Technology group Wärtsilä is part of a new research project exploring innovative technology for cleaner, more energy-efficient engines utilizing a closed loop combustion cycle. The research will focus on the use of argon – a non-toxic ideal gas present in the atmosphere – to increase efficiency of balancing engines. The co-innovation project is run by the Integrated H₂-Argon Power Cycle (iHAPC) consortium, led by the University of Vaasa, in partnership with Business Finland and a wide network of partners.

In an internal combustion engine, the energy supplied by combusting fuel is directly converted into mechanical power by the controlled combustion of the fuel in an enclosed space. In the Argon Power Cycle, air, which is normally used to combust the fuel in an internal combustion engine, is now replaced by argon and oxygen. The research focuses on scaling up the Argon Power Cycle to medium speed engines with full argon recovery. Argon enables a considerably higher thermodynamic efficiency due to its properties.

When using H₂, oxygen and argon as input the only product from the process is water and the inert argon. Argon is recycled from exhaust to inlet forming a closed loop combustion cycle. H₂ and oxygen, the only inputs in the integrated H₂ argon power cycle, are both products of electrolysis, which increases the overall efficiency of the power-to-H₂-to-power process.

Rasmus Teir, Director of Sustainability & Future Plant Concepts at Wärtsilä Energy said, "We have the technologies needed to deliver a 100% renewable energy future. And our ambition must be to continuously innovate solutions that further improve affordability and sustainability. The argon power cycle is an innovative technology that has the potential to impact these factors positively.”

Balancing engines are a vital component of the transition to renewable energy systems, providing essential power to balance intermittent wind and solar power and ensure grid stability. The most efficient engines run on gas today but are ready to be converted to sustainable fuels such as H₂ when they are available at scale. With sustainable fuel production forecast to reach 38 MMt by 2030 (a third more than current demand) this transition is expected to be possible within the next decade.

The three-year project is part of the Wide and Intelligent Sustainable Energy (WISE) program, led by Wärtsilä and funded by Business Finland, the official government agency for trade, investment promotion and innovation funding. The partners of the iHAPC project are University of Vaasa, University of Oulu, VTT Technical Research Centre of Finland, Parker Hannifin Manufacturing Finland Oy, Vahterus Oy, Vaisala Oyj and TotalEnergies.

Professor Maciej Mikulski from the University of Vaasa, the responsible leader of the iHAPC project, said, “The argon power cycle enables full valorization of green H₂ with unparalleled power generation efficiency. I see this as a potential breakthrough for the energy sector. The University of Vaasa plays a crucial role in advancing such innovative energy solutions with a strong focus on sustainability. With our expertise in fuel analytics, modelling and simulation, powertrain testing, and control development, we are well-equipped and excited to lead this project.”