Research Papers

Airflow Management on the Efficiency Index of a Container Data Center Having Overhead Air Supply

[+] Author and Article Information
Cheng-Hao Wang, Yeng-Yung Tsui

Department of Mechanical Engineering,
National Chiao Tung University,
Hsinchu 300, Taiwan

Chi-Chuan Wang

Department of Mechanical Engineering,
National Chiao Tung University,
Hsinchu 300, Taiwan
e-mail: ccwang@mail.nctu.edu.tw

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received July 14, 2017; final manuscript received September 24, 2017; published online October 23, 2017. Assoc. Editor: Baris Dogruoz.

J. Electron. Packag 139(4), 041008 (Oct 23, 2017) (10 pages) Paper No: EP-17-1066; doi: 10.1115/1.4038114 History: Received July 14, 2017; Revised September 24, 2017

Effect of airflow managements on the efficiency index of a small container data center having overhead air supply is reported in this study. Seventeen arrangements and configurations regarding the airflow and blockage arrangements are experimentally examined and compared. Test results indicate an appreciable hot air recirculation occurring for rack arrangement without any blockage, and the hot spot occurs at the second rack alongside the cold aisle. The hot spot had moved to the first rack when the blockage plate is installed on the rack top. Rack locations relative to air handler casts a negligible effect on the efficiency index, and it is comparatively more effective by sealing the trailing of the cold aisle. A smaller cold-aisle spacing helps to lower the temperature distribution, and an additional opening of the supplied vent will not help in removal of hot spot. Shutting off the grille in the center of cold aisle is also unable to fix the hot air recirculation and may even incur hot air reversal. The hot air reversal can be removed by adding additional blockage plate at the flow reversal section. Higher supplied air flow rate also improves the efficiency index considerably.

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Fig. 1

Schematic of the experimental setup and detailed dimensions of the test simulation data center and the heaters contained in the data rack: (a) schematic of data center system and chilling utility layout, (b) top view of the container data center, (c) side view of the container data center, and (d) photo for the data rack with equally divided heater in five parts

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Fig. 2

Measured temperature contour plot for cases 1–17: (a) case 1, (b) case 2, (c) case 3, (d) case 4, (e) case 5, (f) case 6, (g) case 7, (h) case 8, (i) case 9, (j) case 10, (k) case 11, (l) case 12, (m) case 13, (n) case 14, (o) case 15, (p) case 16, and (q) case 17

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Fig. 3

Measured RCI and SHI for cases 1 and 2

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Fig. 4

Measured RCI and SHI for cases 2–4

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Fig. 5

Measured RCI and SHI for cases 5, 6, 3, 7, and 8

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Fig. 6

Measured RCI and SHI for cases 3, 9, 10, and 11

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Fig. 7

Measured RCI and SHI for cases 11–14

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Fig. 8

Measured RCI and SHI for cases 15, 3, 16, and 17



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