About Regensys Alpha
Regensys Ltd. is a UK-based clean-energy engineering company advancing Stirling-based systems for cryogenic cooling, hydrogen liquefaction, heat-to-power conversion, and thermal energy storage.
The Regensys Alpha Innovation
The Regensys Alpha system is an alpha-type free-piston Stirling architecture with multiple dynamically balanced cylinders in a double-acting configuration.
This design delivers high thermodynamic efficiency, low vibration, and precise control of both cooling and power outputs.
Key Features
Cryogenic Cooling: Achieves temperatures down to 25–150 K for hydrogen, nitrogen, or air liquefaction and storage.
Heat-to-Power Conversion: Converts industrial and renewable heat streams into electricity or cooling.
Cryogenic & Thermal Energy Storage: Supports LAES and thermal reservoirs.
Oil-Free & Hermetic: Minimal maintenance and long service life.
Modular Scalability: 10–30 kWth per module; arrayable to multi-megawatt systems.
High Efficiency: Up to 15% reduction in energy losses for small-scale distributed systems.
Traditional Alpha Stirling
In a conventional multicylinder, double-acting alpha-type Stirling engine, each cylinder alternates between heating and cooling as the working gas moves through regenerators and heat exchangers arranged in a loop.
When the gas is heated, it expands and pushes a piston; when it cools, it contracts and pulls the piston back. A crankshaft coordinates this motion, producing rotational output. Regenerators recover and reuse heat between cycles, improving efficiency.
This is a proven architecture known for strong performance, but it still relies on rotating machinery, bearings, lubrication, and precision thermal isolation within each cylinder
Regensys Alpha Stirling
The Regensys Alpha system uses the same high-efficiency Stirling thermodynamic cycle, but replaces the crankshaft and rotating parts with a free-piston, linear-motion architecture.
Each piston operates within a double-acting cylinder, and two pistons are linked to form a paired piston assembly. The hot side of each cylinder connects through a regenerator and heat exchangers to the cold side of the next, forming a continuous, synchronized thermal loop. At least four piston assemblies are interconnected to form multiple self,synchronised and highly efficient thermodynamic cycles.
The pistons move naturally in response to changing internal gas pressure — no gears, bearings, or lubrication required.
Key Advantages of Regensys Alpha
Free Piston, No Wear Components
No crankshaft, no bearings, no oil, and no sliding side forces → long life, low maintenance, high reliability.
True Thermal Separation
Each cylinder is either all hot or all cold, eliminating the complex thermal barriers needed in traditional Stirling engines and improving efficiency.
High Pressure Capability
Because there are no rotating shafts penetrating the pressure vessel, the system can be fully sealed and highly pressurized, increasing power density and reducing system size.
Mechanically Simple & Low Noise
The architecture removes most mechanical complexity, resulting in quiet operation and minimal servicing.
Vibration-Free Operation
Each piston assembly uses a back-to-back opposed configuration, meaning piston forces cancel each other out. This produces zero net vibration, enabling deployment in buildings, vehicles, remote sites, and sensitive industrial environments.
Modular and Scalable Power Output
Multiple synchronized thermodynamic units allow compact systems ranging from kilowatts to multi-megawatt scale, without redesigning core components
In Short
The Regensys Alpha system delivers the proven efficiency of Stirling thermodynamics with a clean, quiet, vibration-free, and maintenance-minimal design. By eliminating rotating machinery and simplifying thermal management, Regensys makes high-performance clean power practical, scalable, and highly reliable.