2025-11-11
What is a Cold Aisle?
Definition: The cold aisle is a core form of server rack arrangement and airflow organization in a data center. By enclosing or semi - enclosing specific areas, the cold air delivered by the air conditioner is concentrated and directed to the air - intake side of the servers, preventing the mixing of hot and cold air and achieving "precise cooling and efficient heat dissipation".
|
Items |
Traditional Machine Room |
Cold Aisle Solution |
|
Air |
There is disorderly mixing of hot and cold air. |
Directional airflow with hot - cold isolation |
|
Power Usage Effectiveness(PUE) |
1.5-2.0 |
1.2-1.4(decrease 20%-30%) |
|
Heat dissipation efficiency |
30%-40% |
60%-70% |
|
Cabinet density |
≤8kW / cabinet |
10-20kW / cabinet |
Core Principles and Airflow Logic
Cabinet Arrangement Basis: Server cabinets are arranged in a "front - to - front, back - to - back" pattern
1. Front - to - Front Side: It forms the "cold aisle" (the air - intake side of the servers faces this aisle).
2. Back - to - Back Side: It forms the "hot aisle" (the exhaust side of the servers faces this aisle).
Product Parameters
Basic Design Parameters
|
Items |
Recommended range |
Standard |
|
Cold Aisle Temperature |
18-24℃ |
Optimal inlet air temperature for servers as per the ASHRAE standard |
|
Cold Aisle Humidity |
40%-60% |
Avoid condensation and static electricity |
|
Aisle Width |
1.2-1.5 meters |
The passage of maintenance personnel and the uniform distribution of airflow |
|
Air Supply Velocity |
0.3-0.5m/s |
If the velocity is too low, heat accumulation is likely to occur; if it is too high, energy consumption will increase |
|
Cold/Hot Aisle Pressure Difference |
5-10Pa |
Avoid hot air into cold aisle |
Product Structure
Core Advantages and Value
1.Ultimate Energy Conservation, Reducing PUE
In traditional machine rooms, the PUE is 1.5 - 2.0, while with the cold aisle solution, it can be reduced to 1.2 - 1.4. Taking a 1000kW data center as an example:
When the PUE drops from 1.5 to 1.2, the annual electricity cost savings = 1000 × 8760 × 1.0×(1.5 - 1.2) = 2.628 million yuan
2. In traditional machine rooms, due to heat dissipation limitations, the power of each cabinet is ≤8kW. The cold aisle can support 10 - 20kW/cabinet (or even higher), increasing the computing power in the same space by 2 - 3 times.
3.Reducing Equipment Failures and Prolonging Equipment Lifespan
When servers operate under stable temperature and humidity conditions (18 - 24°C, 40% - 60%), the failure rate is reduced by more than 50% (high temperature is the primary cause of server failures).
4.Simplifying Operation and Maintenance, Reducing Labor Costs
The temperature and humidity in the cold aisle are centrally monitored. Any abnormalities (such as the temperature exceeding 24°C) will trigger real - time alarms, eliminating the need for manual inspection of each cabinet.
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