IBM NeXtScale System, Планирование и руководство по внедрению

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Chapter 5. Rack planning
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5.5 Rear Door Heat Exchanger
There is a Rear Door Heat Exchanger available for the IBM 42U 1100mm
Enterprise V2 Dynamic Rack. It has the following features:
򐂰
It attaches in place of the perforated rear door and adds 100 mm, which
makes the overall package 1200 mm (the depth of two standard data center
floor tiles).
򐂰 The doors use 3/4-inch quick connect couplers, which include automatic
valves that restrict water leakage (often a few drops at most) when the doors
are connected or disconnected.
򐂰
Each door has a capacity of 9 liters (2.4 US gallons), and supports flow rates
of 22.7 liters (6 US gallons) to 56.8 liters (15 US gallons) per minute.
򐂰 The doors have no moving parts; the fans in the equipment move air though
the heat exchanger as easily as a standard rack door.
If the water flow is disrupted, the rack reverts to standard air cooling.
򐂰 Each door can remove 100% of the heat that is generated by servers that use
30 kW of power and 90% of the heat that is generated by servers that use
40 kW. It removes the heat by using 18° C (64° F) water at a 27° C (81° F)
server inlet air temperature.