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By Stuart Crump

The Value of Blanking Plates

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By Stuart Crump

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  1. The Value of Blanking Plates Server equipment will suck the air supply it requires from wherever it can within a facility whether this is from a floor grille or the hot exhaust of other equipment. This presentation demonstrates the effectiveness of use of blanking plates to control the provision of a conditioned air supply to the equipment. By Stuart Crump

  2. Without Blanking Plates With Blanking Plates Blanking Plates 6SigmaRack software is used to predict the inlet temperatures of equipment with & without blanking Isolated racks have been created with & without blanking plates between their equipment. • Both racks have the same equipment with the same power. • Both racks receive the same cooling from the floor grille. The blanked rack receives lower mean inlet temperatures since all of the supplied air is coming directly from the floor grille. The un-blanked rack obtains a portion of its air supply from the equipment exhausts at the rear and therefore receives a higher mean inlet temperature.

  3. Recirculation effects are worsened when the cabinet is installed in an operating environment NET Grille Flow in an Operational Data Centre The ACU is blowing air under these grilles so there is very limited up-flow to the equipment A The following Virtual Facility represents an operational data centre. The net flow through the floor grilles is displayed. • The amount of cooled air from the ACU’s reaching the equipment through the floor grilles varies significantly throughout the facility. • All cabinets contain exactly the same equipment as in the previous isolated scenario and are all un-blanked. • In some areas there is insufficient air to supply the equipment. Equipment will suck in the nearest air that is available regardless of its temperature.

  4. Un-Blanked Cabinet Plane of Temperature through Un-blanked Cabinet There is severe mixing of the hot exhaust air and the cool air front at the equipment inlets Some of the exhaust air is re-circulating into the equipment inlets Streamlines allow it be seen from where equipment gets its air supply • The following cabinet (marked ‘A’ in the previous floor plan) is an example of a cabinet from the fully populated Virtual Facility shown previously. It is completely un-blanked.

  5. Equipment in close proximity to grilles with low flow rates receive hotter air supply 6SigmaRoom is used to show the variation of air supply in one row of a facility’s equipment. • A temperature plane has been placed directly in line with the inlets of the equipment to show the temperature of the air entering each server. • Equipment close to grilles with low flow rates is more likely to draw air from equipment exhausts. • The plane is coloured red in this area indicating the presence of the hot exhaust air close to the shorter arrows.

  6. Blanked Cabinet Plane of Temperature through Blanked Cabinet The exhaust air streamlines are blocked from entering the equipment inlets There is no longer any mixing of the cool air and the hot exhaust air as the re-circulation path has been blocked by the blanking plates. The installation of Blanking Plates prevents recirculation • Cabinet A is now shown after having been its vacant U-slots completely blanked. • The blanking plates block the path of the hot exhaust air preventing it from being recycled.

  7. Blanked Facility Un-Blanked Facility The effect of Installing blanking plates to the vacant U-slots in every cabinet • The thermal situation has been significantly improved by the addition of low cost blanking plates particularly in the areas where the grille supply is low. • Thermal improvements can be noted at the intake of every single cabinet which goes to prove that, even with a very good up-flow from the floor void, a small proportion of exhaust air will still be re-circulated if blanking plates are not utilised.

  8. Future Facilities Ltd. recommends the use of blanking plates when installing new front ventilated cabinets filled with new front ventilated equipment.Installing blanking plates in existing cabinets is beneficial in the majority of situations however Future Facilities recommends the use of 6SigmaRoom & or 6SigmaRack to confirm this before installation. Slide 8

  9. providing design & management software and services for data centre facilities 1 Salamanca Street Albert Embankment London SE1 7HX http://www.futurefacilities.com Tel: +44 (0) 20 7840 9540 Fax: +44 (0) 20 7091 7171

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