Download Air Flow Management in Raised Floor Data Centers by Vaibhav K. Arghode, Yogendra Joshi PDF

By Vaibhav K. Arghode, Yogendra Joshi

The short speak about essentially features of ventilation administration in raised ground info facilities. to begin with, cooling air supply via perforated tiles could be tested and impact of the tile geometry on stream box improvement and sizzling air entrainment above perforated tiles might be mentioned. Secondly, using chilly aisle containment to bodily separate cold and hot areas, and reduce cold and warm air blending might be offered. either experimental investigations and computational efforts are mentioned and improvement of computational fluid dynamics (CFD) dependent versions for simulating ventilation in facts facilities is integrated. additionally, metrology instruments for facility scale air speed and temperature dimension, and ventilation cost size via perforated ground tiles and server racks are tested and the authors current thermodynamics-based types to gauge the effectiveness and value of ventilation administration schemes in info centers.

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This technique has been successfully demonstrated for range of velocities from natural convection to supersonic speeds, and for micro to macro length scales. It may be noted that the air velocities encountered in a data center are generally less than 10 m/s, however, the overall length scale of the flow of interest is large (few meters). The advantage of using PIV technique, as compared to point by point velocity measurement techniques such as laser Doppler velocimetry (LDV) or hot wire anemometry, is measurement of a spatially resolved flow field at an instant of time.

For some studies requiring finer spatial resolution, another planar temperature field measurement tool was developed, see Fig. 10b. ). The construction of the tool also allows minimal physical intrusion during measurements. For a steady state experiment, the data is generally recorded for 30 s, with a sampling rate of 1 s, and the average data is reported. A time delay of 5 min is generally used for the flow field to stabilize after moving the tool to a new location. Note that this tool has also been useful in transient thermal field characterization apart from steady state experiments.

The driving potential for all three cases is the difference between the plenum (Pp) and the room pressure (Pm). We assume that Fig. 2 Air flow rate measurement analysis for passive tiles using Flow Hood. (a) Representation of air flow system in three different flow resistances. (b) Formulation of the air flow system in three different flow resistances (source: Arghode et al. 2015a). 1 Variables associated with the air flow rate measurement formulation for Flow Hood (source: Arghode et al. 2015a).

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