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
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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
24-inch rear door
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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 as long as 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)
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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.
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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
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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 as long as 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)
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