Five Innovative Data Center Cooling Systems

As the demand for data processing continues to surge, so does the need for effective cooling solutions. Traditional cooling methods are not only energy intensive, but also difficult to keep up with the heat generated by modern computing equipment. In response, a wave of innovative data center cooling systems has emerged, reshaping the landscape of data center management.

Liquid cooling is a revolutionary innovation that significantly changes the way data centers are cooled and is one of the most popular cooling technologies available today. There are many different types of liquid cooling systems, and each new innovation offers greater efficiency.

Direct chip cooling is a more novel liquid cooling technology. Unlike traditional air cooling methods, which indirectly cool data center equipment by cooling the surrounding air, the cooling liquid (usually dielectric or non-conductive) is integrated into the server hardware via a network of small pipes or microchannels, allowing the coolant to be delivered directly to hot spots in the various components of the server, including the central processing unit (CPU) and other chips. This technique is commonly used in high-performance computing environments, such as supercomputers and data centers that host power-hungry applications that generate a lot of heat.

Two-phase immersion cooling is an innovative and efficient way to cool high-performance computing systems, including servers and data center equipment. Unlike traditional air or liquid cooling methods, two-phase immersion cooling completely submerges hardware components in a specially designed dielectric or non-conductive cooling liquid. This coolant is usually a synthetic coolant in two phases: liquid and steam. With a boiling point of 50°C, it is a better heat conductor than air, water or oil. The vapor formed by the interaction between the liquid and the heating component passively promotes heat transfer.

Two phase immersion cooling has several advantages. The first is greater efficiency and energy savings. Compared to air cooling, this cooling technology has a > 90% efficiency advantage. In addition, since the components are not affected by temperature changes, the technology also improves reliability. At the same time, it also allows high density hardware deployment, as it eliminates the need for air circulation and large cooling infrastructure.

Geothermal cooling has been around for quite some time, but not many data centers have been able to take advantage of its low cost and environmental benefits. It is a relatively stable and cool temperature below the Earth's surface, that is, geothermal energy or ground source heat acts as a radiator, rather than releasing air outdoors as traditional air conditioners do. A network of pipes buried underground (called surface loops) contains a heat exchange fluid, usually a mixture of water and antifreeze. The system passes through vertical underground Wells filled with heat transfer fillers. The heat exchange fluid in the pipe absorbs heat from inside the building, including data center equipment, during cooling. As the fluid circulates through the surface loop, it exchanges heat with the cooler underground environment.

Geothermal cooling is considered a green and sustainable cooling solution as it significantly reduces greenhouse gas emissions and dependence on fossil fuels.

Microchannel liquid cooling is an extension of direct chip liquid cooling with the addition of cold plates directly targeting the CPU, GPU, and memory modules to effectively dissipate the heat generated by electronic components. This cooling method utilizes small, complex channels or microchannels to deliver the liquid coolant close to the heat source, thereby enhancing heat dissipation and thermal performance.

Microchannel heat exchangers are typically made of materials such as copper or aluminum and consist of many small channels, usually in the micron range in size. These channels are designed to be highly compact and heat transfer efficient, reducing size by 10 to 30 percent and weight by 60 percent, greatly reducing the data center footprint. This cooling method also reduces costs, as there are fewer refrigerant and material costs.

Microconvection liquid cooling uses a large number of tiny, precisely designed fluid jets in a compact cooling module, which changes chip-level cooling performance. The technology was created to improve the performance of applications with the most compute-intensive profiles. Since microconvection cooling facilitates vertical flow to the device, increasing the heat transfer coefficient of heat dissipation, the use of thermal interface materials is eliminated.

Microconvection liquid cooling is particularly valuable in situations where traditional cooling methods may not provide sufficient cooling capacity or where the size and weight of the cooling solution must be minimized. This is an area of ongoing research and development of thermal management techniques.

Innovative data center cooling systems are changing the way we manage and maintain the massive computing infrastructure that powers the digital world. Adopting these advanced technologies will not only improve the performance and longevity of data center equipment, but also contribute to a greener, more sustainable digital future.