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Reduced Rack Exhaust Temperature Gradient via Variable Chassis Flow Rate

[+] Author Affiliations
Thong Dang, Carine Serreli, H. Ezzat Khalifa

Syracuse University, Syracuse, NY

Roger R. Schmidt, Madhusudan Iyengar

IBM Corporation, Poughkeepsie, NY

Paper No. IPACK2011-52067, pp. 451-459; 9 pages
doi:10.1115/IPACK2011-52067
From:
  • ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems
  • ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 2
  • Portland, Oregon, USA, July 6–8, 2011
  • ISBN: 978-0-7918-4462-5
  • Copyright © 2011 by ASME

abstract

An effective method of reducing the temperature gradient in data centers (or “hot” and “cold” spots) is to minimize the maximum temperature at the rack exit plane. For a given rack’s heat load, one way to achieve this is to vary the chassis flow rate in such a way that the rack exit temperature gradient is small. In this paper, a simple algorithm based on the energy equation is developed to set the chassis flow rate such that the exit rack temperature is uniform. When compared to a constant chassis flow rate algorithm, the proposed method is demonstrated through CFD simulations to achieve significant reduction in maximum chassis inlet temperature for the same CRAH flow rate.

Copyright © 2011 by ASME

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