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research-article

Effectiveness of Rack-Level Fans: Part II - Control Strategies and System Redundancy

[+] Author and Article Information
John Edward Fernandes

University of Texas at Arlington P.O. Box 19023 Arlington, TX, 76013
john.fernandes@mavs.uta.edu

Richard Eiland

University of Texas at Arlington P.O. Box 19023 Arlington, TX, 76013
richard.eiland@mavs.uta.edu

Bharath Nagendran

Amazon Lab 126 Thermal Engineer Enterprise Way Sunnyvale, CA, 94089
bhanagen@amazon.com

Veerendra Mulay

Facebook Inc. Senior R&D Engineer Menlo Park, CA, 425081
vmulay@fb.com

Dereje Agonafer

ASME Fellow University of Texas at Arlington P.O. Box 19023 Arlington, TX, 76013
agonafer@uta.edu

1Corresponding author.

ASME doi:10.1115/1.4038014 History: Received February 19, 2017; Revised September 21, 2017

Abstract

Fan efficiency is known to increase with size. In Part I of this study, savings in server fan power on the order of 50% were reported by replacing server-enclosed 60 mm fans with a rear-mounted wall of larger fans (80mm or 120mm in size). A methodology for row-wise control of such rack-level fans, with the purpose of simulating an actual product, is previewed and savings comparable to Part I are reported. Performance under real-life scenarios such a non-uniform computational loads and fan failure is investigated. Each rack-level setup has distinct advantages. Selecting between configurations would necessitate a compromise between efficiency, redundancy and cost.

Copyright (c) 2017 by ASME
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