Arghode / Joshi Air Flow Management in Raised Floor Data Centers

1. Auflage 2016
ISBN: 978-3-319-25892-8
Verlag: Springer Nature Switzerland
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 90 Seiten

Reihe: SpringerBriefs in Thermal Engineering and Applied Science

The Brief discuss primarily two aspects of air flow management in raised floor data centers. Firstly, cooling air delivery through perforated tiles will be examined and influence of the tile geometry on flow field development and hot air entrainment above perforated tiles will be discussed. Secondly, the use of cold aisle containment to physically separate hot and cold regions, and minimize hot and cold air mixing will be presented. Both experimental investigations and computational efforts are discussed and development of computational fluid dynamics (CFD) based models for simulating air flow in data centers is included. In addition, metrology tools for facility scale air velocity and temperature measurement, and air flow rate measurement through perforated floor tiles and server racks are examined and the authors present thermodynamics-based models to gauge the effectiveness and importance of air flow management schemes in data centers.

Autoren/Hrsg.

Arghode, Vaibhav K.

Joshi, Yogendra

Inhaltsverzeichnis

1;Preface;6
2;Acknowledgments;8
3;Contents;10
4;List of Tables;12
5;List of Figures;14
6;Nomenclature;18
7;Chapter 1: Introduction;22
7.1;1.1 Data Centers;22
7.2;1.2 Energy Usage Analysis of a Raised Floor Data Center;24
7.3;1.3 Thermodynamics of Data Center Cooling;27
8;Chapter 2: Metrology Tools;32
8.1;2.1 Tile Air Flow Rate Measurement;32
8.1.1;2.1.1 Commercial Flow Hood;33
8.1.2;2.1.2 Operating Principle of Flow Hood for Passive Tiles;33
8.1.3;2.1.3 Operating Principle of Flow Hood for Active Tiles;35
8.2;2.2 Rack Air Flow Rate Measurement;37
8.2.1;2.2.1 In-house Developed Tool;38
8.2.2;2.2.2 Tool Resistance Compensation;38
8.3;2.3 Flow Field Measurement;42
8.3.1;2.3.1 Particle Image Velocimetry (PIV) Technique;42
8.3.2;2.3.2 Principle of PIV Technique;42
8.3.3;2.3.3 PIV System at the Data Center Laboratory, Georgia Tech;43
8.4;2.4 Thermal Field Measurement;44
8.5;2.5 Pressure Measurement;45
8.5.1;2.5.1 Mass Flow Based Pressure Sensor;46
8.5.2;2.5.2 Piezoresistive Pressure Sensor;47
9;Chapter 3: Cooling Air Delivery Through Perforated Tiles;48
9.1;3.1 Experimental Investigation;49
9.1.1;3.1.1 Experimental Setup;49
9.1.2;3.1.2 Cases Investigated;51
9.1.3;3.1.3 Effect of Tile Porosity;52
9.1.4;3.1.4 Effect of Tile Pore Size;52
9.1.5;3.1.5 Effect of Blocked Edges;53
9.1.6;3.1.6 Effect of Tile Width;53
9.2;3.2 Computational Fluid Dynamics (CFD) Modeling;54
9.2.1;3.2.1 Porous Jump Model (PJ);54
9.2.2;3.2.2 Body Force Model (BF);56
9.2.3;3.2.3 Modified Body Force Model (MBF);56
9.2.4;3.2.4 Computational Set-Up;59
9.2.5;3.2.5 Base Case;60
9.2.6;3.2.6 Effect of Tile Pore Size Captured by MBF Model;60
9.2.7;3.2.7 Effect of Tile Porosity Captured by MBF Model;61
9.2.8;3.2.8 Effect of Edge Blockage Captured by MBF Model;61
9.2.9;3.2.9 Small Pore Sizes and a Note on Computational Effort Using MBF Model;62
10;Chapter 4: Cold Aisle Containment;65
10.1;4.1 Aisle Containment;65
10.2;4.2 Experimental Setup;66
10.3;4.3 Experimental Results;68
10.3.1;4.3.1 Tile/Rack Air Flow Rate, Plenum Pressure for Passive Tiles;68
10.3.2;4.3.2 Thermal Field;71
10.3.3;4.3.3 Server Inlet Temperature;73
10.3.4;4.3.4 Energy Consumption;74
11;Chapter 5: Other Air Delivery Schemes;78
11.1;5.1 Raised Floor Versus Non Raised Floor Layout;78
11.2;5.2 Ceiling Delivery of Cold Air with Perimeter CRAC Layout;79
11.3;5.3 Close Coupled Cooling;81
11.3.1;5.3.1 In-row Cooling;81
11.4;5.4 Free Air Cooling;82
11.5;5.5 Cooling with a Regenerative Heat Exchanger;83
12;References;86
13;Index;89