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2016 | Buch

Introduction Kapitel lesen Erstes Kapitel lesen

Air Flow Management in Raised Floor Data Centers

verfasst von: Vaibhav K. Arghode, Yogendra Joshi

Verlag: Springer International Publishing

Buchreihe : SpringerBriefs in Applied Sciences and Technology

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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Über dieses Buch

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.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction
Abstract
In this chapter we introduce the thermal management aspect of air cooled data centers based on thermodynamics. The energy consumption by various cooling components and the influencing factors are discussed with a view towards minimizing the overall energy expenditure.
Vaibhav K. Arghode, Yogendra Joshi
Chapter 2. Metrology Tools
Abstract
To understand the air flow and thermal field characteristics in a data center it is imperative to experimentally measure the relevant parameters. Here we discuss some metrology tools for thermal and flow measurements relevant to air cooled data centers. The tools discussed here include measurements of tile and rack air flow rates, and flow, thermal, and pressure fields. Both commercially available, and in-house developed tools are discussed.
Vaibhav K. Arghode, Yogendra Joshi
Chapter 3. Cooling Air Delivery Through Perforated Tiles
Abstract
For energy efficient operation, uniform air temperature within the guidelines specified by the American Society of Heating Refrigeration and Air-Conditioning (ASHRAE TC 9.9 2011) at the rack inlet is desired. However, due to mixing with the hot room air, higher temperatures as compared to the supplied air temperature from the floor tiles can be present at the rack inlet, thus lowering the cooling effectiveness (Arghode et al. 2015b). In a raised floor data center, cooling air is supplied from an underfloor pressurized plenum through perforated tiles. Perforated floor tiles can have different geometrical features such as size, porosity, pore size and shape, blocked region at edges where perforations are absent, and anterior structures such as flow guiding fins or dampers for air flow control that can affect the air flow delivery to the adjacent rack, and hence the thermal field uniformity.
Vaibhav K. Arghode, Yogendra Joshi
Chapter 4. Cold Aisle Containment
Abstract
One of the objectives of an effective air flow management scheme is to minimize hot and cold air mixing. Appropriate arrangement of racks, such as hot-aisle-cold-aisle (HACA) partially meets this requirement. However, due to the tendency of entrainment of surrounding room air by emerging cold air stream from perforated tiles, hot and cold air mixing is very difficult to eliminate in open aisle condition. Use of physical barriers, separating the hot and cold regions shows promise to minimize this problem. In this chapter we will discuss the thermal characteristics of contained cold aisles, and their influence on the energy savings of a data center.
Vaibhav K. Arghode, Yogendra Joshi
Chapter 5. Other Air Delivery Schemes
Abstract
While the raised floor HACA layout with peripheral CRAC units discussed in the previous chapters is the most commonly employed one in most legacy, as well as many recently constructed data centers, a growing number of new facilities are employing alternate air delivery approaches. In this chapter we discuss some of these. Figure 5.1 provides a summary of several possible approaches used in data center thermal management. All of these assume local heat rejection from the IT equipment to the data center room air (Evans 2012). The hot room air then transmits heat via multiple possible coolants or interfaces outside the IT facility envelope. An array of options also exists for the ultimate heat rejection to the environment from the intermediate heat transmission devices that transport the heat to outside the data center envelope.
Vaibhav K. Arghode, Yogendra Joshi
Backmatter
Metadaten
Titel
Air Flow Management in Raised Floor Data Centers
verfasst von
Vaibhav K. Arghode
Yogendra Joshi
Copyright-Jahr
2016
Electronic ISBN
978-3-319-25892-8
Print ISBN
978-3-319-25890-4
DOI
https://doi.org/10.1007/978-3-319-25892-8