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Rear Door Heat eXchanger for 48U Rack

See this topic to learn about parts of ThinkSystem Rear Door Heat eXchanger for 48U Rack.

Figure 1. ThinkSystem Rear Door Heat eXchanger for 48U Rack components

Table 1. Rear Door Heat eXchanger components
1 Rear Door Heat eXchanger assembly7 Lift handles
2 Air-purging valve8 Lift handle
3 Air-purging tool9 Serial number
4 Door latch10 Lift handle
5 Latch plate11 Lower air baffle
6 Hinge kit12 Upper air baffle

For setup and installation, see Set up Rear Door Heat eXchanger for 48U Rack.

Specifications​

Dimension
  • Depth: 496 mm / 19.5 inches
  • Height: : 2275 mm / 89.6 inches
  • Width: 725 mm / 28.5 inches
WeightEmpty: 49 kg / 103.6 lbs
Air movementProvided by servers and other devices in the rack
Air temperature dropWith 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

  • Source

    User-supplied, compliant with specifications in this document

  • Pressure

    • Normal operation: <137.93 kPa (20 psi)
    • Maximum: 689.66 kPa (100 psi)

  • Volume

    Approximately 9 liters (2.4 gallons)

  • 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.

  • 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

Heat exchanger performance​

The following figure illustrates the diagram of rack air flow and heat exchanger water flow.

Figure 2. Diagram of rack air flow and heat exchanger water flow

Expected performance of the heat exchanger is illustrated in the following figures for 25°C (77°F) rack entering air temperature and typical rack air flow of 3840SCFM and 4800SCFM. By selecting the correct rack power, water inlet temperature, you can achieve the water flow rate (lpm) for 100% heat removal. Water flow rate (lpm) for 100% heat removal 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 (25°C /77°F in this example).

Figure 3. Typical performance of the heat exchanger, 3840SCFM Rack air flow, 25°C Rack entering temperature

Heat removal as function of water inlet temperature and water flow rate for the given rack entering air temperature and air flow rate.



Figure 4. Typical performance of the heat exchanger, 4800SCFM Rack air flow, 25°C Rack entering temperature

Heat removal as function of water inlet temperature and water flow rate for the given rack entering air temperature and air flow rate.