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

By Vaibhav K. Arghode, Yogendra Joshi

ISBN-10: 3319258907

ISBN-13: 9783319258904

The short talk about essentially features of ventilation administration in raised ground facts facilities. first of all, cooling air supply via perforated tiles could be tested and impression of the tile geometry on move box improvement and scorching air entrainment above perforated tiles might be mentioned. Secondly, using chilly aisle containment to bodily separate cold and hot areas, and reduce cold and hot air blending could be provided. either experimental investigations and computational efforts are mentioned and improvement of computational fluid dynamics (CFD) established versions for simulating ventilation in info facilities is incorporated. additionally, metrology instruments for facility scale air speed and temperature size, and ventilation price size via perforated flooring tiles and server racks are tested and the authors current thermodynamics-based types to gauge the effectiveness and significance of ventilation administration schemes in info centers.

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In this case, the pressure loss through a restriction is proportional to the specific kinetic energy of the air flow. 5ρV2) (Freid and Idelchik 1989). Miller (1990) suggested that for Re > 103, the effect of Re is absent on K, which is applicable for flow through perforated tile in data centers (Re > 104). Note that the Re is based on the pore diameter and the average flow approach velocity. In the system for tile air flow rate measurement using Flow Hood, there are three different resistance levels involved, which result in three different air flow rates.

2013a; Nelson 2007). The average fan speed for different dial settings was measured using an optical tachometer and the results are shown in Fig. 7b. Here we have only considered dial settings from 5 to 10, which correspond to average fan speed of 49–100 %. 5 %. The non-uniformity among the 16 fans for the same dial setting for all four server simulators is ±10 %. The measured differential pressures across the server simulator rack and the corresponding air flow rates are presented in Fig. 8a. The axes are scaled according to the fan laws for different fan speeds, or dial settings (Bleier 1997).

For illustration purposes the passive tile corresponds to the active tile without the fans, see Fig. 3b, c. We assume that the pressure profile generated by the fans with respect to the air flow rate, or the fan curve, is represented by ΔPn. The system characteristic for the active tile is given by ΔPt,a = ΔPt,s − ΔPn, where ΔPt,s is the system curve or pressure loss characteristic for the active tile without the fans, essentially a passive tile, see Fig. 3a. Note that, for the passive tile the air flow rate is zero for zero differential pressure (Pp − Pm).

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