The Ericsson engine is an External Combustion engine (EC engine), also known as an hot air engine. Its first use dates from the 19th century for a naval propulsion application.

This thermal machine operates between two heat sources external to the engine via heat exchangers. It uses valves to control the flow of the working fluid (gaseous phase) between two chambers, one compression chamber and the other expansion chamber.

With theoretical performances superior to the Stirling engine, the new bricks technologies of the 21st century generate renewed interest in it by simplifying its realization.

These applications associated with the energy transition are numerous, thanks to its ability to valorize thermal waste to convert it into a mechanical movement, and thus produce electricity.

The innovation of our product is based on its ability to modify its displacement according to the load or the available thermal power. In addition, this EC engine uses metal bellows instead of piston-cylinder assemblies in “traditional” engines. In addition to the advantages associated with mechanical losses and tightness, this new concept eliminates the need for any lubrication system and allows internal volumes (the engine’s “displacement”) to be varied online, while retaining the possibility of modifying the thermodynamic cycle. This results in high engine efficiency and reduces the price per installed kilowatt.