Installation year




Natural gas flow rate


 1.2-3.8 m3/h 

Electrical power


 2-9.5 kW

Thermal power


 8-26 kW

Electrical COP



Overall COP



Exhaust gases ΝΟ


 80-120 mg/m

Exhaust gases CΟ


 40-60 mg/m

The production of electricity from conventional sources contributes to the global climate change, degradation of life quality and other socioeconomic problems arising from the management of mineral resources. Specifically in Greece, an old, inefficient and polluting central power system is still used. Blackouts are common in summer, as a result of the great seasonal load imbalance with peak load during the summer tourist season.

The recent EU directives promote the upgrade of the existing electrical generation central systems to dispersed systems in which the renewable energy sources will have a dominant role. For the particular climatic conditions of Greece, the use of solar energy for the coupled heat and power generation may prove to be economically viable.

The combination of Stirling engines with solar concentrating collectors is a common method of cogeneration and trigeneration. Such solar systems are already installed and operate (50 kW in Saudi Arabia, 9 kW to 10 kW Germany and Spain).

The Laboratory of Applied Thermodynamics NTUA has installed a Stirling engine for research activities. The power of this unit is combined with natural gas and its products are electricity and heat. A commercial application of this machine would sell the electricity to the grid and would use the heat to cover its own heating / cooling demand.