Consumer-oriented and sustainable production of electricity and heat play a major role not only in the private sector. Also in the larger power range is increasingly set to the on-site production of energy-efficient and simultaneous production of electricity and heat.
For this reason the project "Pellematic e-max - the electricity generating pellets heating for the medium power range" has been started with the goal to supply larger buildings with a high heat demand, with electricity and heat from pellets.
PELLET HEATING WITH STIRLING ENGINE (Pellematic e-max)
Structure of the electricity generating pellet heating
To integrate the Qnergy Stirling engine an own pellet boiler was designed which should gradually be adapted to the needs of the stirling engine. This pellet boiler has roughly a thermal output of 50 kW while providing an electrical output of about 4-5 kW.
Advantages of the Project Pellematic e-max:
- Energy-efficient heat and electricity generation at the place of use
- Low emission and ecological: CO2-neutral energy balance for heat and electricity
- As base load : long, continuous runtimes and thereby a predictable energy yield
- Short payback time at optimum use and long run-times
QNERGY STIRLING ENGINE
The hermetically sealed free-piston Stirling engine of the company Qnergy works with helium as driving gas. The heat supplied from the wood pellets leads to a piston movement in the interior of the Stirling engine. This allows up to 5 kW of electrical power, completely maintenance-free and environmentally friendly. Depending of the heat supply or the temperature in the combuston chamber, the Stirling engine modulates ist electric capacity and adapts to the requirements.
The produced electric power needs to be rectified. The conversion of DC to AC (50 Hz) and the later three-phase feed into the public grid is carried out by an inverter from the company Fronius.
How it works
1. The head of the Stirling engine is heated with the flame of the wood pellets. This heat is then transferred to the working fluid of the Stirling engine (helium). This heating leads to a pressure increase.
2. With the heat supply and the cooling of the Stirling engine in the cooling circuit, a temperature and pressure difference is generated. Through this temperature difference, the helium in the Stirling engine expands and contracts again and thereby, the piston is set in motion and moves up and down.
3. This movement is converted by the linear generator directly inside the Stirling engine into electrical energy.
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MILESTONES IN THE DEVELOPMENT OF Pellematic e-max
Also for the development of the project Pellematic e-max two specialists in their fields have joined their forces with the goal to achieve something big: the tried and tested a thousand times ÖkoFEN pellet heating technology meets the Qnergy Stirling engine to develop together within the project Pellematic e-max, a wood pellet power station for the medium performance range.
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