Chapter 5. Rack planning 141
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.
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