The liquid cooling system consists of the primary side and secondary side.
- The primary side includes the cooling tower and (optional) chiller.
- The secondary side includes a coolant distribute unit (CDU), liquid cooling cabinets, liquid-cooled chassis, and liquid-cooled nodes.
Figure 1-1 and Figure 1-2 show the logical architecture of the full liquid cooling system.
Figure 1-1 Logical architecture (with an external CDU cabinet)![]()
Figure 1-2 Logical architecture (with an internal CDU box)![]()
Table 1-1 Component descriptionNo.
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Component
|
Description
|
|---|
1
|
Cooling tower
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- Dissipates the heat from the liquid loops to the exterior. Generally, it is placed outdoors. The water outlet temperature varies depending on the local temperature. The water outlet temperature range is 5°C to 32°C (41°F to 89.6°F).
- A closed cooling tower is recommended.
|
2
|
Chiller
|
Cools the chilled water.
|
3
|
CDU
|
- Implements flow distribution, pressure control, physical isolation, and condensation prevention for the secondary side. The CDU implements heat dissipation of the components that use direct contact liquid cooling (DCLC) in the cabinet (the heat of high-power CPUs is removed by the liquid cold plates).
- There are two types of CDUs: CDU cabinet and CUD box. The CDU cabinet is installed outside the full liquid cooling cabinet, and the secondary loop is required. The CDU box is installed in the full liquid cooling cabinet with the built-in secondary loop.
|
4
|
Liquid cooling cabinet
|
Provides liquid cooling for the devices in the cabinet. The Huawei full liquid cooling cabinet is designed with a fully enclosed structure, which allows all heat to be removed from the cabinet through chilled water.
|
5
|
Air conditioner
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Dissipates heat for IT cabinets. The Huawei full liquid cooling cabinet can remove all the heat from the cabinet through chilled water. Therefore, most air conditioners can be removed.
|
6
|
Primary side
|
- Circulating water system between the cooling tower and the CDU. It is also called primary loop. The green arrows indicate the inlet water, and yellow arrows indicate the outlet water, as shown in Figure 1-7.
- The water inlet temperature supported by the primary side is 5°C to 32°C (41°F to 89.6°F). In special scenarios, 35°C (95°F) is supported.
NOTE: Special scenarios refer to the scenarios with restrictions on device configurations and environment specifications. For details, contact Huawei engineers.
|
7
|
Secondary side
|
- Circulating water system between the CDU and the cabinet. It is also called secondary loop. When the external cabinet CDU is used, the system is deployed in the equipment room. If the built-in CDU is used, the system is integrated into the cabinet and does not need to be constructed separately. The blue arrows indicate the inlet water, and red arrows indicate the outlet water, as shown in Figure 1-7.
- The maximum water inlet temperature supported by the secondary side is 50°C (122°F).
|
8
|
HEX
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There is one air/liquid heat exchanger on the left and right inside the cabinet. The heat exchangers connect to the primary side pipe and cools the indirectly-cooled components in the liquid-cooled server.
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9
|
Liquid cold plate
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Covers the high-temperature components, such as the processors, and directly removes the heat through water circulation.
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