Heat exchanger specifications

Heat exchanger specifications provide detailed information for your heat exchanger, including dimensions, weight, air source, water source, water pressure, and water volume.

The following tables show the specifications for the heat exchanger.

Table 1. Operating specifications for 19-inch EIA-rail heat exchanger
Specifications Specifications (continued) Specifications (continued)
Door size
  • Depth: 142.6 mm (5.6 in.)
  • Height: 1945.4 mm (76.6 in.)
  • Width: 639 mm (25.2 in.)
Exchanger size
  • Depth: 67 mm (2.6 in.)
  • Height: 1791.3 mm (70.5 in.)
  • Width: 438.6 mm (17.3 in.)
Door assembly weight
  • Empty: 29.9 kg (66 lb)
  • Filled: 35.6 kg (78.5 lb)
Door heat removal capacity
  • For examples of door heat removal capacity, see the illustrations in Heat exchanger performance.
  • In general, the door heat removal capacity percentage increases if one or more of the following events occur:
    • The water temperature decreases.
    • The water flow increases.
    • The server heat loads decrease.
  • The door heat removal capacity varies with water temperature, water flow rate, air temperature and flow, and total heat load of the servers. However, a typical high-load cabinet (20 - 32 kW or approximately 70 000 - 105 000 Btu per hour) can achieve 55 - 85% heat removal.
Air movement
  • Provided by servers and other devices in the rack
Air source for servers
  • Room air for front of rack. Air exhausts servers, moves through rear door heat exchanger and exits into the room (open loop)
Air temperature drop
  • The temperature drop can be up to 25°C (45°F) between the air that exits the rack devices and the air that exits the heat exchanger on high heat load products.
Air impedance
  • Air pressure drop across the heat exchanger is equivalent to the IBM® acoustic 19-inch rear door.
Water source
  • User-supplied, compliant with specifications in this topic.
Water pressure
  • Normal operation: 137.93 kPa (20 psi)
  • Maximum: 689.66 kPa (100 psi)
  • Pressure drop across heat exchanger: approximately 48 kPa (7 psi)
Water volume
  • Exchanger: 2.8 liters (0.75 gallons)
  • Exchanger plus supply and return hoses to the pump unit: Maximum of approximately 15.1 liters (4.0 gallons) excluding pump unit piping and reservoir
Water temperature
  • If no dew point control is available from the secondary loop cooling distribution unit, 18°C +/- 1 degree C (64.4°F +/- 1.8°F) must be maintained.
  • Lower temperature water is allowed if the water supply is monitored and adjusted to remain above room dew point (where heat exchanger is located).
Required water flow rate (as measured at the supply entrance to the heat exchanger)
  • Minimum: 22.7 liters per minute (6 gallons per minute)
  • Maximum: 37.9 liters per minute (10 gallons per minute)
Table 2. Operating specifications for 24-inch EIA-rail heat exchanger
Specifications Specifications (continued) Specifications (continued)
Door size
  • Depth: 142.6 mm (5.6 in.)
  • Height: 1945.4 mm (76.6 in.)
  • Width: 771.8 mm (30.4 in.)
Exchanger size
  • Depth: 67 mm (2.6 in.)
  • Height: 1791.3 mm (70.5 in.)
  • Width: 574.6 mm (22.6 in.)
Door assembly weight
  • Empty: 31.7 kg (70 lb)
  • Filled: 39.9 kg (88.2 lb)
Door heat removal capacity
  • Lab tests indicate 10 percent improvement over the 19-inch version of the door.
  • Up to 17 kW (58 000 Btu/hr) heat removal possible
Air movement
  • Provided by servers and other devices in the rack
Air source for servers
  • Room air for front of rack. Air exhausts servers, moves through rear door heat exchanger and exits into the room (open loop)
Air temperature drop
  • The temperature drop can be up to 25°C (45°F) between the air that exits the rack devices and the air that exits the heat exchanger on high heat load products.
Air impedance
  • Air pressure drop across the heat exchanger is equivalent to the IBM acoustic 24-inch rear door
Water source
  • User-supplied, compliant with specifications in this topic.
  • 3/4-inch couplings on floor
  • Minimum 3/4-inch inside diameter hose required
Water pressure
  • Normal operation: 137.93 kPa (20 psi)
  • Maximum: 689.66 kPa (100 psi)
  • Pressure drop across heat exchanger: approximately 48 kPa (7 psi)
Water volume
  • Exchanger: 5.3 liters (1.4 gallons)
  • Exchanger plus supply and return hoses to the pump unit: Maximum of approximately 15.1 liters (4.0 gallons) excluding pump unit piping and reservoir
Water temperature
  • If no dew point control is available from the secondary loop cooling distribution unit, 18°C +/- 1 degree C (64.4°F +/- 1.8°F) must be maintained.
  • Lower temperature water is allowed if the water supply is monitored and adjusted to remain above room dew point (where heat exchanger is located).
Required water flow rate (as measured at the supply entrance to the heat exchanger)
  • Minimum: 22.7 liters per minute (6 gallons per minute)
  • Maximum: 37.9 liters per minute (10 gallons per minute)
Door size
  • Depth: 142.6 mm (5.6 in.)
  • Height: 1945.4 mm (76.6 in.)
  • Width: 639 mm (25.2 in.)
Exchanger size
  • Depth: 67 mm (2.6 in.)
  • Height: 1791.3 mm (70.5 in.)
  • Width: 438.6 mm (17.3 in.)
Door assembly weight
  • Empty: 29.9 kg (66 lb)
  • Filled: 35.6 kg (78.5 lb)
Door heat removal capacity
  • For examples of door heat removal capacity, see the illustrations in Heat exchanger performance.
  • In general, the door heat removal capacity percentage increases if one or more of the following events occur:
    • The water temperature decreases.
    • The water flow increases.
    • The server heat loads decrease.
  • The door heat removal capacity varies with water temperature, water flow rate, air temperature and flow, and total heat load of the servers. However, a typical high-load cabinet (20 - 32 kW or approximately 70 000 to 105 000 Btu per hour) can achieve 55 - 85% heat removal.
Air movement
  • Provided by servers and other devices in the rack
Air source for servers
  • Room air for front of rack. Air exhausts servers, moves through rear door heat exchanger and exits into the room (open loop)
Air temperature drop
  • The temperature drop can be up to 25°C (45°F) between the air exiting the rack devices and the air exiting the heat exchanger on high heat load products.
Air impedance
  • Air pressure drop across the heat exchanger is equivalent to the IBM acoustic 19-inch rear door
Water source
  • User-supplied, compliant with specifications in this topic.
Water pressure
  • Normal operation: 137.93 kPa (20 psi)
  • Maximum: 689.66 kPa (100 psi)
  • Pressure drop across heat exchanger: approximately 48 kPa (7 psi)
Water volume
  • Exchanger: 2.8 liters (0.75 gallons)
  • Exchanger plus supply and return hoses to the pump unit: Maximum of approximately 15.1 liters (4.0 gallons) excluding pump unit piping and reservoir
Water temperature
  • If no dew point control is available from the secondary loop cooling distribution unit, 18°C +/- 1 degree C (64.4°F +/- 1.8°F) must be maintained.
  • Lower temperature water is allowed if the water supply is monitored and adjusted to remain above room dew point (where heat exchanger is located).
Required water flow rate (as measured at the supply entrance to the heat exchanger)
  • Minimum: 22.7 liters per minute (6 gallons per minute)
  • Maximum: 37.9 liters per minute (10 gallons per minute)

Heat exchanger option kit

The heat exchanger feature kit consists of the components that are listed below and shown in the following figures.

  • Door assembly
  • Hinge kit
  • Air-purge tool
Figure 1. Components of the heat exchanger kit for 19-inch EIA-rail racks
Illustration of the heat exchanger option kit for 19-inch racks
Figure 2. Components of the heat exchanger kit for 24-inch EIA-rail racks
Illustration of the heat exchanger option kit for 24-inch racks