The Stirling engine is an almost 200 year old invention, but it is only now with today's technology that it can become a commercial product for a wide customer base.
It fits as well in the villa as a source of energy for heat and electricity as in industrial or commercial contexts.
By adjusting the size, taking as much energy as possible and having a high efficiency heating source, you get these benefits:
- The Stirling engine fits most installations from a standard villa up to industry and community.
- by utilizing both electricity and heat, you get a very high efficiency - over 90%.
- Many different heat sources can be used for the same engine. Solar energy, heating through combustion of pellets or different types of gas.
- through a customized combustion of pellets or gas, low emissions are obtained, about 20% of what a modern car releases, this without catalyst or other purification methods. With the sun as heat source, the emissions will be zero.
The ordinary combution engine
In a ordinary combution engine, fuel is fed into the engine where there is a combustion that creates the movement, the rotation, which can then be used to drive the car forward or generate electricity via a generator. Internal combustion occurs in these engines.
The internal parts and bearings of the engine are exposed to combustion and its contamination, which affects service life and necessitates service often.
Oil change etc after 150-250 hours of operation is common. In a 24-hour engine installation service will be 2-3 times a month.
In a Stirling engine there is a working gas, in this case nitrogen, which is heated to expand and then cooled down to decrease in volume.
This volume increase / decrease is used to create motion and cause the engine to spin, the rotation.
The gas is heated by means of a heat exchanger that sits outside the engine and cools the gas by means of a cooling system.
To create heat for the heat exchanger, you can use the sun, a combustion of pellets or gas, etc. Anything that can give a temperature between 600-1000 ° C is basically useful.
The heating is done externally, outside the engine, which gives more advantages in addition to using different fuels for the same engine.
Stirling engine parts and bearings work in a clean environment, which means that service intervals on the engine will be long - 20,000 hours and lifetime approximately 100,000 hours. The engine is oil-free.
20,000 operating hours in a villain installation correspond to just over 10 years. Array and control of working gas occur annually.