How Rotodynamic Technology Could Cut Global Industrial Emissions by 2.4 Gigatons Every Year
Coolbrook's RotoDynamic Heater and Reactor technologies are rewriting the rules of industrial heat — turning electricity into 1,700 °C flames without a single molecule of fossil fuel burned. The stakes: nearly a third of all industrial CO₂ on Earth.
.webp "How Rotodynamic Technology Could Cut Global Emissions at Scale")
The world has a heat problem. Not too much of it — the kind that melts glaciers — but too little ability to make it cleanly. Industrial processes that forge steel, bake cement, and crack oil into plastics need temperatures that no solar panel or wind turbine can conjure directly. For over a century, that meant combustion. Now, a Finnish deep-tech company called Coolbrook is proposing something genuinely radical: spin a rotor fast enough, and the physics of shock waves will do what fire used to do — without burning anything at all.
The Decarbonization Problem Nobody Wants to Talk About
When climate conversations turn to solutions, the usual parade arrives: solar, wind, electric vehicles, heat pumps. These are real and vital. But they all share a quiet limitation — they work brilliantly for low-to-medium temperatures and transportation. They falter badly when confronted with the furnaces, kilns, and crackers that make the physical fabric of modern civilization.
.webp)
Consider the scale: heavy industry — primarily chemicals and petrochemicals, iron and steel, and cement — collectively consumes more than half of all global industrial energy and produces roughly two-thirds of industrial CO₂ emissions. These three sectors alone emit somewhere between eight and nine billion tons of carbon dioxide every single year. That is more than the entire transport sector. It is more than the combined output of every car, truck, ship, and aeroplane on Earth.
The reason these sectors remain stubbornly fossil-dependent comes down to physics and engineering realities that most clean-energy narratives quietly sidestep:
- Heat pumps are exceptional tools for space heating and moderate industrial applications, but scaling them to 1,000 °C+ requires multi-stage cascaded systems of brutal complexity and dubious economics.
- Electric resistance heating works in theory but confronts severe material degradation at extreme temperatures — elements fail, maintenance costs explode, and the economics rarely stack up for high-throughput industrial loads.
- Green hydrogen carries the burden of a round-trip efficiency penalty: energy is lost during electrolysis, more during compression and transport, and yet more during combustion. The net result is significant energy waste at each step.
- Carbon capture and storage (CCS) is capital-intensive, operationally complex, and extremely difficult to retrofit onto existing plant configurations without significant redesign.
- Biomass is a finite resource with competing demands from food systems, biodiversity, and land use; its global supply is wholly inadequate for the sheer scale of industrial heat demand.
The industry has known this impasse for decades. What it has not had is a clean, scalable, physics-based path out of it. That is precisely what rotodynamic electrification is attempting to provide.
"Decarbonising high-temperature industrial heat is arguably the hardest unsolved problem in the entire energy transition. It is not a funding gap or a political gap — it is an engineering gap." — Industry consensus reflected across IEA, McKinsey Global Energy Perspective, and BloombergNEF industrial transition reports
Technology Origins: 19th-Century Physics, 21st-Century Application
The intellectual lineage of rotodynamic heating stretches back to 1884, when the British engineer Sir Charles Parsons unveiled the world's first practical steam turbine. Parsons established the foundational thermodynamic relationships between pressure, velocity, and temperature that would eventually power the British naval fleet, electrify entire nations, and later propel jet aircraft to the stratosphere. The mathematics he codified — the behavior of gas under rapid compression, the conditions under which shock waves form and collapse — would take nearly a century and a half to be repurposed in this particular way.
Turbomachinery, as it evolved through the 20th century, was predominantly focused on one challenge: extracting work from hot, pressurized gas as efficiently as possible while minimizing unwanted heat generation. The goal was always to keep gas cool during compression, extract maximum thrust or shaft power, and treat thermal energy as the enemy of efficiency. Aviation engineers, in particular, became extraordinarily good at exactly this discipline.
Coolbrook's insight — and it is a genuinely elegant inversion — was to ask what happens when you apply the same turbomachinery physics not to extract work from gas, but to deliberately and controllably inject energy into it. Instead of fighting the heat that compression and shock physics produce, you embrace it. You engineer for it. You make it the entire point.
How the Rotodynamic Reactor Generates Heat Without Fire
.webp "Coolbrook Roto Dynamic Reactor")
At its mechanical core, the RotoDynamic Reactor (RDR) is a high-speed electric turbomachine. But describing it that way understates how counterintuitive its operating principle actually is. There is no burner. There is no combustion chamber. There is no flame. There is only a rotor, spinning at extraordinary speeds, and the physics of supersonic gas dynamics doing the rest.
The process unfolds in four distinct stages that together transform electrical energy into extreme heat within milliseconds:
- Gas Preheating — A working gas — this can be air, steam, nitrogen, CO₂, or a hydrocarbon feedstock, depending on the application — enters the reactor and undergoes an initial preheating stage to prepare it for the energy transfer that follows.
- Supersonic Acceleration — The preheated gas is fed into the path of a rotor spinning at extreme rotational velocities. The interaction between the gas and the rotor blades accelerates the gas flow to supersonic speeds — velocities exceeding the speed of sound within the gas medium.
- Shock Formation — The supersonic gas stream encounters a carefully engineered diffuser section. In this zone, the geometry of the flow path forces the gas to decelerate, and the conditions for shock wave formation are met. Multiple shock waves develop and propagate through the gas stream.
- Energy Conversion — When these shock waves collapse — a process that occurs in fractions of a millisecond — the kinetic energy carried by the supersonic gas is converted almost entirely into thermal energy. The gas temperature spikes rapidly and dramatically, reaching values that approach 1,700 °C in the most aggressive configurations.
What makes this genuinely impressive from an engineering standpoint is the toroidal geometry of the reactor chamber. By designing the flow path as a closed torus rather than a linear duct, the gas can be made to circulate through multiple rotor-stator stages in successive passes. Each pass adds more energy, increasing the thermal output without needing to scale the physical dimensions of the machine proportionally. The result is an extraordinarily high energy density in a compact form factor — a critical advantage when retrofitting into existing industrial plants where space is often severely constrained.
The electrical-to-heat efficiency of this process reaches approximately 90–95%. To put that in context: a green hydrogen pathway — electrolysis, compression, storage, transport, combustion — might deliver somewhere between 25% and 40% of the original electrical energy as useful process heat. The rotodynamic pathway, by bypassing all those intermediary steps, retains nearly all of the input energy as direct, usable heat.
RDH vs. RDR: Same Physics, Different Missions
Coolbrook has developed two distinct product platforms — the RotoDynamic Heater (RDH) and the RotoDynamic Reactor (RDR) — that share the same underlying thermodynamic operating principle but are engineered for fundamentally different industrial use cases. Understanding the distinction between them is essential to grasping the full scope of the technology's potential.
| Attribute | RotoDynamic Heater (RDH) | RotoDynamic Reactor (RDR) |
|---|---|---|
| Primary Function | Electrifies industrial process heating | Replaces combustion-based chemical reactors |
| Working Gases | Air, nitrogen, steam, CO₂ | Hydrocarbon feedstocks (e.g. naphtha, ethane) |
| Typical Application | Furnaces, kilns, hot stoves | Steam cracking, pyrolysis |
| Max Scalability | Above 50 MW per unit | Scalable to full cracker capacity |
| Retrofit Compatible | Yes — designed for existing plants | Yes — replaces existing reactor trains |
| Temperature Range | Up to ~1,700 °C | Up to ~1,700 °C |
| Coking / Maintenance | Not applicable | Significantly reduced vs. combustion |
| Product Yield Impact | Neutral to slightly positive | Up to ~10% increase in valuable output |
| Key Pilot Location | Multiple industrial partners (TBD) | Brightlands Chemelot Campus, Netherlands |
The RDH is positioned primarily as a direct-combustion replacement in processes where the working fluid does not participate in a chemical reaction — it simply needs to be heated to a target temperature. In cement kilns, steel reheating furnaces, and aluminium smelters, the RDH essentially performs the same mechanical role as a gas burner, but drawing from the electrical grid instead of a gas pipeline.
The RDR goes a step further. In petrochemical steam cracking, the feedstock gas itself passes through the rotodynamic system. Because the heating occurs within milliseconds rather than over the seconds-long residence time of a conventional cracker tube, the temperature profile can be controlled with a precision that combustion-based furnaces simply cannot achieve. This precision translates directly into improved selectivity — more of the desired products (ethylene, propylene) are formed, and less of the unwanted heavy byproducts. The reduction in coking — the carbon deposits that accumulate inside cracker tubes and require costly periodic shutdowns for removal — is an additional operational benefit with significant maintenance cost implications.
Cement: The Billion-Ton Opportunity
.webp "Role of RotoDynamic Heater and Reactor In Heavy Industries")
Cement is, in the most literal sense, the material that built the modern world. It is the most widely used manufactured material on Earth — roughly four billion tonnes of it are produced every year. It is also one of the most carbon-intensive. The cement sector alone accounts for approximately one-third of all industrial CO₂ emissions, making it responsible for around 7–8% of total global greenhouse gas output. If the cement industry were a country, it would be the third-largest emitter on the planet.
The chemistry is, in part, unavoidable: the calcination of limestone releases CO₂ as a fundamental byproduct of the chemical reaction that produces clinker, the binding agent in cement. But a substantial portion of the industry's emissions come not from chemistry but from the fossil fuels burned to reach the 1,450 °C temperatures that calcination requires. This is the portion that rotodynamic electrification directly addresses.
Eliminating the combustion-derived emissions from cement production alone could remove approximately one billion tons of CO₂ from the global atmosphere each year. The specific applications within cement manufacturing where the RDH is most immediately relevant include:
- Clay calcination — processing alternative supplementary cementitious materials as clinker substitutes, significantly reducing the total clinker required per tonne of cement produced
- Kiln precalciner electrification — replacing the fossil-fuel burners in precalciner vessels, where roughly 60% of the thermal energy in a modern cement plant is consumed
- White cement production — enabling higher-capacity, electrically heated white cement kilns where colour purity requirements already exclude certain fuels
- Combustion air preheating — increasing the temperature of combustion air to improve overall kiln thermal efficiency during any transitional period of partial electrification
Petrochemicals: Cracking the Carbon Problem
.webp "Role of RotoDynamic Heater and Reactor In Heavy Industries")
The global petrochemical industry generates approximately 1.5 billion tons of CO₂ per year. At the heart of this footprint sits a single process: steam cracking — the high-temperature thermal decomposition of hydrocarbon feedstocks (naphtha, ethane, propane) into the building-block olefins — ethylene, propylene, and butadiene — that are the raw materials for plastics, synthetic rubber, solvents, and thousands of other products.
Steam cracking furnaces are among the most energy-intensive pieces of equipment in all of manufacturing. They operate continuously, at temperatures between 750 °C and 900 °C in the reaction zone, powered almost exclusively by natural gas combustion. They are also, by design, brutally difficult to decarbonize — partly because of the temperatures involved and partly because of the extraordinary capital cost of a world-scale ethylene cracker, which can run to several billion dollars and is expected to operate for thirty or more years.
The RotoDynamic Reactor directly replaces the fired cracking furnace. Rather than heating the feedstock by convection from combustion gases in a tubular furnace, the RDR achieves the requisite temperature through the shock wave physics described above. The consequences are significant on multiple dimensions:
- Emissions elimination: Removing fossil-fuel combustion from steam cracking operations eliminates hundreds of millions of tonnes of CO₂ annually from the global petrochemical sector.
- Yield improvement: The millisecond heating profile achievable with the RDR allows more precise control over the cracking reaction, improving selectivity for ethylene and propylene by up to approximately 10% compared with conventional furnaces — a commercially significant advantage that helps underwrite the capital cost of transition.
- Reduced coking: Because the heating is so rapid and the residence time is shorter, carbon deposition inside the reactor is significantly reduced, cutting both maintenance downtime and operating costs.
- Recycled plastics compatibility: The precise temperature control and rapid heating of the RDR make it considerably more suitable for processing chemically recycled plastic feedstocks — a critical pathway for closing the plastics loop in a circular economy framework.
The technology has already advanced beyond the laboratory. A pilot facility demonstrating the RotoDynamic Reactor in a steam cracking context has been commissioned at the Brightlands Chemelot Campus in the Netherlands, adjacent to the Chemelot chemical industrial complex — one of Europe's largest integrated chemical production sites.
Iron & Steel: Where Gigatons Are Won or Lost
.webp "Role of RotoDynamic Heater and Reactor In Heavy Industries")
Steel is the skeleton of the industrial economy — the material from which bridges, buildings, ships, cars, pipelines, and turbines are made. The world produces roughly 1.9 billion tonnes of it every year, and doing so releases somewhere between 7% and 9% of all global greenhouse gas emissions. Few sectors carry a heavier climate burden.
The steel industry's emission profile is complex because the production process involves multiple high-temperature stages, each of which currently relies on fossil fuels in different ways. The RotoDynamic Heater can be deployed across virtually all of them:
- Blast furnace hot stoves — heating the air blast to above 1,200 °C before it enters the blast furnace tuyeres; currently done by burning blast furnace gas, these could be electrified with the RDH
- Scrap preheating — heating scrap metal before it enters electric arc furnaces (EAFs) to reduce electrical energy consumption in the furnace itself
- Direct reduced iron (DRI) processing — supporting shaft furnace operations where high-temperature reducing gases are required
- Hydrogen-based steelmaking — providing the high-temperature process heat needed for green hydrogen direct reduction routes, complementing rather than competing with hydrogen pathways
- Reheating furnaces — heating slabs, blooms, and billets to rolling temperatures before forming operations
The cumulative potential across all these applications is startling. If rotodynamic electrification were deployed at scale across the global steel industry, annual CO₂ reductions could exceed one billion tonnes — making steel decarbonization alone equivalent in scale to eliminating the entire aviation sector's emissions several times over.
| Industry Sector | Annual CO₂ Emissions (Gt) | Share of Industrial Total | RDH/RDR Reduction Potential (Gt/yr) | Status (2025) |
|---|---|---|---|---|
| Cement & Lime | ~3.0 | ~35% | ~1.0 | Pre-commercial pilots |
| Iron & Steel | ~2.6 | ~28% | >1.0 | Technology development |
| Chemicals & Petrochemicals | ~1.5 | ~18% | ~0.3–0.5 | Pilot at Chemelot (NL) |
| Aluminium | ~0.5–0.7 | ~7% | ~0.1–0.2 | Near-term roadmap defined |
| Other Hard-to-Abate | ~1.5 | ~17% | ~0.1+ | Exploratory |
| Total | ~9.0 | 100% | ~2.4+ | — |
Aluminium: A Phased Electrification Roadmap
.webp "Role of RotoDynamic Heater and Reactor In Heavy Industries")
Aluminium manufacturing accounts for roughly 2% of total global greenhouse gas emissions — a number that, in absolute terms, still represents over 500 million tonnes of CO₂ equivalent per year. The production chain is energy-intensive at multiple points: the Bayer process for refining alumina from bauxite requires substantial heat for calcination and digestion, while smelting by electrolysis is already an electrical process but one that benefits from high-quality thermal management throughout the facility.
Coolbrook has laid out a phased electrification roadmap for the aluminium sector that acknowledges the different investment cycles and technical readiness levels across different parts of the production chain:
The Full Climate Impact Picture
.webp "Climate Impact Potential")
Stepping back from individual sectors to view the aggregate potential, the numbers are striking in their scale. Heavy industry as a whole emits somewhere between 8 and 9 billion tonnes of CO₂ per year. Coolbrook's technologies, if deployed comprehensively across their addressable market, could eliminate approximately 2.4 billion tonnes of that annually.
To calibrate that figure against other frequently cited climate benchmarks: the entire global commercial aviation sector — every passenger flight and cargo aircraft that operates anywhere in the world — produces approximately 800 million tonnes of CO₂ per year. The 2.4-gigaton target of rotodynamic electrification is therefore equivalent to eliminating the aviation sector's entire climate footprint three times over, simultaneously. Companies such as Rolls-Royce, working to decarbonize aero-engines, are targeting emissions that are an order of magnitude smaller than the industrial heat problem.
Expressed differently: achieving the 2.4-gigaton reduction potential of rotodynamic electrification would represent roughly 7% of total global CO₂ emissions in a single technology intervention. In a world where every fraction of a degree of warming matters, single-technology interventions of this magnitude are extraordinarily rare.
The 2.4-gigaton annual reduction potential of fully deployed rotodynamic technology would be equivalent to eliminating the combined emissions of Germany and France — every single year, indefinitely.
Engineering Realities and Grid Challenges
No honest assessment of this technology can avoid the real engineering and infrastructure barriers that stand between a promising pilot facility in the Netherlands and a global fleet of rotodynamic industrial heaters. These barriers are substantial, and minimizing them would do a disservice to both the complexity of the challenge and the seriousness with which industrial operators approach capital investment decisions.
The most immediate constraint is electrical grid capacity. A single large industrial RDH installation operating at 50 MW requires an electrical connection equivalent to powering a medium-sized town. A full cement plant or integrated steel mill might require 200–400 MW of continuous electrical supply — comparable to the output of a dedicated power plant. At current grid infrastructure levels, many industrial sites simply do not have access to this level of electrical capacity, and the transmission and distribution upgrades required to deliver it represent significant capital expenditure and planning timelines measured in years, not months.
The phased electrification approach — where partial conversion begins in low-grid-dependency applications while larger infrastructure upgrades proceed in parallel — is a pragmatic response to this constraint. Starting with holding furnaces, heat treatment operations, and secondary process heating allows operators to build operational experience with the technology and begin reducing emissions without waiting for full grid upgrades. As grid capacity expands and renewable generation continues to grow, the proportion of the plant that can be electrified increases incrementally.
A second practical consideration is the maturity of the supply chain for high-speed precision turbomachinery at industrial scale. The manufacturing base for equipment of this type exists primarily in the aerospace and power generation sectors. Building out a dedicated industrial rotodynamic equipment manufacturing capability — with the quality standards, lead times, and warranty structures that industrial operators demand — is itself a multi-year undertaking that will require deliberate investment and capacity planning.
Why This Technology Is Strategically Irreplaceable
The global climate challenge is not going to be solved by any single technology. But within the specific and enormously important problem space of high-temperature industrial heat, the rotodynamic approach occupies a position that no other currently available technology fully addresses. It is not in competition with green hydrogen — it is complementary to it, providing higher efficiency for applications where hydrogen's round-trip losses make it economically and energetically unattractive. It is not in competition with heat pumps — it serves an entirely different temperature regime. It does not require novel materials in the way that advanced high-temperature electrolysis does.
What it requires is electricity, precision engineering, and the intellectual will to apply 19th-century turbomachinery physics to a 21st-century problem. The first of those inputs is becoming cheaper and more abundant every year as the renewable energy transition accelerates. The second exists in abundance in the global aerospace and power generation industries. The third — the intellectual will — appears to be present in the Coolbrook engineering team, whose approach reflects exactly the kind of lateral thinking that breakthrough decarbonization technologies demand.
Steel, cement, aluminium, and chemicals are not optional industries. They are the physical substrate of economic development. Every road, every hospital, every wind turbine tower, every solar panel racking system requires these materials. Decarbonizing their production is not a lifestyle choice — it is a precondition for any credible path to net zero that does not depend on unproven negative-emission technologies at implausible scale.
Rotodynamic electrification does not solve every part of this challenge. It does not address the process CO₂ from limestone calcination in cement, which will ultimately require CCS or chemistry substitution regardless. It does not eliminate the need for grid expansion and renewable buildout. It does not replace the need for policy frameworks that put a meaningful price on carbon to create the investment incentive structures that will drive adoption. But for the very specific challenge of replacing fossil-fuel combustion as the source of extreme-temperature industrial heat, it represents the most energy-efficient, technically direct, and physically elegant solution currently on the table.
The history of energy transition is a history of engineering surprises — moments when a physics principle, long understood in the abstract, finds an application that changes the economics of an entire industry. The steam turbine was one such moment. The photovoltaic cell was another. Rotodynamic electrification may be standing at the beginning of such a moment for heavy industry.
The 2.4-gigaton prize is real. The physics is proven. The pilot is running. What happens next depends on whether the world's industrial operators, investors, and policymakers are prepared to act at the speed and scale the climate crisis demands. If they are, the rotodynamic heater may one day be remembered not as a clever technology, but as one of the pivotal instruments through which civilization decarbonized its hardest problem.
Rotodynamic technology uses a high-speed electric turbomachine to accelerate gas to supersonic velocities. When this gas encounters a diffuser section, shock waves form and then collapse, converting the kinetic energy of the moving gas into thermal energy with extraordinary speed and efficiency. The entire heating event occurs within milliseconds, and the process can reach temperatures approaching 1,700 °C without any combustion or fossil fuel input. The underlying physics — the thermodynamic relationships between velocity, pressure, and temperature in compressible gas flows — were codified in the 19th century but have never before been applied to deliberate, controllable industrial heat generation in this way.
Both technologies share the same core operating principle but serve different industrial purposes. The RotoDynamic Heater (RDH) is designed to electrify industrial process heating — it heats gases such as air, nitrogen, steam, or CO₂ and replaces the fossil-fuel burners in furnaces, kilns, and hot stoves. It scales above 50 MW and is designed for retrofit into existing plants. The RotoDynamic Reactor (RDR), by contrast, is designed to directly replace combustion-based chemical reactors. In petrochemical steam cracking, for example, the feedstock itself passes through the RDR, where the shock wave heating enables ultra-fast, precisely controlled temperature profiles that improve product yields, reduce coking, and eliminate combustion emissions simultaneously.
If deployed comprehensively across its addressable market in hard-to-abate industrial sectors, Coolbrook's rotodynamic technology has the potential to reduce global industrial CO₂ emissions by approximately 2.4 gigatons per year. This represents roughly 30% of all industrial emissions and approximately 7% of total global annual CO₂ output. In comparative terms, it is equivalent to eliminating the entire global aviation sector's annual footprint approximately three times over, or the combined emissions of Germany and France every single year.
The four primary target sectors are cement and lime production, the chemicals and petrochemicals industry (particularly steam cracking), iron and steel manufacturing, and aluminium production. Together, these sectors account for more than half of all global industrial energy consumption and roughly two-thirds of industrial CO₂ emissions. Beyond these headline sectors, the technology also has potential applications in glass manufacturing, paper and pulp production, and other industries with significant high-temperature heat requirements.
The RDH and RDR systems achieve electrical-to-heat conversion efficiency of approximately 90–95%. This makes them significantly more efficient than competing approaches for high-temperature industrial heat. Green hydrogen pathways — which involve electrolysis, compression, storage, transport, and combustion — typically deliver only 25–40% of the original electrical energy as useful heat. Electric resistance heating can achieve around 80% efficiency but struggles with material durability at extreme temperatures. The rotodynamic approach's high efficiency is particularly important because it directly affects the total renewable electricity capacity that must be built to power a decarbonized industrial sector.
Yes. Retrofit compatibility is a deliberate design priority for the RotoDynamic Heater. The technology is engineered to replace existing fossil-fuel burners in furnaces and kilns without requiring the wholesale replacement of surrounding plant infrastructure. This is critical for commercial adoption, since industrial operators cannot simply write off existing capital assets and rebuild from scratch. Phased electrification — where selected burners or heating stages are converted while others continue operating on fossil fuels during the transition — allows operators to begin reducing emissions and gaining operational experience with the technology while grid upgrades and capital cycles align.
As of 2025, the most prominent pilot installation is the RotoDynamic Reactor demonstration facility at the Brightlands Chemelot Campus in the Netherlands, adjacent to the Chemelot industrial complex — one of Western Europe's largest integrated chemical manufacturing sites. This pilot demonstrates the technology's application to steam cracking, the most energy-intensive process in petrochemical manufacturing. Coolbrook has also engaged with industrial partners in the cement and steel sectors, though the specific locations of those engagements have not all been publicly disclosed. The Chemelot pilot represents the most mature commercial demonstration currently operating.
The two most significant infrastructure challenges are electrical grid capacity and supply chain development. Large-scale RDH installations require 50–100 MW or more of continuous electrical supply per unit, and full plant electrification at a major cement works or steel mill could demand 200–400 MW — far exceeding the current grid connections available at most industrial sites. Expanding transmission and distribution infrastructure takes years and significant capital. The second challenge is building a dedicated manufacturing supply chain for high-speed precision industrial turbomachinery at the scale and cost points that industrial operators require. Both constraints are addressable but require coordinated investment across the public and private sectors, and neither can be resolved quickly.
