Controlled Direct Liquid Cooling of Data Servers

Document identifier: oai:DiVA.org:ltu-75905
Access full text here:10.1109/TCST.2019.2942270
Keyword: Engineering and Technology, Electrical Engineering, Electronic Engineering, Information Engineering, Control Engineering, Teknik och teknologier, Elektroteknik och elektronik, Reglerteknik, Controlled liquid cooling, Data server thermal management, Direct liquid cooling, Dynamical cooling management, Heat recovery
Publication year: 2020
Abstract:

We formulate a modeling and control framework aimed at direct liquid cooling of data servers. In our application scenario, the server's heat load is rejected into a liquid cooling circuit that extends to individual chips. We start with a comprehensive discussion of our modeling derivations. We then show how to dynamically provision the coolant, while 1) regulating the temperatures of any self-heating components within the safe operational envelope; 2) minimizing the coolant supply cost; and 3) increasing the server outflow temperature (a key performance objective toward heat recovery systems). We confirm experimentally the benefits of the proposed controlled cooling strategy over several realistic scenarios corresponding to different inlet coolant temperatures and computational loads.

Authors

Riccardo Lucchese

Luleå tekniska universitet; Signaler och system
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Damiano Varagnolo

Department of Engineering Cybernetics, Norwegian University of Science and Technology, 7034 Trondheim, Norway
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Andreas Johansson

Luleå tekniska universitet; Signaler och system
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