Introduction

The rapid development of artificial intelligence (AI), cloud computing, and high-performance computing (HPC) is transforming the 

requirements for modern data center infrastructure.

As AI servers become increasingly powerful, their computing capacity and power density continue to rise. High-performance 

processors generate significantly more heatcompared with traditional IT equipment, creating new challenges for conventional air-cooling systems.

Traditional cooling methods rely heavily on airflow management, cooling fans, and large HVAC systems. However, for next-generation AI data centers, these approaches are 

facing limitations in terms of cooling capacity, energy consumption, and space utilization.

To overcome these challenges, leading data center operators and technology companies worldwide are accelerating the adoption of 

advanced liquid cooling technologies. 

Among these solutions, immersion cooling has emerged as an efficient approach for managing high-density heat loads.

A key component in immersion cooling systems is the immersion plate heat exchanger, which transfers heat from the dielectric 

cooling fluid inside the cooling tank to a secondary cooling circuit.

With its compact structure, high heat transfer efficiency, and flexible design capability, wide channel pillow plate heat exchanger 

technology provides an effective solution 

for advanced liquid cooling applications in modern data centers.

What Challenges Do AI Data Centers Face in Thermal Management?

The increasing demand for AI computing brings several challenges to data center cooling systems.

1. Increasing Server Power Density

AI processors, GPUs, and high-performance computing equipment generate much higher heat loads than traditional servers.

As the power density of individual racks increases, traditional air cooling becomes less effective because air has relatively low heat

 capacity and thermal conductivity.

Liquid cooling provides a more efficient method by directly transferring heat through a cooling medium with much higher thermal 

performance.

2. Higher Energy Efficiency Requirements

Cooling systems represent a significant portion of total data center energy consumption.

Improving cooling efficiency helps operators:

﹡Reduce operating costs;

﹡Lower Power Usage Effectiveness (PUE);

﹡Improve overall sustainability.

Immersion cooling reduces the dependence on air-conditioning systems and high-power ventilation equipment, creating opportunities

 for more energy-efficient data center operation.

3. Limited Space Availability

Modern data centers require higher computing capacity within limited physical space.

Compact cooling solutions are essential because they allow higher heat removal capability without significantly increasing the 

footprint of cooling infrastructure.

4. Reliability and Continuous Operation

Data centers require extremely reliable thermal management systems.

Cooling equipment must provide:

﹡Stable heat transfer performance;

﹡Long operating life;

﹡Low maintenance requirements;

﹡Resistance to changing operating conditions.

What Is an Immersion Plate Heat Exchanger?

An immersion plate heat exchanger is a fully welded heat transfer device designed to operate directly inside a cooling tank or liquid

 environment.

In an immersion cooling system, electronic components are submerged in dielectric cooling fluid. Heat generated by servers is

 absorbed by the cooling liquid and 

transferred through the immersion plate heat exchanger to a secondary cooling loop.

Unlike conventional shell-and-tube heat exchangers, immersion plates provide a large heat transfer surface within a compact 

structure.

The basic principle is:

Heat-generating equipment → Dielectric cooling fluid → Immersion plate heat exchanger → Secondary cooling system

This indirect heat transfer method enables efficient thermal management while maintaining system reliability.

Why Are Wide Channel Pillow Plate Heat Exchangers Suitable for Immersion Cooling?

Wide channel pillow plate heat exchangers combine the advantages of compact design, efficient heat transfer, and operational 

reliability.

1. Compact Structure with High Heat Transfer Density

The pillow plate design creates controlled turbulence inside the flow channels, improving heat transfer performance.

Compared with traditional heat exchangers, pillow plate technology offers:

Large heat transfer area within a compact volume;

Flexible plate dimensions;

Lightweight construction;

Easy integration into cooling systems.

For data centers where installation space is valuable, compact heat exchanger designs provide significant advantages.

2. Excellent Compatibility with Different Cooling Media

Immersion cooling systems may utilize different cooling fluids depending on temperature requirements, system design, and 

environmental considerations.

Immersion plates can be designed for use with various cooling mediums, including:

R717 (Ammonia);

CO₂;

Propylene Glycol;

Ethylene Glycol;

R22;

R134a;

R404A.

This flexibility allows engineers to select appropriate cooling solutions for different applications.

3. Suitable for Variable Flow Conditions

Data center cooling systems may experience changing heat loads depending on computing demand.

Wide channel pillow plate heat exchangers can accommodate highly variable volume flows while maintaining reliable heat transfer 

performance.

This makes them suitable for dynamic operating conditions commonly found in AI computing environments.

4. Lower Fouling Risk and Easier Maintenance

One challenge in heat exchanger applications is fouling caused by impurities, deposits, or fluid characteristics.

Compared with narrow-channel heat exchangers, wide channel designs provide larger flow passages, reducing:

Flow resistance;

Blockage risk;

Pressure drop.

The larger channel spacing also improves accessibility for cleaning and maintenance.

This advantage is particularly valuable for industrial cooling applications where long-term reliability is critical.

What Are the Advantages of Pillow Plate Technology Compared with Traditional Heat 

Exchangers?

Fully Welded Construction

Pillow plate heat exchangers use a fully welded structure without gaskets.

Advantages include:

﹡Reduced leakage risk;

﹡Better durability;

﹡Suitability for demanding operating conditions.

Flexible Material Selection

Depending on the cooling medium and operating environment, pillow plates can be manufactured using different material,including:

﹡Stainless Steel 304;

﹡Stainless Steel 316L;

﹡Duplex Stainless Steel 2205;

﹡Titanium;

﹡Other corrosion-resistant alloys.

Material selection can be optimized according to corrosion resistance, temperature, and pressure requirements.

Customized Design Capability

Every cooling system has different requirements.

Pillow plate heat exchangers can be customized according to:

﹡Heat duty;

﹡Fluid properties;

﹡Flow rate;

﹡Pressure drop requirements;

﹡Installation space.

This flexibility allows engineers to develop optimized solutions for specific applications.

Typical Design Considerations for Immersion Plate Heat Exchangers

Parameter                                                     Consideration

Cooling Media                                              R717, CO₂, Glycol, Refrigerants

Heat Exchanger Type                                Fully Welded Pillow Plate

Flow Channel                                              Wide Channel Design

Materials                                                     SS304, SS316L, Duplex 2205, Titanium

Applications                                                      Immersion Cooling, Process Cooling, Industrial Thermal Management

Design Focus                                                High Efficiency, Low Pressure Drop, Long Service Life

Beyond Data Center Cooling: Other Applications of Immersion Plate Technology

Although immersion cooling is receiving increasing attention due to AI computing development, wide channel pillow plate heat 

exchangers are also suitable for many industrial applications.

Typical applications include:

﹡Industrial refrigeration;

﹡Chemical processing;

﹡Food and beverage production;

﹡Crystallization systems;

﹡Waste heat recovery;

﹡Process cooling systems.

The same characteristics that benefit data center cooling — compact structure, reliable operation, and flexible design — also provide

 advantages in challenging industrial environments.

Conclusion

The rapid growth of AI and high-performance computing is driving the evolution of data center cooling technologies.

Immersion cooling provides an efficient approach for managing increasing heat loads, while the performance of the heat exchanger

 plays a critical role in system reliability

 and energy efficiency.

Wide channel pillow plate heat exchangers provide a combination of:

﹡High heat transfer efficiency;

﹡Compact installation;

﹡Flexible cooling media compatibility;

﹡Low fouling risk;

﹡Easy maintenance;

﹡Long service life.

By integrating advanced pillow plate technology with immersion cooling systems, next-generation data centers can achieve more 

efficient and reliable

 thermal management.

ZZ Thermal specializes in the design and manufacturing of wide channel pillow plate heat exchangers for advanced cooling systems

, process applications, and industrial heat transfer solutions.