Premnath, R; Dr.Madhu, G(Cochin University of Science and Technology, November , 2011)
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Abstract:
This work identifies the importance of plenum pressure on the performance
of the data centre. The present methodology followed in the industry considers the
pressure drop across the tile as a dependant variable, but it is shown in this work
that this is the only one independent variable that is responsible for the entire flow
dynamics in the data centre, and any design or assessment procedure must consider
the pressure difference across the tile as the primary independent variable. This
concept is further explained by the studies on the effect of dampers on the flow
characteristics. The dampers have found to introduce an additional pressure drop
there by reducing the effective pressure drop across the tile. The effect of damper is
to change the flow both in quantitative and qualitative aspects. But the effect of
damper on the flow in the quantitative aspect is only considered while using the
damper as an aid for capacity control. Results from the present study suggest that
the use of dampers must be avoided in data centre and well designed tiles which
give required flow rates must be used in the appropriate locations.
In the present study the effect of hot air recirculation is studied with suitable
assumptions. It identifies that, the pressure drop across the tile is a dominant
parameter which governs the recirculation. The rack suction pressure of the
hardware along with the pressure drop across the tile determines the point of
recirculation in the cold aisle. The positioning of hardware in the racks play an
important role in controlling the recirculation point. The present study is thus
helpful in the design of data centre air flow, based on the theory of jets. The air
flow can be modelled both quantitatively and qualitatively based on the results.
Description:
Division of Safety and Fire Engineering,
School of Engineering, Cochin University of Science and Technology