The original kinematic Stirling machine, developed over 200 years ago by Rev. Robert Stirling, did not attain significant technical or commercial success until the latter half of the 20th century.

Why Stirling Engines require less maintenance
The principal “Stirling advantage” is that it is a closed-cycle external combustion engine, meaning the heat source is outside the engine. The inside of the Stirling engine can be sealed and designed for very long-term service intervals as the internals are not polluted the way internal combustion engines are. An increased focus on this technology over the last 50 years led to substantial recent breakthroughs in terms of operating concepts and supporting technologies

PowerGen uses a Stirling engine, specifically, an innovative variant called the Free Piston Stirling Engine (FPSE).

Qnergy introduced additional proprietary designs which capitalize on the fundamental architectural reliability of the FPSE. By using a novel heat exchanger designs within the harmonically resonating thermo-mechanical structure.

Thermal electric generators transform heat into electricity directly by using linear alternators. Qnergy’s design breakthroughs have resulted in an extremely reliable, long-life, maintenance-free, and quiet electricity generating platform. The FPSE generators, when heated at their absorber, transform any flow of heat into a steady output of electricity. These same generators are packaged into PowerGen’s energy products, these make use of multiple types of fuels to generate grid-quality electric power.

Stirling engines also make use of a regenerative heat exchanger that allows them to re-use their heat. This regeneration feature is what makes the Stirling cycle efficient, in addition to allowing it at the same time to be powered by virtually a broad range of gas heat values.

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