Heating instead of cooling: This ingenious concept from QARNOT is now revolutionizing data centers

Qarnot Computing: The revolution of high-performance computing through sustainability and sovereignty

In a world increasingly driven by data and complex simulations, the demand for computing power has risen exponentially. Industries such as aerospace, automotive, energy, and defense rely on high-performance computing (HPC) to drive innovation, develop products, and understand complex phenomena. But this insatiable hunger for computing power has a downside: traditional data centers have become enormous energy consumers, with cooling accounting for a significant portion of their environmental footprint. It is precisely at this critical juncture that the French company Qarnot is addressing, presenting a radically new vision for the future of cloud computing—a vision that unites performance, cost-efficiency, sustainability, and digital sovereignty in a unique model.

Who is Qarnot? A European pioneer is redefining the cloud

Qarnot is more than just another cloud service provider. The company aims to fundamentally reshape the European HPC landscape. At its core, Qarnot offers an intuitive HPC-as-a-Service (HPCaaS) platform specifically tailored to the needs of engineers and research teams. The fundamental idea is to eliminate the enormous complexity traditionally associated with managing HPC infrastructures. Instead of dealing with server configuration, cluster maintenance, and IT infrastructure management, users can focus entirely on their core work: research, development, and simulation.

Qarnot's mission is to empower engineers in strategically important sectors with the tools they need to innovate faster and more effectively. Whether simulating the aerodynamics of a new aircraft, conducting virtual crash tests for an automobile, analyzing seismic data in the energy sector, or modeling fluid dynamics for ship designs, the Qarnot platform provides seamless access to thousands of state-of-the-art CPU and GPU cores. Users can effortlessly run multiple compute clusters in parallel and dynamically scale their workloads to achieve precise and reproducible results that dramatically shorten the innovation cycle. Accessibility is ensured through a variety of interfaces, including a user-friendly web interface, SDKs for programmatic integration, a powerful API, and a command-line interface (CLI) for advanced users. This enables seamless integration into existing workflows and connectivity with industry-leading simulation software such as Ansys Fluent, Abaqus, and OpenFOAM.

The core of the innovation: sustainability through intelligent heat recovery

What fundamentally differentiates Qarnot from traditional cloud providers and hyperscalers is its proprietary infrastructure and revolutionary heat recovery technology. Conventional data centers are massive, centralized buildings that consume immense amounts of energy—not only to operate the servers themselves, but primarily to cool them. Up to 40 percent of a data center's total energy consumption can be attributed to air conditioning alone, to prevent processors from overheating. This waste heat is typically released unused into the atmosphere, representing a massive waste of energy.

Qarnot reverses this principle. Instead of viewing waste heat as a byproduct, it treats it as a valuable resource. The company has developed a decentralized model where its HPC clusters are not housed in large, isolated data centers, but directly where heat is needed. These locations can be district heating networks, public swimming pools, industrial plants, or even residential buildings. The core of this technology is the “digital boiler,” also known as the QBx. Each of these clusters is equipped with a patented direct water cooling system. Instead of cooling the servers with noisy and energy-intensive fans, water circulates through a closed-loop system of copper pipes that is directly connected to the processors.

Special passive heat exchangers transfer up to 95 percent of the waste heat generated by the servers to the water. This water heats up to temperatures of 65 degrees Celsius and can then be fed directly into the heating system of the respective location. It thus supplies buildings with heating or swimming pools with hot water year-round. Because the system operates in a closed loop, no water is wasted, and no additional energy is required for cooling the servers. This ingenious approach not only drastically reduces Qarnot's operating costs but also lowers the CO2 footprint of the simulations by up to 80 percent compared to conventional data centers. It is a prime example of a circular economy, where a waste product of one process becomes a valuable raw material for another.

Digital sovereignty: A European bulwark in the data world

In an era of increasing geopolitical tensions and data privacy concerns, the concept of digital sovereignty has become crucial for many businesses and governments. Maintaining control over their own data and the underlying IT infrastructure is particularly vital for sensitive sectors such as defense, aerospace, and critical infrastructure. Reliance on non-European cloud providers carries risks ranging from unexpected price hikes and supply chain disruptions to subjection to foreign legislation, such as the US CLOUD Act, which allows US authorities to access data even outside the United States.

Qarnot has based its entire strategy on the principle of complete control over the entire value chain in order to guarantee genuine European sovereignty. This model rests on five pillars:

Complete control of the infrastructure

Unlike many providers that lease computing power from large hyperscalers, Qarnot designs, builds, and operates its own hardware and infrastructure. This gives the company complete control over performance, security, and costs.

Decentralized European locations

All Qarnot servers are operated exclusively at locations within the European Union. This not only ensures compliance with strict European data protection standards such as the GDPR, but also increases reliability through geographical distribution.

Hardware independence through OCP

Qarnot relies on the Open Compute Project (OCP) standard. OCP is an initiative that promotes open and standardized hardware designs for data centers. This avoids vendor lock-in and enables a more flexible, cost-effective, and adaptable infrastructure.

An open-source-based software stack

Most of the software used by Qarnot is based on open-source technologies. Critical components are also developed in-house. This increases transparency, security, and independence from proprietary software licenses.

Strict adherence to European standards

Qarnot is committed to complying with the highest European safety and legal standards, which is crucial for customers in regulated and sensitive industries.

This comprehensive autonomy protects Qarnot and its customers from external shocks and guarantees long-term price stability and operational resilience. It makes Qarnot a strategic partner for all organizations for whom data sovereignty and security of supply are top priorities.

Performance and cost efficiency: When sustainability becomes a competitive advantage

Qarnot's business model impressively demonstrates that environmental sustainability and economic success need not be mutually exclusive. In fact, sustainability is the key to the platform's exceptional cost-efficiency. By eliminating the enormous costs of cooling and monetizing waste heat through its sale to heat partners, Qarnot can offer its HPC services at prices up to 50 percent lower than those of traditional cloud providers. This democratizes access to high-performance computing, making it affordable for small and medium-sized enterprises (SMEs) and research institutions that previously could not afford expensive computing clusters.

At the same time, no compromises are made on performance. The platform offers access to the latest generations of processors and accelerators from leading manufacturers such as AMD and Intel. The decentralized architecture enables high scalability, allowing users to access thousands of cores as needed to run even the most demanding simulations in record time. Eliminating IT overhead leads to further indirect savings. Engineers and scientists can save up to 50 percent of the time they would otherwise spend managing infrastructure. This time saved can be directly invested in productive research and development, further increasing the company's innovation speed and competitiveness.

An intuitive platform, built for engineers

Technological progress is only truly valuable if it is simple and accessible to the people who are meant to use it. Qarnot has adhered to this principle in developing its platform. The user interface and the entire user experience are designed to abstract the complexity of high-performance computing. An engineer does not need to be an expert in system administration to leverage the full power of the Qarnot infrastructure.

The typical workflow is remarkably simple: A user uploads their simulation model, selects the required computing resources via an intuitive interface – such as the number of CPU or GPU cores and the amount of RAM – configures the desired software environment, and starts the computation job with just a few clicks. The platform automatically handles cluster provisioning, task distribution, and resource management in the background. Job progress can be monitored in real time, and the results are available for download once the calculation is complete. This simplicity and high degree of automation significantly lower the barrier to entry for HPC and enable teams of all sizes to utilize state-of-the-art simulation technologies.

The future of computing is green, sovereign, and efficient

Qarnot is at the forefront of a movement redefining the paradigm of data processing. At a time when climate change and digital independence are among the greatest challenges facing our society, the company offers a compelling answer. It demonstrates that unstoppable technological progress doesn't necessarily have to come at the expense of the environment. Instead, technology, when intelligently designed, can be part of the solution.

Qarnot's model is more than just a clever business model; it's a holistic approach that combines technological excellence with environmental responsibility and strategic autonomy. By transforming waste heat from a problem into a resource, it creates a win-win situation for the digital industry and the local community. By relying on a fully European, sovereign infrastructure, it strengthens the continent's technological independence. And by making high-performance computing accessible and affordable, it empowers today's and tomorrow's innovators to solve the complex problems of our time. The future of high-performance computing will not take place in vast, energy-hungry halls, but will be decentralized, integrated, and in harmony with our environment – ​​and Qarnot is leading the way.