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Liquid-cooled heat exchanger

Fiber and communications infrastructure knowledge brief Published 28 Apr 2021

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

A liquid-cooled heat exchanger transfers heat between two liquid streams without mixing them, optimizing thermal management in industrial and high-performance applications.

Overview

A liquid-cooled heat exchanger is a device designed to efficiently transfer thermal energy from a hot liquid to a cooler liquid while keeping the fluids separate, preventing contamination and maintaining process integrity. These systems are essential in industries such as chemical processing, pharmaceuticals, food production, petrochemicals, energy, and high-performance computing.

Mechanism and Design

Liquid heat exchangers operate by absorbing heat from the hot liquid, conducting it through a solid medium, and rejecting it into the cooler liquid. Common design features include: Counterflow configuration, where hot and cold liquids flow in opposite directions to maximize heat transfer efficiency. Brazed plate structures, which allow compact, high-efficiency heat exchange with materials like copper, stainless steel, or nickel for corrosion resistance.

Tube-fin or flat-tube designs, which increase surface area and enhance thermal performance without enlarging the system footprint.

Types of Liquid-

Cooled Heat Exchangers

Plate Heat Exchangers – Compact, efficient, and suitable for low to medium pressures; ideal for water, glycol, or light solvents.

Shell-and-

Tube Heat Exchangers – Robust, suitable for high-pressure or high-viscosity fluids; widely used in chemical and energy industries. Spiral Heat Exchangers – Provide uniform flow and are resistant to fouling, suitable for viscous or particle-laden fluids. Brazed Plate Heat Exchangers – High thermal efficiency, compact, and often used in electronics cooling or precision applications.

Additive Manufactured Heat Exchangers – Customizable, lightweight, and optimized for complex fluid paths, improving heat transfer and reducing pressure loss.

Applications

Industrial Processes: Temperature control in chemical reactions, oil cooling, and process fluid heating.

Data Centers and A

I Systems: Direct-to-chip cooling for GPUs and AI accelerators, using modular liquid-to-air or liquid-to-liquid heat exchanger units to maintain safe operating temperatures. Hydraulic and Fuel Systems: Oil-to-water or fuel-to-coolant heat transfer for lubrication and temperature stabilization.

Design Considerations

Fluid Properties: Viscosity, fouling tendency, and chemical compatibility determine the choice of heat exchanger type. Pressure and Flow Rates: High-pressure applications may require shell-and-tube or tubular designs, while low-pressure systems can use gasketed plate exchangers. Thermal Efficiency: Optimized through counterflow arrangements, increased surface area, and precise flow path design.

Maintenance and Cleaning: Designs with wide free passages or modular components facilitate cleaning and reduce downtime.

Advantages

Efficient heat transfer in compact spaces. Precise temperature control for sensitive processes. Flexibility to handle corrosive, viscous, or reactive liquids.

Reduced energy consumption and improved system reliability. Liquid-cooled heat exchangers are critical for modern thermal management, offering high efficiency, durability, and adaptability across diverse industrial and technological applications.

Liquid-cooled heat exchanger - ENSAA OPTICAL NETWORKS [PDF]

Liquid-cooled heat exchanger

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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