✅ Server Heat Problems and the Need for Liquid-Cooled Servers

As enterprise digital transformation and AI adoption accelerate, server infrastructure is being asked to deliver higher performance and stability than ever before.

As high-load computing such as AI training, financial risk calculations, big data analytics, and simulations becomes routine, the latest CPUs and GPUs boast more cores and higher clock speeds than previous generations. However, this high performance also means more heat. Heat is not just an inconvenience; it directly limits server performance. When temperatures reach critical thresholds, CPUs and GPUs automatically lower their clock speeds through throttling to prevent overheating. In the process, expected performance drops significantly. In addition, server heat management is not simply a matter of maintaining performance; it is directly tied to operating costs and data center design. Strengthening cooling equipment to deal with excessive heat increases power costs and limits how far rack density can be raised.

Ultimately, maximizing the potential of high-performance servers requires new cooling technology that can fundamentally solve the heat problem.

✅ Structural Limitations of Air-Cooled Servers

The traditional solution for server cooling is air cooling. Using fans to circulate air and dissipate heat from components to the outside is a simple, proven solution that has been used for a long time. However, air's low thermal conductivity has become a clear limitation in high-performance computing environments.

• · Low cooling efficiency: Air has significantly lower thermal conductivity than liquid, so it cannot effectively absorb and transfer heat.
• · More fans: As the number of high-performance components increases, more fans are needed, which increases noise and power consumption.
• · Reduced rack space efficiency: Fan and heatsink designs become more complex, making servers larger and lowering rack density.
• · Higher data center costs: The air conditioning of the entire data center must be strengthened to cool servers, significantly increasing power costs.

As a result, air-cooled servers struggle to effectively manage the heat of the latest high-performance CPUs and GPUs and lead to inefficient use of server room space and power costs.

✅ The Concept and Advantages of Liquid-Cooled Servers

Liquid cooling is the technology drawing attention as a way to overcome these limitations. Liquids have roughly 20 to 30 times or more the thermal conductivity of air, allowing them to absorb and transfer heat far more effectively.

How liquid-cooled servers work:

• · Coolant absorbs heat by directly contacting high-heat components (e.g., CPUs, GPUs) or through heat plates
• · The absorbed heat is released to the outside through a closed loop or radiator
• · The coolant is recirculated to maintain continuous cooling

Key advantages:

• · Maximized heat management: Stable temperature control of high-heat components → prevents throttling
• · Overclocking support: Enables sustained high-clock operation
• · Improved power efficiency: Fewer fans reduce power consumption and operating costs
• · Reduced noise: Fewer fans or lower fan speeds reduce server room noise
• · Higher rack density: High-performance computing resources can be placed efficiently in a smaller space

Liquid-cooled servers are not just a change in cooling method; they are a key technology that can dramatically improve data center design, operating costs, and service quality.

✅ Closed Liquid Cooling System

There are various designs of liquid cooling. Open-loop systems are directly connected to the outside and require coolant replacement or replenishment due to evaporation, which carries risks of leakage and contamination. The approach used to solve these problems is the Closed Liquid Cooling System.

Features and strengths

• · Closed-loop design: Coolant circulates inside the system without contact with the outside → minimizes the risk of leakage and evaporation
• · Enhanced stability: Leak-prevention structures and safety valves are adopted at the design stage
• · Consistent cooling efficiency: Maintains consistent cooling performance unaffected by changes in the external environment
• · Simplified maintenance: Longer coolant replenishment intervals and simpler management
• · Data center optimization: Standard 2U rack-type design allows easy integration into existing infrastructure

Closed systems are particularly advantageous in data center environments that require high-density rack configurations and long periods of continuous operation, and they help reduce total cost of ownership (TCO).

✅ CloudNetworks' Answer: CN-LCS Series

After carefully considering the need for and limitations of these cooling technologies, CloudNetworks developed the "CN-LCS Series."

The CN-LCS Series is a 2U rack-type server that applies a Closed Liquid Cooling System, based on a liquid cooling method designed in-house by CloudNetworks. This enables stable overclocking even in high-heat environments and significantly improves the power efficiency and ease of management of server operations.

■ Key Features of the CN-LCS Series

• · 2U rack-type design: Optimized for standard data center infrastructure
• · Closed liquid cooling system: Stable and efficient heat management
• · Sustained overclocking support: Delivers the maximum performance of CPUs and GPUs
• · Reduced power costs: Minimizes fan power consumption
• · Low-noise operation: A more comfortable server room environment
• · Simple maintenance: Long coolant replacement intervals and lower management costs

■ Air-Cooled Servers vs CN-LCS Series 

■ Use Cases and Applicability​

The CN-LCS Series has proven its stability and efficiency in the financial sector and is used reliably even for high-load transaction processing. Building on these strengths, it can be used effectively across a variety of industries and environments.

• · AI/Machine learning: GPU-based large-scale model training and high-heat cluster environments
• · Manufacturing and engineering: Simulation and CAE analysis servers
• · Research institutions and universities: Building HPC (high-performance computing) clusters
• · Cloud service companies: High-density rack configurations and data center power optimization

The CN-LCS Series provides integrated support for design, manufacturing, installation, and maintenance tailored to customer requirements.

✅ Conclusion

Heat management is not just a technical challenge; it is a key factor that determines an enterprise's competitiveness, service quality, and operating costs.

CloudNetworks' CN-LCS Series is a practical and innovative liquid-cooled server solution that can solve these problems. Take the cooling efficiency of your server environment to a new level with the CN-LCS Series, which combines a stable high-performance environment, power efficiency, and ease of maintenance.