of servers’ cooling
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0002-7443-8174
Luleå tekniska universitet.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0001-8235-9639
ABB Corporate Research, Västerås.
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2017 (Engelska)Ingår i: IFAC-PapersOnLine, ISSN 1045-0823, E-ISSN 1797-318X, Vol. 50, nr 1, s. 9050-9057Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Aiming at improving the energy efficiency of air cooled servers in data centers, we devise a novel control oriented, nonlinear, thermal model of the servers that accounts explicitly for both direct and recirculating convective air flows. Instrumental to the optimal co-design of both geometries and cooling policies, we propose an identification methodology based on Computational Fluid Dynamics (CFD) for a generic thermal network of m fans and n electronic components. The performance of the proposed modelling framework is validated against CFD measurements with promising results. We formalize the minimum cooling cost control problem as a polynomially constrained Receding Horizon Control (RHC) and show, in-silico, that the resulting policy is able to efficiently modulate the cooling resources in spite of the unknown future computational and electrical power loads.

Ort, förlag, år, upplaga, sidor
Elsevier, 2017. Vol. 50, nr 1, s. 9050-9057
Nationell ämneskategori
Reglerteknik Strömningsmekanik och akustik
Forskningsämne
Reglerteknik; Strömningslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-66199DOI: 10.1016/j.ifacol.2017.08.1624ISI: 000423965100009Scopus ID: 2-s2.0-85031817824OAI: oai:DiVA.org:ltu-66199DiVA, id: diva2:1150711
Konferens
20th IFAC World Congress, Toulouse, France, 9-14 July 2017
Anmärkning

Konferensartikel i tidskrift

Tillgänglig från: 2017-10-19 Skapad: 2017-10-19 Senast uppdaterad: 2019-09-09Bibliografiskt granskad
Ingår i avhandling
1. Cooling Control Strategies in Data Centers for Energy Efficiency and Heat Recovery
Öppna denna publikation i ny flik eller fönster >>Cooling Control Strategies in Data Centers for Energy Efficiency and Heat Recovery
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Kylreglerstrategier i datacenter för energieffektivitet och värmeåtervinning
Abstract [en]

Data centers are facilities dedicated to the processing, storage, and relay of large amounts of digital information. As a whole, it is an energy intensive industry, characterized by a sizable carbon footprint and a short-term exponential growth rate. At a macroscopic level, their operation requires balancing the offer and demand of computational, cooling, and electrical power resources. The computational workload is influenced by external factors such as the end-users’ activity, while the overall run-time costs depend on the weather conditions and the fluctuating pricing of electricity. In this context, the adoption of optimizing control strategies and co-design methodologies that address simultaneously both the mechanical and control aspects, has the potential to unlock more sustainable designs. Improvements in the overall energetic efficiency open to larger-scale deployments in less favorable geographical locations. Recovery systems addressing the vast amounts of by-product heat can support other heat intensive processes such as district networks, wood drying, greenhouses, and food processing. This work focuses on how to adapt the provisioning of the cooling resources to the cooling demand, without negotiating the computational throughput. We devise top-down designs, that address unexplored control possibilities in existing deployments. We moreover apply a bottomup perspective, by modeling and studying co-designed cooling setups which bring significant simplifications to data center level optimal provisioning problems. The analysis aims at the different levels of the data center infrastructure hierarchy, and provides answers to centerpiece questions such as i) what are the optimal flow provisioning policies at different levels of the data centers?; ii) how to design simple but effective control strategies that address the complexity induced by the large scales?; iii) what are the exhaust heat properties that can be expected in air-cooled and liquid-cooled data centers?. Exploiting a model-centric approach we demonstrate the effectiveness of tailored control strategies in both achieving better cooling efficiency and a higher quality of the heat harvest. This thesis presents opportunities to simplify data center control structures while retaining or improving their performance. Furthermore, it lays modeling and control methodologies toward the holistic control-oriented treatment of the computing, cooling, and power distribution infrastructures. The results have a practical character and the model-based analysis establishes important development directions, confirming existing trends. Enabling intelligent data center management systems might not need to imply more complex tools; rather, a co-design effort might yield both simpler and effective control systems.

Ort, förlag, år, upplaga, sidor
Luleå University of Technology, 2019
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nationell ämneskategori
Reglerteknik
Forskningsämne
Reglerteknik
Identifikatorer
urn:nbn:se:ltu:diva-75917 (URN)978-91-7790-437-3 (ISBN)978-91-7790-438-0 (ISBN)
Disputation
2019-11-05, A1545, Luleå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-09-10 Skapad: 2019-09-09 Senast uppdaterad: 2019-10-16Bibliografiskt granskad

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Lucchese, RiccardoLjung, Anna-LenaVaragnolo, Damiano

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Signaler och systemLuleå tekniska universitetStrömningslära och experimentell mekanik
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Totalt: 286 träffar
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