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Attention:
1. Because of the size and weight of the heat exchanger, three trained persons
2. You must remove the power from the rack and all components before you
Heat exchanger specifications
The following information is a summary of the specifications of the IBM Rear Door
Heat eXchanger V2, Type 1756.
Heat exchanger performance
Expected performance of the heat exchanger is illustrated in Figure 2 on page 7 for
a typical inlet air temperature of 27°C (80.6°F), with a fully populated rack, near
uniform power dissipation, and a 30 kW heat load. By selecting the correct water
inlet temperature and water flow rate, you can achieve the necessary heat removal.
A heat removal of 100% indicates that an amount of heat equivalent to that
generated by the devices has been removed by the heat exchanger and the
average air temperature leaving the heat exchanger is identical to that entering the
rack (27°C [80.6°F] in this example). Heat removal in excess of 100% indicates that
the heat exchanger not only removed all of the heat generated by the devices but
further cooled the air so that the average air temperature leaving the rack is actually
lower than that entering the rack.
6
Rear Door Heat eXchanger V2: Installation and Maintenance Guide
are required to install or remove the heat exchanger.
connect or disconnect the water supply lines and drain or fill the heat
exchanger.
Table 1. Heat exchanger specifications
Door size:
v Depth: 129 mm (5.0 in.)
v Height: 1950 mm (76.8 in.)
v Width: 600 mm (23.6 in.)
Door assembly weight:
v Empty: 39 kg (85 lb)
v Filled: 48 kg (105 lb)
Air movement:
v Provided by servers and other devices in
the rack
Air Temperature drop:
v With high-heat-load devices, up to 25°C
(45°F) between the air exiting the rack
devices and the air exiting the heat
exchanger
Water:
v Source:
– User-supplied, compliant with
specifications in this document
v Pressure:
– Normal operation: <137.93 kPa (20 psi)
– Maximum: 689.66 kPa (100 psi)
v Volume:
–
Approximately 9 liters (2.4 gallons)
v Temperature:
– Above dew point
– 18°C ±1°C (64.4°F ±1.8°F) for
ASHRAE Class 1 Environment
– 22°C ±1°C (71.6°F ±1.8°F) for
ASHRAE Class 2 Environment
Note: See "Heat exchanger
performance" for more information.
v Required water flow rate (as measured
at the supply entrance to the heat
exchanger)
– Minimum: 22.7 liters (6 gallons) per
minute
– Maximum: 56.8 liters (15 gallons) per
minute
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