Comparing Supercritical CO₂ Rankine Receivers to Conventional Water Cooling in Data Centers

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Comparing Supercritical CO₂ Rankine Receivers to Conventional Water Cooling in Data Centers

Introduction

Data centers traditionally rely on water-based cooling loops to remove heat from processors, GPUs, and dense server racks. As workloads from artificial intelligence and high-performance computing grow, these conventional systems are strained by rising heat fluxes and higher coolant return temperatures. Supercritical carbon dioxide in an Organic Rankine Cycle configuration introduces a new approach. By capturing waste heat at moderate temperatures, CO₂ can be expanded to recover energy while also functioning as a highly efficient cooling medium. This article compares CO₂-based receiver tanks with conventional water loops to assess their suitability for future data center cooling.

Conventional Water-Based Cooling

Water has long been the standard medium for liquid cooling due to its high heat capacity and availability. A typical water loop consists of pumps, piping, cold plates or immersion modules, and a large expansion tank. The expansion tank compensates for changes in volume caused by temperature fluctuations and ensures the pump has a steady supply.

Advantages:

Simple design, non-toxic, and abundant.

High specific heat provides good thermal buffering.

Limitations:

Requires large expansion tanks compared to CO₂ receivers.

Inefficient at low-grade heat recovery; heat is usually rejected, not reused.

Water purity and corrosion inhibitors must be carefully managed.

Supercritical CO₂ in a Rankine Loop

In a CO₂ Rankine cycle, liquid CO₂ is pumped, heated to supercritical conditions, expanded, and then condensed back to liquid. A receiver tank is installed at the condenser outlet. Its role is similar to the expansion tank in a water loop, but because of CO₂’s density and compressibility, the required volume is much smaller.

For a two liter experimental loop:

At 45 C turbine inlet temperature, the receiver size is about two liters.

At 100 C turbine inlet temperature, the receiver size is about one liter.

In practical designs, a one to two liter receiver provides ample margin for stability, charge balancing, and startup. This compact footprint is a stark contrast to the much larger expansion tanks required in water-based systems of equivalent capacity.

Key Differences

Receiver Size: A supercritical CO₂ receiver can be less than half the size of a water expansion tank for a similar duty loop, saving footprint in rack-level cooling modules.

Heat Recovery: Unlike water systems that primarily reject heat, a CO₂ Rankine loop can convert part of the waste heat into usable power. This dual function adds value for energy-intensive data centers.

Temperature Flexibility: Water loops typically operate below 60 C to avoid material stress and efficiency losses. Supercritical CO₂ loops can operate effectively at 45 C and 100 C inlet temperatures, aligning well with waste heat levels from GPUs and AI racks.

Scalability: Smaller receiver tanks and compact CO₂ circuits make it easier to scale cooling skids to match rack density without large infrastructure changes.

Conclusion

Conventional water loops remain a reliable and simple choice for data centers, but their expansion tanks are bulky and their cooling potential is limited to heat rejection. Supercritical CO₂ Rankine receivers, by contrast, offer compact size, higher flexibility, and the potential for power recovery. For data centers under pressure to reduce footprint and increase efficiency, supercritical CO₂ loops with well-sized receivers present a strong alternative to water-based cooling.